Xunit2TheoryAcceptanceTests.cs

#if NETFRAMEWORK

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Xunit;
using Xunit.Abstractions;
using Xunit.Sdk;

public class Xunit2TheoryAcceptanceTests
{
    public class TheoryTests : AcceptanceTestV2
    {
        [Fact]
        public void OptionalParameters_Valid()
        {
            var results = Run<ITestResultMessage>(typeof(ClassWithOptionalParameters));

            Assert.Collection(results.Cast<ITestPassed>().OrderBy(r => r.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_OneNullParameter_NonePassed(s: null)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_OneNullParameter_OneNonNullPassed(s: ""abc"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_OneNullParameter_OneNullPassed(s: null)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_OneParameter_NonePassed(s: ""abc"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_OneParameter_OnePassed(s: ""def"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_TwoParameters_OnePassed(s: ""abc"", i: 5)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.OneOptional_TwoParameters_TwoPassed(s: ""abc"", i: 6)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.TwoOptional_TwoParameters_FirstOnePassed(s: ""def"", i: 5)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.TwoOptional_TwoParameters_NonePassed(s: ""abc"", i: 5)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.TwoOptional_TwoParameters_TwoPassedInOrder(s: ""def"", i: 6)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOptionalParameters.TwoOptionalAttributes_NonePassed(x: null, y: 0)", result.Test.DisplayName)
            );
        }

        public class ClassWithOptionalParameters
        {
            [Theory]
            [InlineData]
            public void OneOptional_OneParameter_NonePassed(string s = "abc")
            {
                Assert.Equal("abc", s);
            }

            [Theory]
            [InlineData("def")]
            public void OneOptional_OneParameter_OnePassed(string s = "abc")
            {
                Assert.Equal("def", s);
            }

            [Theory]
            [InlineData]
            public void OneOptional_OneNullParameter_NonePassed(string s = null)
            {
                Assert.Null(s);
            }

            [Theory]
            [InlineData("abc")]
            public void OneOptional_OneNullParameter_OneNonNullPassed(string s = null)
            {
                Assert.Equal("abc", s);
            }

            [Theory]
            [InlineData(null)]
            public void OneOptional_OneNullParameter_OneNullPassed(string s = null)
            {
                Assert.Null(s);
            }

            [Theory]
            [InlineData("abc")]
            public void OneOptional_TwoParameters_OnePassed(string s, int i = 5)
            {
                Assert.Equal("abc", s);
                Assert.Equal(5, i);
            }

            [Theory]
            [InlineData("abc", 6)]
            public void OneOptional_TwoParameters_TwoPassed(string s, int i = 5)
            {
                Assert.Equal("abc", s);
                Assert.Equal(6, i);
            }

            [Theory]
            [InlineData]
            public void TwoOptional_TwoParameters_NonePassed(string s = "abc", int i = 5)
            {
                Assert.Equal("abc", s);
                Assert.Equal(5, i);
            }

            [Theory]
            [InlineData("def")]
            public void TwoOptional_TwoParameters_FirstOnePassed(string s = "abc", int i = 5)
            {
                Assert.Equal("def", s);
                Assert.Equal(5, i);
            }

            [Theory]
            [InlineData("def", 6)]
            public void TwoOptional_TwoParameters_TwoPassedInOrder(string s = "abc", int i = 5)
            {
                Assert.Equal("def", s);
                Assert.Equal(6, i);
            }

            [Theory]
            [InlineData()]
            public void TwoOptionalAttributes_NonePassed([Optional] object x, [Optional] int y)
            {
                Assert.Null(x);
                Assert.Equal(0, y);
            }
        }

        [Fact]
        public void ParamsParameters_Valid()
        {
            var results = Run<ITestResultMessage>(typeof(ClassWithParamsParameters));

            Assert.Collection(results.Cast<ITestPassed>().OrderBy(r => r.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_ManyPassed(array: [1, 2, 3, 4, 5, ...])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_NonePassed(array: [])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_OnePassed_MatchingArray(array: [1])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_OnePassed_NonArray(array: [1])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_OnePassed_NonMatchingArray(array: [[1]])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OneParameter_OnePassed_Null(array: null)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OptionalParameters_ManyPassed(s: ""def"", i: 2, array: [3, 4, 5])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.OptionalParameters_NonePassed(s: ""abc"", i: 1, array: [])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_ManyPassed(i: 1, array: [2, 3, 4, 5, 6])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_NullPassed(i: 1, array: null)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_OnePassed(i: 1, array: [])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_OnePassed_MatchingArray(i: 1, array: [2])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_OnePassed_NonArray(i: 1, array: [2])", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithParamsParameters.TwoParameters_OnePassed_NonMatchingArray(i: 1, array: [[2]])", result.Test.DisplayName)
            );
        }

        public class ClassWithParamsParameters
        {
            [Theory]
            [InlineData]
            public void OneParameter_NonePassed(params object[] array)
            {
                Assert.Empty(array);
            }

