CompletionProviderTests.fs

// To run the tests in this file:
//
// Technique 1: Compile VisualFSharp.UnitTests.dll and run it as a set of unit tests
//
// Technique 2:
//
//   Enable some tests in the #if EXE section at the end of the file, 
//   then compile this file as an EXE that has InternalsVisibleTo access into the
//   appropriate DLLs.  This can be the quickest way to get turnaround on updating the tests
//   and capturing large amounts of structured output.
(*
    cd Debug\net40\bin
    .\fsc.exe --define:EXE -r:.\Microsoft.Build.Utilities.Core.dll -o VisualFSharp.UnitTests.exe -g --optimize- -r .\FSharp.Compiler.Private.dll  -r .\FSharp.Editor.dll -r nunit.framework.dll ..\..\..\tests\service\FsUnit.fs ..\..\..\tests\service\Common.fs /delaysign /keyfile:..\..\..\src\fsharp\msft.pubkey ..\..\..\vsintegration\tests\UnitTests\CompletionProviderTests.fs 
    .\VisualFSharp.UnitTests.exe 
*)
// Technique 3: 
// 
//    Use F# Interactive.  This only works for FSharp.Compiler.Service.dll which has a public API

// Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information.
module Microsoft.VisualStudio.FSharp.Editor.Tests.Roslyn.CompletionProviderTests

open System
open System.Linq

open NUnit.Framework

open Microsoft.CodeAnalysis
open Microsoft.CodeAnalysis.Completion
open Microsoft.CodeAnalysis.Text
open Microsoft.VisualStudio.FSharp.Editor

open FSharp.Compiler.SourceCodeServices
open UnitTests.TestLib.LanguageService

let filePath = "C:\\test.fs"
let internal projectOptions opts = { 
    ProjectFileName = "C:\\test.fsproj"
    ProjectId = None
    SourceFiles =  [| filePath |]
    ReferencedProjects = [| |]
    OtherOptions = opts
    IsIncompleteTypeCheckEnvironment = true
    UseScriptResolutionRules = false
    LoadTime = DateTime.MaxValue
    OriginalLoadReferences = []
    UnresolvedReferences = None
    ExtraProjectInfo = None
    Stamp = None
}

let formatCompletions(completions : string seq) =
    "\n\t" + String.Join("\n\t", completions)

let VerifyCompletionListWithOptions(fileContents: string, marker: string, expected: string list, unexpected: string list, opts) =
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let results = 
        FSharpCompletionProvider.ProvideCompletionsAsyncAux(checker, SourceText.From(fileContents), caretPosition, projectOptions opts, filePath, 0, (fun _ -> []), LanguageServicePerformanceOptions.Default, IntelliSenseOptions.Default) 
        |> Async.RunSynchronously 
        |> Option.defaultValue (ResizeArray())
        |> Seq.map(fun result -> result.DisplayText)

    let expectedFound =
        expected
        |> Seq.filter results.Contains

    let expectedNotFound =
        expected
        |> Seq.filter (expectedFound.Contains >> not)

    let unexpectedNotFound =
        unexpected
        |> Seq.filter (results.Contains >> not)

    let unexpectedFound =
        unexpected
        |> Seq.filter (unexpectedNotFound.Contains >> not)

    // If either of these are true, then the test fails.
    let hasExpectedNotFound = not (Seq.isEmpty expectedNotFound)
    let hasUnexpectedFound = not (Seq.isEmpty unexpectedFound)

    if hasExpectedNotFound || hasUnexpectedFound then
        let expectedNotFoundMsg = 
            if hasExpectedNotFound then
                sprintf "\nExpected completions not found:%s\n" (formatCompletions expectedNotFound)
            else
                String.Empty

        let unexpectedFoundMsg = 
            if hasUnexpectedFound then
                sprintf "\nUnexpected completions found:%s\n" (formatCompletions unexpectedFound)
            else
                String.Empty

        let completionsMsg = sprintf "\nin Completions:%s" (formatCompletions results)

        let msg = sprintf "%s%s%s" expectedNotFoundMsg unexpectedFoundMsg completionsMsg

        Assert.Fail(msg)
let VerifyCompletionList(fileContents, marker, expected, unexpected) =
   VerifyCompletionListWithOptions(fileContents, marker, expected, unexpected, [| |])


