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Merged
dex3r merged 2 commits into from
Feb 27, 2026
+203 −35
Merged

Add PiExample and PiExampleFluent tests; extract shared test helpers #12

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Copilot Feb 27, 2026
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Add tests for PiExample and PiExampleFluent; refactor to share helper…
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43 changes: 43 additions & 0 deletions MattSourceGenHelpers.Tests/GeneratedCodeTestHelper.cs
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namespace MattSourceGenHelpers.Tests;

internal static class GeneratedCodeTestHelper
{
private const char UnicodeBom = '\uFEFF';

internal static string ReadGeneratedCode(string generatedFileName)
{
string generatedCodePath = GetGeneratedCodePath(generatedFileName);
return File.ReadAllText(generatedCodePath).TrimStart(UnicodeBom).ReplaceLineEndings("\n").TrimEnd();
}

private static string GetGeneratedCodePath(string generatedFileName)
{
string projectDirectory = FindProjectDirectory();
string[] generatedFiles = Directory.GetFiles(projectDirectory, generatedFileName, SearchOption.AllDirectories);

if (generatedFiles.Length != 1)
{
throw new AssertionException($"Expected exactly one generated file '{generatedFileName}', but found {generatedFiles.Length}.");
}

return generatedFiles[0];
}

private static string FindProjectDirectory()
{
string? currentDirectory = TestContext.CurrentContext.TestDirectory;

while (currentDirectory is not null)
{
string projectFilePath = Path.Combine(currentDirectory, "MattSourceGenHelpers.Tests.csproj");
if (File.Exists(projectFilePath))
{
return currentDirectory;
}

currentDirectory = Directory.GetParent(currentDirectory)?.FullName;
}

throw new DirectoryNotFoundException("Could not locate MattSourceGenHelpers.Tests project directory.");
}
}
65 changes: 65 additions & 0 deletions MattSourceGenHelpers.Tests/PiExampleFluentTests.cs
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using MattSourceGenHelpers.Abstractions;
// ReSharper disable ConvertClosureToMethodGroup

namespace MattSourceGenHelpers.Tests;

[TestFixture]
public class PiExampleFluentTests
{
[TestCase(0, 3)]
[TestCase(1, 1)]
[TestCase(2, 4)]
[TestCase(300, 3)]
[TestCase(301, 7)]
[TestCase(302, 2)]
[TestCase(303, 4)]
[TestCase(5, 9)]
public void PiExampleFluentLikeGenerator_ProducesExpectedRuntimeOutput(int decimalNumber, int expectedDigit)
{
int result = TestPiFluentClass.GetPiDecimal(decimalNumber);

Assert.That(result, Is.EqualTo(expectedDigit));
}

[Test]
public void PiExampleFluentLikeGenerator_ProducesExpectedGeneratedCode()
{
string generatedCode = GeneratedCodeTestHelper.ReadGeneratedCode("TestPiFluentClass_GetPiDecimal.g.cs");
string expectedCode = """
namespace MattSourceGenHelpers.Tests;

static partial class TestPiFluentClass
{
public static partial int GetPiDecimal(int decimalNumber)
{
switch (decimalNumber)
{
case 0: return 3;
case 1: return 1;
case 2: return 4;
case 300: return 3;
case 301: return 7;
case 302: return 2;
case 303: return 4;
default: return TestSlowMath.CalculatePiDecimal(decimalNumber);
}
}
}
""".ReplaceLineEndings("\n").TrimEnd();

Assert.That(generatedCode, Is.EqualTo(expectedCode));
}
}

public static partial class TestPiFluentClass
{
public static partial int GetPiDecimal(int decimalNumber);

[GeneratesMethod(nameof(GetPiDecimal))]
static IMethodImplementationGenerator GetPiDecimal_Generator() =>
Generator
.MethodImplementation<int, int>()
.WithSwitchBody()
.ForCases(0, 1, 2, Integer.Range(300, 303)).CompileTimeBody(decimalNumber => TestSlowMath.CalculatePiDecimal(decimalNumber))
.ForDefaultCase().RuntimeBody(decimalNumber => () => TestSlowMath.CalculatePiDecimal(decimalNumber));
}
60 changes: 60 additions & 0 deletions MattSourceGenHelpers.Tests/PiExampleTests.cs
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using MattSourceGenHelpers.Abstractions;
// ReSharper disable ConvertClosureToMethodGroup

namespace MattSourceGenHelpers.Tests;

[TestFixture]
public class PiExampleTests
{
[TestCase(0, 3)]
[TestCase(1, 1)]
[TestCase(2, 4)]
[TestCase(5, 9)]
public void PiExampleLikeGenerator_ProducesExpectedRuntimeOutput(int decimalNumber, int expectedDigit)
{
int result = TestPiClass.GetPiDecimal(decimalNumber);