            [Theory]
            [InlineData(null)]
            public void OneParameter_OnePassed_Null(params object[] array)
            {
                Assert.Null(array);
            }

            [Theory]
            [InlineData(1)]
            public void OneParameter_OnePassed_NonArray(params object[] array)
            {
                Assert.Equal(new object[] { 1 }, array);
            }

            [Theory]
            [InlineData(new object[] { new object[] { 1 } })]
            public void OneParameter_OnePassed_MatchingArray(params object[] array)
            {
                Assert.Equal(new object[] { 1 }, array);
            }

            [Theory]
            [InlineData(new int[] { 1 })]
            public void OneParameter_OnePassed_NonMatchingArray(params object[] array)
            {
                Assert.Equal(new object[] { new int[] { 1 } }, array);
            }

            [Theory]
            [InlineData(1, 2, 3, 4, 5, 6)]
            public void OneParameter_ManyPassed(params object[] array)
            {
                Assert.Equal(new object[] { 1, 2, 3, 4, 5, 6 }, array);
            }

            [Theory]
            [InlineData(1)]
            public void TwoParameters_OnePassed(int i, params object[] array)
            {
                Assert.Equal(1, i);
                Assert.Empty(array);
            }

            [Theory]
            [InlineData(1, null)]
            public void TwoParameters_NullPassed(int i, params object[] array)
            {
                Assert.Equal(1, i);
                Assert.Null(array);
            }

            [Theory]
            [InlineData(1, 2)]
            public void TwoParameters_OnePassed_NonArray(int i, params object[] array)
            {
                Assert.Equal(1, i);
                Assert.Equal(new object[] { 2 }, array);
            }

            [Theory]
            [InlineData(1, new object[] { 2 })]
            public void TwoParameters_OnePassed_MatchingArray(int i, params object[] array)
            {
                Assert.Equal(1, i);
                Assert.Equal(new object[] { 2 }, array);
            }

            [Theory]
            [InlineData(1, new int[] { 2 })]
            public void TwoParameters_OnePassed_NonMatchingArray(int i, params object[] array)
            {
                Assert.Equal(1, i);
                Assert.Equal(new object[] { new int[] { 2 } }, array);
            }

            [Theory]
            [InlineData(1, 2, 3, 4, 5, 6)]
            public void TwoParameters_ManyPassed(int i, params object[] array)
            {
                Assert.Equal(i, 1);
                Assert.Equal(new object[] { 2, 3, 4, 5, 6 }, array);
            }

            [Theory]
            [InlineData]
            public void OptionalParameters_NonePassed(string s = "abc", int i = 1, params object[] array)
            {
                Assert.Equal("abc", s);
                Assert.Equal(1, i);
                Assert.Empty(array);
            }

            [Theory]
            [InlineData("def", 2, 3, 4, 5)]
            public void OptionalParameters_ManyPassed(string s = "abc", int i = 1, params object[] array)
            {
                Assert.Equal("def", s);
                Assert.Equal(2, i);
                Assert.Equal(new object[] { 3, 4, 5 }, array);
            }
        }

        [Fact]
        public void ImplicitExplicitConversions()
        {
            var results = Run<ITestResultMessage>(typeof(ClassWithOperatorConversions));

            Assert.Collection(results.Cast<ITestPassed>().OrderBy(r => r.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.ArgumentDeclaredExplicitConversion(value: ""abc"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.ArgumentDeclaredImplicitConversion(value: ""abc"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.DecimalToInt(value: 43)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.IntToDecimal(value: 43)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.IntToLong(i: 1)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.ParameterDeclaredExplicitConversion(e: Explicit { Value = ""abc"" })", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.ParameterDeclaredImplicitConversion(i: Implicit { Value = ""abc"" })", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithOperatorConversions.UIntToULong(i: 1)", result.Test.DisplayName)
            );
        }

        public class ClassWithOperatorConversions
        {
            // Explicit conversion defined on the parameter's type
            [Theory]
            [InlineData("abc")]
            public void ParameterDeclaredExplicitConversion(Explicit e)
            {
                Assert.Equal("abc", e.Value);
            }

            // Implicit conversion defined on the parameter's type
            [Theory]
            [InlineData("abc")]
            public void ParameterDeclaredImplicitConversion(Implicit i)
            {
                Assert.Equal("abc", i.Value);
            }

            public static IEnumerable<object[]> ExplicitArgument =
                new[] { new[] { new Explicit { Value = "abc" } } };

