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Migrate test suite from xUnit + FluentAssertions to NUnit 4.4.0 with controlled concurrency (#832)
Co-authored-by: copilot-swe-agent[bot] <[email protected]> Co-authored-by: glennawatson <[email protected]>
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‎.editorconfig‎

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[*.{cmd, bat}]
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end_of_line = crlf
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vsspell_dictionary_languages = en-US
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vsspell_dictionary_languages = en-US
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[*.{cs,vb}]
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#############################################
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# NUnit Analyzers — enable all as errors
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#############################################
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# Structure Rules (NUnit1001 - )
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dotnet_diagnostic.NUnit1001.severity = error # TestCase args must match parameter types
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dotnet_diagnostic.NUnit1002.severity = error # TestCaseSource should use nameof
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dotnet_diagnostic.NUnit1003.severity = error # TestCase provided too few arguments
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dotnet_diagnostic.NUnit1004.severity = error # TestCase provided too many arguments
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dotnet_diagnostic.NUnit1005.severity = error # ExpectedResult type must match return type
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dotnet_diagnostic.NUnit1006.severity = error # ExpectedResult must not be used on void methods
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dotnet_diagnostic.NUnit1007.severity = error # Non-void method but no ExpectedResult provided
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dotnet_diagnostic.NUnit1008.severity = error # ParallelScope.Self at assembly level has no effect
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dotnet_diagnostic.NUnit1009.severity = error # ParallelScope.Children on non-parameterized test
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dotnet_diagnostic.NUnit1010.severity = error # ParallelScope.Fixtures on a test method
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dotnet_diagnostic.NUnit1011.severity = error # TestCaseSource member does not exist
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dotnet_diagnostic.NUnit1012.severity = error # async test method must have non-void return type
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dotnet_diagnostic.NUnit1013.severity = error # async method must use non-generic Task when no result
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dotnet_diagnostic.NUnit1014.severity = error # async method must use Task<T> when result expected
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dotnet_diagnostic.NUnit1015.severity = error # Source type does not implement I(Async)Enumerable
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dotnet_diagnostic.NUnit1016.severity = error # Source type lacks default constructor
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dotnet_diagnostic.NUnit1017.severity = error # Specified source is not static
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dotnet_diagnostic.NUnit1018.severity = error # TestCaseSource param count mismatch (target method)
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dotnet_diagnostic.NUnit1019.severity = error # Source does not return I(Async)Enumerable
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dotnet_diagnostic.NUnit1020.severity = error # Parameters provided to field/property source
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dotnet_diagnostic.NUnit1021.severity = error # ValueSource should use nameof
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dotnet_diagnostic.NUnit1022.severity = error # Specified ValueSource is not static
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dotnet_diagnostic.NUnit1023.severity = error # ValueSource cannot supply required parameters
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dotnet_diagnostic.NUnit1024.severity = error # ValueSource does not return I(Async)Enumerable
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dotnet_diagnostic.NUnit1025.severity = error # ValueSource member does not exist
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dotnet_diagnostic.NUnit1026.severity = error # Test or setup/teardown method is not public
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dotnet_diagnostic.NUnit1027.severity = error # Test method has parameters but no arguments supplied
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dotnet_diagnostic.NUnit1028.severity = error # Non-test method is public
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dotnet_diagnostic.NUnit1029.severity = error # TestCaseSource param count mismatch (Test method)
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dotnet_diagnostic.NUnit1030.severity = error # TestCaseSource parameter type mismatch (Test method)
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dotnet_diagnostic.NUnit1031.severity = error # ValuesAttribute args must match parameter types
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dotnet_diagnostic.NUnit1032.severity = error # IDisposable field/property should be disposed in TearDown
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dotnet_diagnostic.NUnit1033.severity = error # TestContext.Write methods will be obsolete
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dotnet_diagnostic.NUnit1034.severity = error # Base TestFixtures should be abstract
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dotnet_diagnostic.NUnit1035.severity = error # Range 'step' parameter cannot be zero
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dotnet_diagnostic.NUnit1036.severity = error # Range: from < to when step is positive
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dotnet_diagnostic.NUnit1037.severity = error # Range: from > to when step is negative
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dotnet_diagnostic.NUnit1038.severity = error # Attribute values' types must match parameter type
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# Assertion Rules (NUnit2001 - )
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dotnet_diagnostic.NUnit2001.severity = error # Prefer Assert.That(..., Is.False) over ClassicAssert.False
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dotnet_diagnostic.NUnit2002.severity = error # Prefer Assert.That(..., Is.False) over ClassicAssert.IsFalse
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dotnet_diagnostic.NUnit2003.severity = error # Prefer Assert.That(..., Is.True) over ClassicAssert.IsTrue