let VerifyCompletionListExactly(fileContents: string, marker: string, expected: string list) =
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    
    let actual = 
        FSharpCompletionProvider.ProvideCompletionsAsyncAux(checker, SourceText.From(fileContents), caretPosition, projectOptions [| |], filePath, 0, (fun _ -> []), LanguageServicePerformanceOptions.Default, IntelliSenseOptions.Default) 
        |> Async.RunSynchronously 
        |> Option.defaultValue (ResizeArray())
        |> Seq.toList
        // sort items as Roslyn do - by `SortText`
        |> List.sortBy (fun x -> x.SortText)

    let actualNames = actual |> List.map (fun x -> x.DisplayText)

    if actualNames <> expected then
        Assert.Fail(sprintf "Expected:\n%s,\nbut was:\n%s\nactual with sort text:\n%s" 
                            (String.Join("; ", expected |> List.map (sprintf "\"%s\""))) 
                            (String.Join("; ", actualNames |> List.map (sprintf "\"%s\"")))
                            (String.Join("\n", actual |> List.map (fun x -> sprintf "%s => %s" x.DisplayText x.SortText))))

let VerifyNoCompletionList(fileContents: string, marker: string) =
    VerifyCompletionListExactly(fileContents, marker, [])

let VerifyCompletionListSpan(fileContents: string, marker: string, expected: string) =
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let sourceText = SourceText.From(fileContents)
    let resultSpan = CompletionUtils.getDefaultCompletionListSpan(sourceText, caretPosition, documentId, filePath, [])
    Assert.AreEqual(expected, sourceText.ToString(resultSpan))

[<Test>]
let ShouldTriggerCompletionAtCorrectMarkers() =
    let testCases = 
       [("x", true)
        ("y", true)
        ("1", false)
        ("2", false)
        ("x +", false)
        ("Console.Write", false)
        ("System.", true)
        ("Console.", true) ]

    for (marker, shouldBeTriggered) in testCases do
      let fileContents = """
let x = 1
let y = 2
System.Console.WriteLine(x + y)
"""

      let caretPosition = fileContents.IndexOf(marker) + marker.Length
      let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
      let getInfo() = documentId, filePath, []
      let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
      Assert.AreEqual(shouldBeTriggered, triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should compute the correct result")

[<Test>]
let ShouldNotTriggerCompletionAfterAnyTriggerOtherThanInsertionOrDeletion() = 
    for triggerKind in [ CompletionTriggerKind.Invoke; CompletionTriggerKind.Snippets ] do
        let fileContents = "System.Console.WriteLine(123)"
        let caretPosition = fileContents.IndexOf("rite")
        let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
        let getInfo() = documentId, filePath, []
        let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, triggerKind, getInfo, IntelliSenseOptions.Default)
        Assert.IsFalse(triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should not trigger")
    
[<Test>]
let ShouldNotTriggerCompletionInStringLiterals() =
    let fileContents = "let literal = \"System.Console.WriteLine()\""
    let caretPosition = fileContents.IndexOf("System.")
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsFalse(triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should not trigger")
    
[<Test>]
let ShouldNotTriggerCompletionInComments() =
    let fileContents = """
(*
This is a comment
System.Console.WriteLine()
*)
"""
    let caretPosition = fileContents.IndexOf("System.")
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsFalse(triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should not trigger")
    
[<Test>]
let ShouldTriggerCompletionInInterpolatedString() =
    let fileContents = """

let x = 1
let y = 2
let z = $"abc  {System.Console.WriteLine(x + y)} def"
"""
    let testCases = 
       [
        ("x", true)
        ("y", true)
        ("1", false)
        ("2", false)
        ("x +", false)
        ("Console.Write", false)
        ("System.", true)
        ("Console.", true) ]

    for (marker, shouldBeTriggered) in testCases do
        let caretPosition = fileContents.IndexOf(marker) + marker.Length
        let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
        let getInfo() = documentId, filePath, []
        let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
        Assert.AreEqual(shouldBeTriggered, triggered, sprintf "FSharpCompletionProvider.ShouldTriggerCompletionAux() should compute the correct result for marker '%s'" marker) 
    