            // Explicit conversion defined on the argument's type
            [Theory]
            [MemberData(nameof(ExplicitArgument))]
            public void ArgumentDeclaredExplicitConversion(string value)
            {
                Assert.Equal("abc", value);
            }

            public static IEnumerable<object[]> ImplicitArgument =
                new[] { new[] { new Implicit { Value = "abc" } } };

            // Implicit conversion defined on the argument's type
            [Theory]
            [MemberData(nameof(ImplicitArgument))]
            public void ArgumentDeclaredImplicitConversion(string value)
            {
                Assert.Equal("abc", value);
            }

            [Theory]
            [InlineData(1)]
            public void IntToLong(long i)
            {
                Assert.Equal(1L, i);
            }

            [Theory]
            [InlineData((uint)1)]
            public void UIntToULong(ulong i)
            {
                Assert.Equal(1UL, i);
            }

            public static IEnumerable<object[]> DecimalArgument()
            {
                yield return new object[] { 43M };
            }

            // Decimal type offers multiple explicit conversions
            [Theory]
            [MemberData(nameof(DecimalArgument))]
            public void DecimalToInt(int value)
            {
                Assert.Equal(43, value);
            }

            // Decimal type offers multiple implicit conversions
            [Theory]
            [InlineData(43)]
            public void IntToDecimal(decimal value)
            {
                Assert.Equal(43M, value);
            }

            public class Explicit
            {
                public string Value { get; set; }

                public static explicit operator Explicit(string value)
                {
                    return new Explicit() { Value = value };
                }

                public static explicit operator string(Explicit e)
                {
                    return e.Value;
                }
            }

            public class Implicit
            {
                public string Value { get; set; }

                public static implicit operator Implicit(string value)
                {
                    return new Implicit() { Value = value };
                }

                public static implicit operator string(Implicit i)
                {
                    return i.Value;
                }
            }
        }

        [Fact]
        public void GenericParameter_Func_Valid()
        {
            var results = Run<ITestResultMessage>(typeof(ClassWithFuncMethod));

            Assert.Collection(results.Cast<ITestPassed>().OrderBy(r => r.Test.DisplayName),
                result => Assert.StartsWith("Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Double>(source: [4, 5, 6, 7], ", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Int32>(source: [4, 5, 6, 7]", result.Test.DisplayName),
                result => Assert.StartsWith(@"Xunit2TheoryAcceptanceTests+TheoryTests+ClassWithFuncMethod.TestMethod<Single>(source: [4, 5, 6, 7]", result.Test.DisplayName)
            );
        }

        internal class ClassWithFuncMethod
        {
            public static IEnumerable<object[]> TestData()
            {
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, float>(i => i + 0.5f) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, double>(i => i + 0.5d) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i * 2) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i + 1) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i) };
                yield return new object[] { new[] { 4, 5, 6, 7 }, new Func<int, int>(i => i) };
            }

            [Theory]
            [MemberData(nameof(TestData))]
            public void TestMethod<TResult>(IEnumerable<int> source, Func<int, TResult> selector)
            {
            }
        }

        [Fact]
        public void Skipped()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTest));

            var skipped = Assert.Single(testMessages.Cast<ITestSkipped>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+TheoryTests+ClassUnderTest.TestViaInlineData", skipped.Test.DisplayName);
            Assert.Equal("Don't run this!", skipped.Reason);
        }

        class ClassUnderTest
        {
            [Theory(Skip = "Don't run this!")]
            [InlineData(42, 21.12, "Hello, world!")]
            [InlineData(0, 0.0, null)]
            public void TestViaInlineData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void GenericTheoryWithSerializableData()
        {
            var results = Run<ITestResultMessage>(typeof(GenericWithSerializableData));

            Assert.Collection(results.OfType<ITestPassed>().Select(p => p.Test.DisplayName).OrderBy(x => x),
                // Embedded (T1, Empty<T2>)
                displayName => Assert.Equal("Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Embedded<Int32, Int32>(value: 1, value2: Empty<Int32>)", displayName),
                displayName => Assert.Equal("Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Embedded<Object, Int32>(value: null, value2: Empty<Int32>)", displayName),
                displayName => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Embedded<String, Int32>(value: ""1"", value2: Empty<Int32>)", displayName),
                // Simple (T1, T2)
                displayName => Assert.Equal("Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Simple<Int32, Object>(value1: 42, value2: null)", displayName),
                displayName => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Simple<Int32[], List<String>>(value1: [1, 2, 3], value2: [""a"", ""b"", ""c""])", displayName),
                displayName => Assert.Equal("Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Simple<Object, Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData+Empty<Int32>>(value1: null, value2: Empty<Int32>)", displayName),
                displayName => Assert.Equal($@"Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithSerializableData.GenericTest_Simple<String, Double>(value1: ""Hello, world!"", value2: {21.12:G17})", displayName)
            );
        }

        class GenericWithSerializableData
        {
            public static IEnumerable<object[]> GenericData_Embedded()
            {
                yield return new object[] { 1, default(Empty<int>) };
                yield return new object[] { "1", default(Empty<int>) };
                yield return new object[] { null, default(Empty<int>) };
            }