Assert.That(result, Is.EqualTo(expectedDigit));
}

[Test]
public void PiExampleLikeGenerator_ProducesExpectedGeneratedCode()
{
string generatedCode = GeneratedCodeTestHelper.ReadGeneratedCode("TestPiClass_GetPiDecimal.g.cs");
string expectedCode = """
namespace MattSourceGenHelpers.Tests;

static partial class TestPiClass
{
public static partial int GetPiDecimal(int decimalNumber)
{
switch (decimalNumber)
{
case 0: return 3;
case 1: return 1;
case 2: return 4;
default: return TestSlowMath.CalculatePiDecimal(decimalNumber);
}
}
}
""".ReplaceLineEndings("\n").TrimEnd();

Assert.That(generatedCode, Is.EqualTo(expectedCode));
}
}

public static partial class TestPiClass
{
public static partial int GetPiDecimal(int decimalNumber);

[GeneratesMethod(nameof(GetPiDecimal))]
[SwitchCase(arg1: 0)]
[SwitchCase(arg1: 1)]
[SwitchCase(arg1: 2)]
static int GetPiDecimal_Generator_Specialized(int decimalNumber) =>
TestSlowMath.CalculatePiDecimal(decimalNumber);

[GeneratesMethod(nameof(GetPiDecimal))]
[SwitchDefault]
static Func<int, int> GetPiDecimal_Generator_Fallback() => decimalNumber => TestSlowMath.CalculatePiDecimal(decimalNumber);
}
34 changes: 34 additions & 0 deletions MattSourceGenHelpers.Tests/TestSlowMath.cs
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namespace MattSourceGenHelpers.Tests;

internal static class TestSlowMath
{
// Pi digits string (0-indexed: position 0 = '3', position 1 = '1', position 2 = '4', ...)
private static readonly string PiDigits =
"31415926535897932384626433832795028841971693993751" +
"05820974944592307816406286208998628034825342117067" +
"98214808651328230664709384460955058223172535940812" +
"84811174502841027019385211055596446229489549303819" +
"64428810975665933446128475648233786783165271201909" +
"14564856692346034861045432664821339360726024914127" +
"37245870066063155881748815209209628292540917153643" +
"67892590360011330530548820466521384146951941511609" +
"43305727036575959195309218611738193261179310511854" +
"80744623799627495673518857527248912279381830119491" +
"29833673362440656643086021394946395224737190702179" +
"86094370277053921717629317675238467481846766940513" +
"20005681271452635608277857713427577896091736371787" +
"21468440901224953430146549585371050792279689258923" +
"54201995611212902196086403441815981362977477130996" +
"05187072113499999983729780499510597317328160963185" +
"95024459455346908302642522308253344685035261931188" +
"17101000313783875288658753320838142061717766914730" +
"35982534904287554687311595628638823537875937519577" +
"81857780532171226806613001927876611195909216420198";

public static int CalculatePiDecimal(int decimalNumber)
{
if (decimalNumber >= 0 && decimalNumber < PiDigits.Length)
return PiDigits[decimalNumber] - '0';
return 0;
}
}
36 changes: 1 addition & 35 deletions MattSourceGenHelpers.Tests/UnitTest1.cs
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Expand Up @@ -4,8 +4,6 @@ namespace MattSourceGenHelpers.Tests;

public class Tests
{
private const char UnicodeBom = '\uFEFF';

[Test]
public void ColorsClassLikeGenerator_ProducesExpectedRuntimeOutput()
{
Expand All @@ -19,8 +17,7 @@ public void ColorsClassLikeGenerator_ProducesExpectedRuntimeOutput()
[Test]
public void ColorsClassLikeGenerator_ProducesExpectedGeneratedCode()
{
string generatedCodePath = GetGeneratedCodePath();
string generatedCode = File.ReadAllText(generatedCodePath).TrimStart(UnicodeBom).ReplaceLineEndings("\n").TrimEnd();
string generatedCode = GeneratedCodeTestHelper.ReadGeneratedCode("TestColorsClass_GetAllColorsString.g.cs");
string expectedCode = """
namespace MattSourceGenHelpers.Tests;

Expand All @@ -35,37 +32,6 @@ public partial string GetAllColorsString()

Assert.That(generatedCode, Is.EqualTo(expectedCode));
}

private static string GetGeneratedCodePath()
{
string projectDirectory = FindProjectDirectory();
string[] generatedFiles = Directory.GetFiles(projectDirectory, "TestColorsClass_GetAllColorsString.g.cs", SearchOption.AllDirectories);

if (generatedFiles.Length != 1)
{
throw new AssertionException($"Expected exactly one generated file, but found {generatedFiles.Length}.");
}

return generatedFiles[0];
}

private static string FindProjectDirectory()
{
string? currentDirectory = TestContext.CurrentContext.TestDirectory;

while (currentDirectory is not null)
{
string projectFilePath = Path.Combine(currentDirectory, "MattSourceGenHelpers.Tests.csproj");
if (File.Exists(projectFilePath))
{
return currentDirectory;
}

currentDirectory = Directory.GetParent(currentDirectory)?.FullName;
}

throw new DirectoryNotFoundException("Could not locate MattSourceGenHelpers.Tests project directory.");
}
}

public enum TestColorsEnum
Expand Down