[<Test>]
let ShouldNotTriggerCompletionInExcludedCode() =
    let fileContents = """
#if UNDEFINED
System.Console.WriteLine()
#endif
"""
    let caretPosition = fileContents.IndexOf("System.")
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsFalse(triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should not trigger")

[<Test>]
let ShouldNotTriggerCompletionInOperatorWithDot() =
    // Simulate mistyping '|>' as '|.'
    let fileContents = """
let f() =
    12.0 |. sqrt
"""
    let caretPosition = fileContents.IndexOf("|.")
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsFalse(triggered, "FSharpCompletionProvider.ShouldTriggerCompletionAux() should not trigger on operators")

[<Test>]
let ShouldTriggerCompletionInAttribute() =
    let fileContents = """
[<A
module Foo = module end
"""
    let marker = "A"
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsTrue(triggered, "Completion should trigger on Attributes.")

[<Test>]
let ShouldTriggerCompletionAfterDerefOperator() =
    let fileContents = """
let foo = ref 12
printfn "%d" !f
"""
    let marker = "!f"
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsTrue(triggered, "Completion should trigger after typing an identifier that follows a dereference operator (!).")

[<Test>]
let ShouldTriggerCompletionAfterAddressOfOperator() =
    let fileContents = """
type Point = { mutable X: int; mutable Y: int }
let pnt = { X = 1; Y = 2 }
use ptr = fixed &p
"""
    let marker = "&p"
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsTrue(triggered, "Completion should trigger after typing an identifier that follows an addressOf operator (&).")

[<Test>]
let ShouldTriggerCompletionAfterArithmeticOperation() =
    let fileContents = """
let xVal = 1.0
let yVal = 2.0
let zVal

xVal+y
xVal-y
xVal*y
xVal/y
xVal%y
xVal**y
"""

    let markers = [ "+y"; "-y"; "*y"; "/y"; "%y";  "**y"]

    for marker in markers do 
        let caretPosition = fileContents.IndexOf(marker) + marker.Length
        let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
        let getInfo() = documentId, filePath, []
        let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
        Assert.IsTrue(triggered, "Completion should trigger after typing an identifier that follows a mathematical operation")

[<Test>]
let ShouldTriggerCompletionAtStartOfFileWithInsertion =
    let fileContents = """
l"""

    let marker = "l"
    let caretPosition = fileContents.IndexOf(marker) + marker.Length
    let documentId = DocumentId.CreateNewId(ProjectId.CreateNewId())
    let getInfo() = documentId, filePath, []
    let triggered = FSharpCompletionProvider.ShouldTriggerCompletionAux(SourceText.From(fileContents), caretPosition, CompletionTriggerKind.Insertion, getInfo, IntelliSenseOptions.Default)
    Assert.IsTrue(triggered, "Completion should trigger after typing an Insertion character at the top of the file, e.g. a function definition in a new script file.")

[<Test>]
let ShouldDisplayTypeMembers() =
    let fileContents = """
type T1() =
    member this.M1 = 5
    member this.M2 = "literal"

[<EntryPoint>]
let main argv =
    let obj = T1()
    obj.
"""
    VerifyCompletionList(fileContents, "obj.", ["M1"; "M2"], ["System"])

[<Test>]
let ShouldDisplaySystemNamespace() =
    let fileContents = """
type T1 =
    member this.M1 = 5
    member this.M2 = "literal"
System.Console.WriteLine()
"""
    VerifyCompletionList(fileContents, "System.", ["Console"; "Array"; "String"], ["T1"; "M1"; "M2"])

[<Test>]
let ShouldDisplaySystemNamespaceInInterpolatedString() =
    let fileContents = """
type T1 =
    member this.M1 = 5
    member this.M2 = "literal"
let x = $"1 not the same as {System.Int32.MaxValue} is it"
"""
    VerifyCompletionListWithOptions(fileContents, "System.", ["Console"; "Array"; "String"], ["T1"; "M1"; "M2"], [| "/langversion:preview" |])