            [Theory, MemberData(nameof(GenericData_Embedded))]
            public void GenericTest_Embedded<T1, T2>(T1 value, Empty<T2> value2) { }

            public struct Empty<T>
            {
                public override string ToString() => $"Empty<{typeof(T).Name}>";
            }

            public static IEnumerable<object[]> GenericData_Simple
            {
                get
                {
                    yield return new object[] { 42, null };
                    yield return new object[] { "Hello, world!", 21.12 };
                    yield return new object[] { new int[] { 1, 2, 3 }, new List<string> { "a", "b", "c" } };
                    yield return new object[] { null, default(Empty<int>) };
                }
            }

            [Theory, MemberData(nameof(GenericData_Simple))]
            public void GenericTest_Simple<T1, T2>(T1 value1, T2 value2) { }
        }

        [Fact]
        public void GenericTheoryWithNonSerializableData()
        {
            var results = Run<ITestResultMessage>(typeof(GenericWithNonSerializableData));

            Assert.Collection(results.Cast<ITestPassed>(),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithNonSerializableData.GenericTest<Xunit2TheoryAcceptanceTests+TheoryTests+GenericWithNonSerializableData>(value: GenericWithNonSerializableData { })", result.Test.DisplayName)
            );
        }

        public class GenericWithNonSerializableData
        {
            public static IEnumerable<object[]> GenericData
            {
                get
                {
                    yield return new object[] { new GenericWithNonSerializableData() };
                }
            }

            [Theory, MemberData("GenericData")]
            public void GenericTest<T>(T value) { }
        }
    }

    public class InlineDataTests : AcceptanceTestV2
    {
        [Fact]
        public void RunsForEachDataElement()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTest));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+InlineDataTests+ClassUnderTest.TestViaInlineData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassUnderTest.TestViaInlineData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassUnderTest
        {
            [Theory]
            [InlineData(42, 21.12, "Hello, world!")]
            [InlineData(0, 0.0, null)]
            public void TestViaInlineData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void SingleNullValuesWork()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTestForNullValues));

            var passing = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassUnderTestForNullValues.TestMethod(value: null)", passing.Test.DisplayName);
        }

        class ClassUnderTestForNullValues
        {
            [Theory]
            [InlineData(null)]
            public void TestMethod(string value) { }
        }

        [Fact]
        public void ArraysWork()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTestForArrays));

            var passing = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Contains("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassUnderTestForArrays.TestMethod", passing.Test.DisplayName);
        }

        class ClassUnderTestForArrays
        {
            [Theory]
            [InlineData(new[] { 42, 2112 }, new[] { "SELF", "PARENT1", "PARENT2", "PARENT3" }, null, 10.5, "Hello, world!")]
            public void TestMethod(int[] v1, string[] v2, float[] v3, double v4, string v5) { }
        }

        [Fact]
        public void ValueArraysWithObjectParameterInjectCorrectType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTestForValueArraysWithObjectParameter));

            var passing = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Contains("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassUnderTestForValueArraysWithObjectParameter.TestMethod", passing.Test.DisplayName);
        }

        class ClassUnderTestForValueArraysWithObjectParameter
        {
            [Theory]
            [InlineData(new[] { 42, 2112 }, typeof(int[]))]
            public void TestMethod(object value, Type expected)
            {
                Assert.IsType(expected, value);
            }
        }

        [Fact]
        public void AsyncTaskMethod_MultipleInlineDataAttributes()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithAsyncTaskMethod));

            var passed = testMessages.Cast<ITestPassed>().OrderBy(t => t.Test.DisplayName).ToArray();
            Assert.Equal("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassWithAsyncTaskMethod.TestMethod(x: A)", passed[0].Test.DisplayName);
            Assert.Equal("Xunit2TheoryAcceptanceTests+InlineDataTests+ClassWithAsyncTaskMethod.TestMethod(x: B)", passed[1].Test.DisplayName);
        }

        enum SomeEnum
        {
            A, B
        }

        class ClassWithAsyncTaskMethod
        {
            [Theory]
            [InlineData(SomeEnum.A)]
            [InlineData(SomeEnum.B)]
            async Task TestMethod(SomeEnum x)
            {
                await Task.Run(() => "Any statement, to prevent a C# compiler error");
            }
        }
    }

    public class ClassDataTests : AcceptanceTestV2
    {
        [Fact]
        public void RunsForEachDataElement()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassUnderTest));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+ClassDataTests+ClassUnderTest.TestViaClassData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+ClassDataTests+ClassUnderTest.TestViaClassData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassUnderTest
        {
            [Theory]
            [ClassData(typeof(ClassDataSource))]
            public void TestViaClassData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        class ClassDataSource : IEnumerable<object[]>
        {
            public IEnumerator<object[]> GetEnumerator()
            {
                yield return new object[] { 42, 21.12, "Hello, world!" };
                yield return new object[] { 0, 0.0, null };
            }

            IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
        }

        [Fact]
        public void NoDefaultConstructor_Fails()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassNotImplementingIEnumerable));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+ClassDataTests+ClassNotImplementingIEnumerable.TestMethod", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Xunit2TheoryAcceptanceTests+ClassDataTests+ClassNotImplementingIEnumerable must implement IEnumerable<object[]> to be used as ClassData for the test method named 'TestMethod' on Xunit2TheoryAcceptanceTests+ClassDataTests+ClassNotImplementingIEnumerable", failed.Messages.Single());
        }

        class ClassNotImplementingIEnumerable
        {
            [Theory]
            [ClassData(typeof(ClassNotImplementingIEnumerable))]
            public void TestMethod() { }
        }
    }

    public class MissingDataTests : AcceptanceTestV2
    {
        [Fact]
        public void MissingDataThrows()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithMissingData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MissingDataTests+ClassWithMissingData.TestViaMissingData", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Could not find public static member (property, field, or method) named 'Foo' on Xunit2TheoryAcceptanceTests+MissingDataTests+ClassWithMissingData", failed.Messages.Single());
        }

        class ClassWithMissingData
        {
            [Theory]
            [MemberData("Foo")]
            public void TestViaMissingData(int x, double y, string z) { }
        }
    }

    public class DataConversionTests : AcceptanceTestV2
    {
        [Fact]
        public void IncompatibleDataThrows()
        {
            CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;

            var testMessages = Run<ITestResultMessage>(typeof(ClassWithIncompatibleData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal(@"Xunit2TheoryAcceptanceTests+DataConversionTests+ClassWithIncompatibleData.TestViaIncompatibleData(x: ""Foo"")", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Object of type 'System.String' cannot be converted to type 'System.Int32'.", failed.Messages.Single());
        }

        class ClassWithIncompatibleData
        {
            [Theory]
            [InlineData("Foo")]
            public void TestViaIncompatibleData(int x) { }
        }

        [Fact]
        public void ImplicitlyConvertibleDataPasses()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithImplicitlyConvertibleData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal(@"Xunit2TheoryAcceptanceTests+DataConversionTests+ClassWithImplicitlyConvertibleData.TestViaImplicitData(x: 42)", passed.Test.DisplayName);
        }

        class ClassWithImplicitlyConvertibleData
        {
            [Theory]
            [InlineData(42)]
            public void TestViaImplicitData(int? x) { }
        }

        [Fact]
        public void IConvertibleDataPasses()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithIConvertibleData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal(@"Xunit2TheoryAcceptanceTests+DataConversionTests+ClassWithIConvertibleData.TestViaIConvertible(x: 42)", passed.Test.DisplayName);
        }

        class MyConvertible : IConvertible
        {
            public TypeCode GetTypeCode()
            {
                return TypeCode.Int32;
            }

            public int ToInt32(IFormatProvider provider)
            {
                return 42;
            }

#region Noise

            public bool ToBoolean(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public byte ToByte(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public char ToChar(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public DateTime ToDateTime(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public decimal ToDecimal(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public double ToDouble(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public short ToInt16(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public long ToInt64(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public sbyte ToSByte(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public float ToSingle(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public string ToString(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public object ToType(Type conversionType, IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public ushort ToUInt16(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public uint ToUInt32(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

            public ulong ToUInt64(IFormatProvider provider)
            {
                throw new InvalidCastException();
            }

#endregion
        }

        class ClassWithIConvertibleData
        {
            public static IEnumerable<object[]> Data = new TheoryData<MyConvertible> { new MyConvertible() };

            [Theory]
            [MemberData("Data")]
            public void TestViaIConvertible(int x) { }
        }
    }

    public class FieldDataTests : AcceptanceTestV2
    {
        [Fact]
        public void RunsForEachDataElement()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithSelfFieldData));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+FieldDataTests+ClassWithSelfFieldData.TestViaFieldData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+FieldDataTests+ClassWithSelfFieldData.TestViaFieldData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithSelfFieldData
        {
            public static IEnumerable<object[]> DataSource = new[] {
                new object[] { 42, 21.12, "Hello, world!" },
                new object[] { 0, 0.0, null }
            };

            [Theory]
            [MemberData("DataSource")]
            public void TestViaFieldData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void CanUseFieldDataFromOtherClass()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithImportedFieldData));

            Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithImportedFieldData
        {
            [Theory]
            [MemberData("DataSource", MemberType = typeof(ClassWithSelfFieldData))]
            public void TestViaFieldData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void NonStaticFieldDataThrows()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithNonStaticFieldData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+FieldDataTests+ClassWithNonStaticFieldData.TestViaFieldData", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Could not find public static member (property, field, or method) named 'DataSource' on Xunit2TheoryAcceptanceTests+FieldDataTests+ClassWithNonStaticFieldData", failed.Messages.Single());
        }

        class ClassWithNonStaticFieldData
        {
            public IEnumerable<object[]> DataSource = null;

            [Theory]
            [MemberData("DataSource")]
            public void TestViaFieldData(int x, double y, string z) { }
        }

        [Fact]
        public void CanUseFieldDataFromBaseType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithBaseClassData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+FieldDataTests+ClassWithBaseClassData.TestViaFieldData(x: 42)", passed.Test.DisplayName);
        }

        class BaseClass
        {
            public static IEnumerable<object[]> DataSource = new[] { new object[] { 42 } };
        }

        class ClassWithBaseClassData : BaseClass
        {
            [Theory]
            [MemberData("DataSource")]
            public void TestViaFieldData(int x) { }
        }
    }

    public class MethodDataTests : AcceptanceTestV2
    {
        [Fact]
        public void RunsForEachDataElement()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithSelfMethodData));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithSelfMethodData.TestViaMethodData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithSelfMethodData.TestViaMethodData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithSelfMethodData
        {
            public static IEnumerable<object[]> DataSource()
            {
                return new[] {
                    new object[] { 42, 21.12, "Hello, world!" },
                    new object[] { 0, 0.0, null }
                };
            }

            [Theory]
            [MemberData("DataSource")]
            public void TestViaMethodData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void CanUseMethodDataFromOtherClass()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithImportedMethodData));

            Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithImportedMethodData
        {
            [Theory]
            [MemberData("DataSource", MemberType = typeof(ClassWithSelfMethodData))]
            public void TestViaMethodData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void NonStaticMethodDataThrows()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithNonStaticMethodData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithNonStaticMethodData.TestViaMethodData", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Could not find public static member (property, field, or method) named 'DataSource' on Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithNonStaticMethodData", failed.Messages.Single());
        }

        class ClassWithNonStaticMethodData
        {
            public IEnumerable<object[]> DataSource() => null;

            [Theory]
            [MemberData("DataSource")]
            public void TestViaMethodData(int x, double y, string z) { }
        }

        [Fact]
        public void NonMatchingMethodInputDataThrows()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithMismatchedMethodData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithMismatchedMethodData.TestViaMethodData", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Could not find public static member (property, field, or method) named 'DataSource' on Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithMismatchedMethodData with parameter types: System.Double", failed.Messages.Single());
        }

        class ClassWithMismatchedMethodData
        {
            public static IEnumerable<object[]> DataSource(int x) => null;

            [Theory]
            [MemberData("DataSource", 21.12)]
            public void TestViaMethodData(int x, double y, string z) { }
        }

        [Fact]
        public void CanDowncastMethodData()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithDowncastedMethodData));

            Assert.True(testMessages.All(m => m is ITestPassed));
        }

        class ClassWithDowncastedMethodData
        {
            public static IEnumerable<object[]> DataSource(object x, string y) { yield return new object[] { 42, 21.12, "Hello world" }; }

            [Theory]
            [MemberData("DataSource", 42, "Hello world")]
            [MemberData("DataSource", 21.12, null)]
            public void TestViaMethodData(int x, double y, string z) { }
        }

        [Fact]
        public void CanUseMethodDataFromBaseType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithBaseClassData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithBaseClassData.TestViaMethodData(x: 42)", passed.Test.DisplayName);
        }

        class BaseClass
        {
            public static IEnumerable<object[]> DataSource()
            {
                return new[] { new object[] { 42 } };
            }
        }

        class ClassWithBaseClassData : BaseClass
        {
            [Theory]
            [MemberData("DataSource")]
            public void TestViaMethodData(int x) { }
        }

        [Fact]
        public void CanUseMethodDataInSubTypeFromTestInBaseType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(SubClassWithTestData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+SubClassWithTestData.Test(x: 42)", passed.Test.DisplayName);
        }

        public abstract class BaseClassWithTestWithoutData
        {
            [Theory]
            [MemberData("TestData")]
            public void Test(int x)
            {
                Assert.Equal(42, x);
            }
        }

        public class SubClassWithTestData : BaseClassWithTestWithoutData
        {
            public static IEnumerable<object[]> TestData()
            {
                yield return new object[] { 42 };
            }
        }

