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Unit testing coverage for WriteLine activity

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lucas.hipolito 2025-10-10 10:30:24 +02:00
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test/unit/Elsa.Activities.UnitTests/Console/WriteLineTests.cs Normal file
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using Elsa.Activities.UnitTests.Helpers;
using Elsa.Expressions.Models;
using Elsa.Workflows;
using Microsoft.Extensions.DependencyInjection;
using NSubstitute;
namespace Elsa.Activities.UnitTests.Console;
public class WriteLineTests
{
[Fact]
public async Task Should_Write_String_Literal_To_Output()
{
// Arrange
const string expectedText = "Hello, World!";
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(expectedText);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Write_Literal_Expression_To_Output()
{
// Arrange
const string expectedText = "Literal expression";
var literal = new Literal<string>(expectedText);
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(literal);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Write_Delegate_Function_Result_To_Output()
{
// Arrange
const string expectedText = "Function result";
Func<string> textFunc = () => expectedText;
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(textFunc);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Write_Expression_Context_Function_Result_To_Output()
{
// Arrange
const string expectedText = "Context function result";
Func<ExpressionExecutionContext, string?> textFunc = _ => expectedText;
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(textFunc);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Write_Input_Value_To_Output()
{
// Arrange
const string expectedText = "Input value";
var input = new Input<string>(expectedText);
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(input);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Write_Null_Value_To_Output()
{
// Arrange
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(new Input<string>(default(string)!));
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(Arg.Is<string?>(s => s == null));
}
[Fact]
public async Task Should_Write_Empty_String_To_Output()
{
// Arrange
const string expectedText = "";
var mockTextWriter = Substitute.For<TextWriter>();
var mockProvider = Substitute.For<IStandardOutStreamProvider>();
mockProvider.GetTextWriter().Returns(mockTextWriter);
var writeLine = new WriteLine(expectedText);
// Act
await ActivityTestHelper.ExecuteActivityAsync(writeLine, services =>
{
services.AddSingleton(mockProvider);
});
// Assert
mockTextWriter.Received(1).WriteLine(expectedText);
}
[Fact]
public async Task Should_Use_Default_Provider_When_None_Configured()
{
// Arrange
const string expectedText = "Default provider test";
var writeLine = new WriteLine(expectedText);
// Act & Assert - Should not throw exception when no provider is configured
var exception = await Record.ExceptionAsync(async () =>
await ActivityTestHelper.ExecuteActivityAsync(writeLine));
Assert.Null(exception);
}
}