[<Test>]
let ``Class instance members are ordered according to their kind and where they are defined (simple case, by a variable)``() =
    let fileContents = """
type Base() =
    member __.BaseMethod() = 1
    member __.BaseProp = 1

type Class() = 
    inherit Base()
    member this.MineMethod() = 1
    member this.MineProp = 1

let x = Class()
x.
"""
    let expected = ["MineProp"; "BaseProp"; "MineMethod"; "BaseMethod"; "Equals"; "GetHashCode"; "GetType"; "ToString"]
    VerifyCompletionListExactly(fileContents, "x.", expected)

[<Test>]
let ``Class instance members are ordered according to their kind and where they are defined (simple case, by a constructor)``() =
    let fileContents = """
type Base() =
    member __.BaseMethod() = 1
    member __.BaseProp = 1

type Class() = 
    inherit Base()
    member this.MineMethod() = 1
    member this.MineProp = 1

let x = Class().
"""
    let expected = ["MineProp"; "BaseProp"; "MineMethod"; "BaseMethod"; "Equals"; "GetHashCode"; "GetType"; "ToString"]
    VerifyCompletionListExactly(fileContents, "let x = Class().", expected)


[<Test>]
let ``Class static members are ordered according to their kind and where they are defined``() =
    let fileContents = """
type Base() =
    static member BaseStaticMethod() = 1
    static member BaseStaticProp = 1

type Class() = 
    inherit Base()
    static member MineStaticMethod() = 1
    static member MineStaticProp = 2

Class.
"""
    let expected = ["MineStaticProp"; "BaseStaticProp"; "MineStaticMethod"; "BaseStaticMethod"]
    VerifyCompletionListExactly(fileContents, "Class.", expected)

[<Test>]
let ``Class instance members are ordered according to their kind and where they are defined (complex case)``() =
    let fileContents = """
type Base() =
    inherit System.Collections.Generic.List<int>
    member __.BaseMethod() = 1
    member __.BaseProp = 1

type Class() = 
    inherit Base()
    member this.MineMethod() = 1
    member this.MineProp = 1

let x = Class()
x.
"""
    let expected = ["MineProp"; "BaseProp"; "Capacity"; "Count"; "Item"; "MineMethod"; "Add"; "AddRange"; "AsReadOnly"; "BaseMethod"; "BinarySearch"; "Clear"; "Contains"
                    "ConvertAll"; "CopyTo"; "Equals"; "Exists"; "Find"; "FindAll"; "FindIndex"; "FindLast"; "FindLastIndex"; "ForEach"; "GetEnumerator"; "GetHashCode"
                    "GetRange"; "GetType"; "IndexOf"; "Insert"; "InsertRange"; "LastIndexOf"; "Remove"; "RemoveAll"; "RemoveAt"; "RemoveRange"; "Reverse"; "Sort"
                    "ToArray"; "ToString"; "TrimExcess"; "TrueForAll"]
    VerifyCompletionListExactly(fileContents, "x.", expected)

[<Test>]
let ``Constructing a new class with object initializer syntax``() =
    let fileContents = """
type A() =
    member val SettableProperty = 1 with get, set
    member val AnotherSettableProperty = 1 with get, set
    member val NonSettableProperty = 1
    
let _ = new A(Setta)
"""

    let expected = ["SettableProperty"; "AnotherSettableProperty"]
    let notExpected = ["NonSettableProperty"]
    VerifyCompletionList(fileContents, "(Setta", expected, notExpected)

[<Test>]
let ``Constructing a new class with object initializer syntax and verifying 'at' character doesn't exist.``() =
    let fileContents = """
type A() =
    member val SettableProperty = 1 with get, set
    member val AnotherSettableProperty = 1 with get, set
    member val NonSettableProperty = 1
    
let _ = new A(Setta)
"""

    let expected = []
    let notExpected = ["SettableProperty@"; "AnotherSettableProperty@"; "NonSettableProperty@"]
    VerifyCompletionList(fileContents, "(Setta", expected, notExpected)