        [Fact]
        public void SubTypeInheritsTestsFromBaseType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(SubClassWithNoTests));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+SubClassWithNoTests.Test(x: 42)", passed.Test.DisplayName);
        }

        public abstract class BaseClassWithTestAndData
        {
            public static IEnumerable<object[]> TestData()
            {
                yield return new object[] { 42 };
            }

            [Theory]
            [MemberData("TestData")]
            public void Test(int x)
            {
                Assert.Equal(42, x);
            }
        }

        public class SubClassWithNoTests : BaseClassWithTestAndData { }

        [Fact]
        public void CanPassParametersToDataMethod()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithParameterizedMethodData));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithParameterizedMethodData.TestViaMethodData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+MethodDataTests+ClassWithParameterizedMethodData.TestViaMethodData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithParameterizedMethodData
        {
            public static IEnumerable<object[]> DataSource(int x)
            {
                return new[] {
                    new object[] { x / 2, 21.12, "Hello, world!" },
                    new object[] { 0, 0.0, null }
                };
            }

            [Theory]
            [MemberData("DataSource", 84)]
            public void TestViaMethodData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }
    }

    public class PropertyDataTests : AcceptanceTestV2
    {
        [Fact]
        public void RunsForEachDataElement()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithSelfPropertyData));

            var passing = Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Equal($"Xunit2TheoryAcceptanceTests+PropertyDataTests+ClassWithSelfPropertyData.TestViaPropertyData(x: 42, y: {21.12:G17}, z: \"Hello, world!\")", passing.Test.DisplayName);
            var failed = Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+PropertyDataTests+ClassWithSelfPropertyData.TestViaPropertyData(x: 0, y: 0, z: null)", failed.Test.DisplayName);
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithSelfPropertyData
        {
            public static IEnumerable<object[]> DataSource
            {
                get
                {
                    yield return new object[] { 42, 21.12, "Hello, world!" };
                    yield return new object[] { 0, 0.0, null };
                }
            }

            [Theory]
            [MemberData("DataSource")]
            public void TestViaPropertyData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void CanUsePropertyDataFromOtherClass()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithImportedPropertyData));

            Assert.Single(testMessages.OfType<ITestPassed>());
            Assert.Single(testMessages.OfType<ITestFailed>());
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        class ClassWithImportedPropertyData
        {
            [Theory]
            [MemberData("DataSource", MemberType = typeof(ClassWithSelfPropertyData))]
            public void TestViaPropertyData(int x, double y, string z)
            {
                Assert.NotNull(z);
            }
        }

        [Fact]
        public void NonStaticPropertyDataThrows()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithNonStaticPropertyData));

            var failed = Assert.Single(testMessages.Cast<ITestFailed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+PropertyDataTests+ClassWithNonStaticPropertyData.TestViaPropertyData", failed.Test.DisplayName);
            Assert.Equal("System.ArgumentException", failed.ExceptionTypes.Single());
            Assert.Equal("Could not find public static member (property, field, or method) named 'DataSource' on Xunit2TheoryAcceptanceTests+PropertyDataTests+ClassWithNonStaticPropertyData", failed.Messages.Single());
        }

        class ClassWithNonStaticPropertyData
        {
            public IEnumerable<object[]> DataSource { get { return null; } }

            [Theory]
            [MemberData("DataSource")]
            public void TestViaPropertyData(int x, double y, string z) { }
        }

        [Fact]
        public void CanUsePropertyDataFromBaseType()
        {
            var testMessages = Run<ITestResultMessage>(typeof(ClassWithBaseClassData));

            var passed = Assert.Single(testMessages.Cast<ITestPassed>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+PropertyDataTests+ClassWithBaseClassData.TestViaPropertyData(x: 42)", passed.Test.DisplayName);
        }

        class BaseClass
        {
            public static IEnumerable<object[]> DataSource { get { yield return new object[] { 42 }; } }
        }

        class ClassWithBaseClassData : BaseClass
        {
            [Theory]
            [MemberData("DataSource")]
            public void TestViaPropertyData(int x) { }
        }
    }

    public class CustomDataTests : AcceptanceTestV2
    {
        [Fact]
        public void TestDataWithInternalConstructor_ReturnsSingleFailingTheory()
        {
            CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;

            var testMessages = Run<IMessageSinkMessage>(typeof(ClassWithCustomDataWithInternalDataCtor));

            var types = testMessages.Select(t => t.GetType()).ToList();

            Assert.Collection(testMessages.OfType<ITestFailed>().OrderBy(t => t.TestCase.DisplayName),
                failed => Assert.Equal("Constructor on type 'Xunit2TheoryAcceptanceTests+CustomDataTests+MyCustomData' not found.", failed.Messages[0])
            );
            Assert.Empty(testMessages.OfType<ITestPassed>());
            Assert.Empty(testMessages.OfType<ITestSkipped>());
        }

        internal class MyCustomData : DataAttribute
        {
            internal MyCustomData() { }

            public override IEnumerable<object[]> GetData(MethodInfo testMethod)
                => new[] { new object[] { 42 }, new object[] { 2112 } };
        }

        class ClassWithCustomDataWithInternalDataCtor
        {
            [Theory]
            [MyCustomData]
            public void Passing(int unused) { }
        }

