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WhenEmptyTests.cs
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WhenEmptyTests.cs
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//
// Copyright (c) 2004-2019 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
using NLog.Internal;
namespace NLog.UnitTests.LayoutRenderers.Wrappers
{
using System;
using NLog;
using NLog.Layouts;
using Xunit;
public class WhenEmptyTests : NLogTestBase
{
[Fact]
public void CoalesceTest()
{
SimpleLayout l = @"${message:whenEmpty=<no message>}";
var le = LogEventInfo.Create(LogLevel.Info, "logger", "message");
Assert.Equal("message", l.Render(le));
// empty log message
var le2 = LogEventInfo.Create(LogLevel.Info, "logger", "");
Assert.Equal("<no message>", l.Render(le2));
}
[Fact]
public void CoalesceWithANestedLayout()
{
SimpleLayout l = @"${message:whenEmpty=${logger} emitted empty message}";
var le = LogEventInfo.Create(LogLevel.Info, "logger", "message");
Assert.Equal("message", l.Render(le));
// empty log message
var le2 = LogEventInfo.Create(LogLevel.Info, "mylogger", "");
Assert.Equal("mylogger emitted empty message", l.Render(le2));
}
[Fact]
public void WhenEmpty_MissingInner_ShouldNotThrow()
{
LogManager.ThrowExceptions = true;
SimpleLayout l = @"${whenEmpty:whenEmpty=${literal:text=c:\logs\}:inner=${environment:LOG_DIR_XXX}}api.log";
var le = LogEventInfo.Create(LogLevel.Info, "logger", "message");
Assert.Equal("api.log", l.Render(le));
}
[Fact]
public void WhenDbNullRawValueShouldWork()
{
SimpleLayout l = @"${event-properties:prop1:whenEmpty=${db-null}}";
{
var le = LogEventInfo.Create(LogLevel.Info, "logger", "message");
le.Properties["prop1"] = 1;
var success = l.TryGetRawValue(le, out var rawValue);
Assert.True(success);
Assert.Equal(1, rawValue);
}
// empty log message
{
var le = LogEventInfo.Create(LogLevel.Info, "logger", "message");
var success = l.TryGetRawValue(le, out var rawValue);
Assert.True(success);
Assert.Equal(DBNull.Value, rawValue);
}
}
[Theory]
[InlineData("message", "message")]
[InlineData("", "default")]
public void GetStringValueShouldWork(string message, string expected)
{
// Arrange
SimpleLayout layout = @"${message:whenEmpty=default}";
var stringValueRenderer = (IStringValueRenderer)layout.Renderers[0];
var logEvent = LogEventInfo.Create(LogLevel.Info, "logger", message);
// Act
var result = stringValueRenderer.GetFormattedString(logEvent);
// Assert
Assert.Equal(expected, result);
}
}
}