[<Test;Ignore("https://github.com/Microsoft/visualfsharp/issues/3954")>]
let ``Constructing a new fully qualified class with object initializer syntax without ending paren``() =
    let fileContents = """
module M =
    type A() =
        member val SettableProperty = 1 with get, set
        member val AnotherSettableProperty = 1 with get, set
        member val NonSettableProperty = 1
    
let _ = new M.A(Setta
"""

    let expected = ["SettableProperty"; "AnotherSettableProperty"]
    let notExpected = ["NonSettableProperty"]
    VerifyCompletionList(fileContents, "(Setta", expected, notExpected)

[<Test>]
let ``Extension methods go after everything else, extension properties are treated as normal ones``() =
    let fileContents = """
open System.Collections.Generic

type List<'a> with
    member __.ExtensionProp = 1
    member __.ExtensionMeth() = 1

List().
"""
    let expected = ["Capacity"; "Count"; "Item"; "ExtensionProp"; "Add"; "AddRange"; "AsReadOnly"; "BinarySearch"; "Clear"; "Contains"; "ConvertAll"; "CopyTo"; "Exists"
                    "Find"; "FindAll"; "FindIndex"; "FindLast"; "FindLastIndex"; "ForEach"; "GetEnumerator"; "GetRange"; "IndexOf"; "Insert"; "InsertRange"; "LastIndexOf"
                    "Remove"; "RemoveAll"; "RemoveAt"; "RemoveRange"; "Reverse"; "Sort"; "ToArray"; "TrimExcess"; "TrueForAll"; "Equals"; "GetHashCode"; "GetType"; "ToString"
                    "ExtensionMeth"]
    VerifyCompletionListExactly(fileContents, "List().", expected)

[<Test>]
let ``Completion for open contains namespaces and static types``() =
    let fileContents = """
open type System.Ma
"""
    let expected = ["Management"; "Math"] // both namespace and static type
    VerifyCompletionList(fileContents, "System.Ma", expected, [])

[<Test>]
let ``No completion on type name at declaration site``() =
    let fileContents = """
type T

"""
    VerifyNoCompletionList(fileContents, "type T")

[<Test>]
let ``No completion on name of unfinished function declaration``() =
    let fileContents = """
let f

"""
    VerifyNoCompletionList(fileContents, "let f")

[<Test>]
let ``No completion on name of value declaration``() =
    let fileContents = """
let xyz = 1

"""
    VerifyNoCompletionList(fileContents, "let xy")

[<Test>]
let ``No completion on name of function declaration``() =
    let fileContents = """
let foo x = 1

"""
    VerifyNoCompletionList(fileContents, "let fo")

[<Test>]
let ``No completion on name of tupled function declaration``() =
    let fileContents = """
let foo (x, y) = 1

"""
    VerifyNoCompletionList(fileContents, "let fo")

[<Test>]
let ``No completion on member name at declaration site``() =
    let fileContents = """
type T() =
    member this.M
"""
    VerifyNoCompletionList(fileContents, "member this.M")

[<Test>]
let ``No completion on function first argument name``() =
    let fileContents = """
let func (p
"""
    VerifyNoCompletionList(fileContents, "let func (p")

[<Test>]
let ``No completion on function subsequent argument name``() =
    let fileContents = """
let func (p, h
"""
    VerifyNoCompletionList(fileContents, "let func (p, h")

[<Test>]
let ``No completion on curried function subsequent argument name``() =
    let fileContents = """
let func (p) (h
"""
    VerifyNoCompletionList(fileContents, "let func (p) (h")

[<Test>]
let ``No completion on method first argument name``() =
    let fileContents = """
type T() =
    member this.M(p) = ()
"""
    VerifyNoCompletionList(fileContents, "member this.M(p")

[<Test>]
let ``No completion on method subsequent argument name``() =
    let fileContents = """
type T() =
    member this.M(p:int, h ) = ()
"""
    VerifyNoCompletionList(fileContents, "member this.M(p:int, h")

[<Test>]
let ``Provide completion on first function argument type hint``() =
    let fileContents = """
let func (p:i
"""
    VerifyCompletionList(fileContents, "let func (p:i", ["int"], [])