        [Fact]
        public void MemberDataAttributeBaseSubclass_Success()
        {
            var results = Run<ITestResultMessage>(typeof(ClassWithMemberDataAttributeBase));

            Assert.Collection(results.Cast<ITestPassed>().OrderBy(r => r.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+CustomDataTests+ClassWithMemberDataAttributeBase.Passing(unused: ""3"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+CustomDataTests+ClassWithMemberDataAttributeBase.Passing(unused: ""4"")", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+CustomDataTests+ClassWithMemberDataAttributeBase.Passing(unused: 1)", result.Test.DisplayName),
                result => Assert.Equal(@"Xunit2TheoryAcceptanceTests+CustomDataTests+ClassWithMemberDataAttributeBase.Passing(unused: 2)", result.Test.DisplayName)
            );
        }

        private class SingleMemberDataAttribute : MemberDataAttributeBase
        {
            public SingleMemberDataAttribute(string memberName, params object[] parameters) : base(memberName, parameters) { }

            protected override object[] ConvertDataItem(MethodInfo testMethod, object item)
            {
                return new object[] { item };
            }
        }

        private class ClassWithMemberDataAttributeBase
        {
            private static IEnumerable IEnumerableMethod()
            {
                yield return 1;
            }

            private static IEnumerable<int> IEnumerableIntMethod()
            {
                yield return 2;
            }

            private static IEnumerable<string> IEnumerableStringMethod()
            {
                yield return "3";
            }

            private static IEnumerable<object> IEnumerableObjectMethod()
            {
                yield return "4";
            }

            [Theory]
            [SingleMemberData(nameof(IEnumerableMethod))]
            [SingleMemberData(nameof(IEnumerableIntMethod))]
            [SingleMemberData(nameof(IEnumerableStringMethod))]
            [SingleMemberData(nameof(IEnumerableObjectMethod))]
            public void Passing(object unused) { }
        }
    }

    public class ErrorAggregation : AcceptanceTestV2
    {
        [Fact]
        public void EachTheoryHasIndividualExceptionMessage()
        {
            var testMessages = Run<ITestFailed>(typeof(ClassUnderTest));

            var equalFailure = Assert.Single(testMessages, msg => msg.Test.DisplayName == $"Xunit2TheoryAcceptanceTests+ErrorAggregation+ClassUnderTest.TestViaInlineData(x: 42, y: {21.12:G17}, z: ClassUnderTest {{ }})");
            Assert.Contains("Assert.Equal() Failure", equalFailure.Messages.Single());

            var notNullFailure = Assert.Single(testMessages, msg => msg.Test.DisplayName == "Xunit2TheoryAcceptanceTests+ErrorAggregation+ClassUnderTest.TestViaInlineData(x: 0, y: 0, z: null)");
            Assert.Contains("Assert.NotNull() Failure", notNullFailure.Messages.Single());
        }

        class ClassUnderTest
        {
            public static IEnumerable<object[]> Data
            {
                get
                {
                    yield return new object[] { 42, 21.12, new ClassUnderTest() };
                    yield return new object[] { 0, 0.0, null };
                }
            }

            [Theory]
            [MemberData("Data")]
            public void TestViaInlineData(int x, double y, object z)
            {
                Assert.Equal(0, x); // Fails the first data item
                Assert.NotNull(z);  // Fails the second data item
            }
        }
    }

    public class OverloadedMethodTests : AcceptanceTestV2
    {
        [Fact]
        public void TestMethodMessagesOnlySentOnce()
        {
            var testMessages = Run<IMessageSinkMessage>(typeof(ClassUnderTest));

            var methodStarting = Assert.Single(testMessages.OfType<ITestMethodStarting>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+OverloadedMethodTests+ClassUnderTest", methodStarting.TestClass.Class.Name);
            Assert.Equal("Theory", methodStarting.TestMethod.Method.Name);
            var methodFinished = Assert.Single(testMessages.OfType<ITestMethodFinished>());
            Assert.Equal("Xunit2TheoryAcceptanceTests+OverloadedMethodTests+ClassUnderTest", methodFinished.TestClass.Class.Name);
            Assert.Equal("Theory", methodFinished.TestMethod.Method.Name);
        }

        class ClassUnderTest
        {
            [Theory]
            [InlineData(42)]
            public void Theory(int value)
            {
            }

            [Theory]
            [InlineData("42")]
            public void Theory(string value)
            {
            }
        }
    }
}

#endif