[<Test>]
let ``Provide completion on subsequent function argument type hint``() =
    let fileContents = """
let func (p:int, h:f
"""
    VerifyCompletionList(fileContents, "let func (p:int, h:f", ["float"], [])

[<Test>]
let ``Provide completion on local function argument type hint``() =
    let fileContents = """
let top () =
    let func (p:i
"""
    VerifyCompletionList(fileContents, "let func (p:i", ["int"], [])

[<Test>]
let ``No completion on implicit constructor first argument name``() =
    let fileContents = """
type T(p) =
"""
    VerifyNoCompletionList(fileContents, "type T(p")

[<Test>]
let ``No completion on implicit constructor subsequent argument name``() =
    let fileContents = """
type T(p:int, h) =
"""
    VerifyNoCompletionList(fileContents, "type T(p:int, h")

[<Test>]
let ``Provide completion on implicit constructor argument type hint``() =
    let fileContents = """
type T(p:i) =
"""
    VerifyCompletionList(fileContents, "type T(p:i", ["int"], [])

[<Test>]
let ``No completion on lambda argument name``() =
    let fileContents = """
let _ = fun (p) -> ()
"""
    VerifyNoCompletionList(fileContents, "let _ = fun (p")

[<Test>]
let ``Provide completion on lambda argument type hint``() =
    let fileContents = """
let _ = fun (p:i) -> ()
"""
    VerifyCompletionList(fileContents, "let _ = fun (p:i", ["int"], [])

[<Test>]
let ``Extensions.Bug5162``() =
    let fileContents = """
module Extensions =
    type System.Object with
        member x.P = 1
module M2 =
    let x = 1
    Ext
"""
    VerifyCompletionList(fileContents, "    Ext", ["Extensions"; "ExtraTopLevelOperators"], [])

[<Test>]
let ``Custom operations should be at the top of completion list inside computation expression``() =
    let fileContents = """
let joinLocal = 1

let _ =
    query {
        for i in 1..10 do
        select i
        join
    }
"""
    VerifyCompletionList(fileContents, "        join", ["groupJoin"; "join"; "leftOuterJoin"; "joinLocal"], [])

[<Test>]
let ``Byref Extension Methods`` () =
    let fileContents = """
module Extensions =
    open System
    open System.Runtime.CompilerServices

    [<Struct>]
    type Message = Message of String

    [<Sealed; AbstractClass; Extension>]
    type MessageExtensions private () =
        let (|Message|) (Message message) = message

        [<Extension>]
        static member Print (Message message : Message) =
            printfn "%s" message

        [<Extension>]
        static member PrintRef (Message message : inref<Message>) =
            printfn "%s" message

    let wrappedMessage = Message "Hello World"

    wrappedMessage.
"""
    VerifyCompletionList(fileContents, "wrappedMessage.", ["PrintRef"], [])

[<Test>]
let ``Completion list span works with underscore in identifier``() =
    let fileContents = """
let x = A.B_C
"""
    VerifyCompletionListSpan(fileContents, "A.B_C", "B_C")

[<Test>]
let ``Completion list span works with digit in identifier``() =
    let fileContents = """
let x = A.B1C
"""
    VerifyCompletionListSpan(fileContents, "A.B1C", "B1C")

[<Test>]
let ``Completion list span works with enclosed backtick identifier``() =
    let fileContents = """
let x = A.``B C``
"""
    VerifyCompletionListSpan(fileContents, "A.``B C``", "``B C``")

[<Test>]
let ``Completion list span works with partial backtick identifier``() =
    let fileContents = """
let x = A.``B C
"""
    VerifyCompletionListSpan(fileContents, "A.``B C", "``B C")

[<Test>]
let ``Completion list span works with first of multiple enclosed backtick identifiers``() =
    let fileContents = """
let x = A.``B C`` + D.``E F``
"""
    VerifyCompletionListSpan(fileContents, "A.``B C``", "``B C``")

[<Test>]
let ``Completion list span works with last of multiple enclosed backtick identifiers``() =
    let fileContents = """
let x = A.``B C`` + D.``E F``
"""
    VerifyCompletionListSpan(fileContents, "D.``E F``", "``E F``")

#if EXE
ShouldDisplaySystemNamespace()
#endif