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dotnet_diagnostic.NUnit2004.severity = error # Prefer Assert.That(..., Is.True) over ClassicAssert.True
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dotnet_diagnostic.NUnit2005.severity = error # Prefer Is.EqualTo over AreEqual
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dotnet_diagnostic.NUnit2006.severity = error # Prefer Is.Not.EqualTo over AreNotEqual
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dotnet_diagnostic.NUnit2007.severity = error # Actual value should not be a constant
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dotnet_diagnostic.NUnit2008.severity = error # Incorrect IgnoreCase usage
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dotnet_diagnostic.NUnit2009.severity = error # Same value used for actual and expected
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dotnet_diagnostic.NUnit2010.severity = error # Use EqualConstraint for better messages
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dotnet_diagnostic.NUnit2011.severity = error # Use ContainsConstraint for better messages
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dotnet_diagnostic.NUnit2012.severity = error # Use StartsWithConstraint for better messages
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dotnet_diagnostic.NUnit2013.severity = error # Use EndsWithConstraint for better messages
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dotnet_diagnostic.NUnit2014.severity = error # Use SomeItemsConstraint for better messages
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dotnet_diagnostic.NUnit2015.severity = error # Prefer Is.SameAs over AreSame
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dotnet_diagnostic.NUnit2016.severity = error # Prefer Is.Null over ClassicAssert.Null
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dotnet_diagnostic.NUnit2017.severity = error # Prefer Is.Null over ClassicAssert.IsNull
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dotnet_diagnostic.NUnit2018.severity = error # Prefer Is.Not.Null over ClassicAssert.NotNull
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dotnet_diagnostic.NUnit2019.severity = error # Prefer Is.Not.Null over ClassicAssert.IsNotNull
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dotnet_diagnostic.NUnit2020.severity = error # Incompatible types for SameAs constraint
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dotnet_diagnostic.NUnit2021.severity = error # Incompatible types for EqualTo constraint
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dotnet_diagnostic.NUnit2022.severity = error # Missing property required for constraint
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dotnet_diagnostic.NUnit2023.severity = error # Invalid NullConstraint usage
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dotnet_diagnostic.NUnit2024.severity = error # Wrong actual type with String constraint
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dotnet_diagnostic.NUnit2025.severity = error # Wrong actual type with ContainsConstraint
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dotnet_diagnostic.NUnit2026.severity = error # Wrong actual type with SomeItems+EqualConstraint
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dotnet_diagnostic.NUnit2027.severity = error # Prefer Is.GreaterThan over ClassicAssert.Greater
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dotnet_diagnostic.NUnit2028.severity = error # Prefer Is.GreaterThanOrEqualTo over GreaterOrEqual
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dotnet_diagnostic.NUnit2029.severity = error # Prefer Is.LessThan over ClassicAssert.Less
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dotnet_diagnostic.NUnit2030.severity = error # Prefer Is.LessThanOrEqualTo over LessOrEqual
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dotnet_diagnostic.NUnit2031.severity = error # Prefer Is.Not.SameAs over AreNotSame
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dotnet_diagnostic.NUnit2032.severity = error # Prefer Is.Zero over ClassicAssert.Zero
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dotnet_diagnostic.NUnit2033.severity = error # Prefer Is.Not.Zero over ClassicAssert.NotZero
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dotnet_diagnostic.NUnit2034.severity = error # Prefer Is.NaN over ClassicAssert.IsNaN
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dotnet_diagnostic.NUnit2035.severity = error # Prefer Is.Empty over ClassicAssert.IsEmpty
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dotnet_diagnostic.NUnit2036.severity = error # Prefer Is.Not.Empty over ClassicAssert.IsNotEmpty
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dotnet_diagnostic.NUnit2037.severity = error # Prefer Does.Contain over ClassicAssert.Contains
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dotnet_diagnostic.NUnit2038.severity = error # Prefer Is.InstanceOf over ClassicAssert.IsInstanceOf
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dotnet_diagnostic.NUnit2039.severity = error # Prefer Is.Not.InstanceOf over ClassicAssert.IsNotInstanceOf
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dotnet_diagnostic.NUnit2040.severity = error # Non-reference types for SameAs constraint
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dotnet_diagnostic.NUnit2041.severity = error # Incompatible types for comparison constraint
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dotnet_diagnostic.NUnit2042.severity = error # Comparison constraint on object
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dotnet_diagnostic.NUnit2043.severity = error # Use ComparisonConstraint for better messages
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dotnet_diagnostic.NUnit2044.severity = error # Non-delegate actual parameter
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dotnet_diagnostic.NUnit2045.severity = error # Use Assert.EnterMultipleScope or Assert.Multiple
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dotnet_diagnostic.NUnit2046.severity = error # Use CollectionConstraint for better messages
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dotnet_diagnostic.NUnit2047.severity = error # Incompatible types for Within constraint
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dotnet_diagnostic.NUnit2048.severity = error # Prefer Assert.That over StringAssert
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dotnet_diagnostic.NUnit2049.severity = error # Prefer Assert.That over CollectionAssert
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dotnet_diagnostic.NUnit2050.severity = error # NUnit 4 no longer supports string.Format spec
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dotnet_diagnostic.NUnit2051.severity = error # Prefer Is.Positive over ClassicAssert.Positive
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dotnet_diagnostic.NUnit2052.severity = error # Prefer Is.Negative over ClassicAssert.Negative
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dotnet_diagnostic.NUnit2053.severity = error # Prefer Is.AssignableFrom over ClassicAssert.IsAssignableFrom
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dotnet_diagnostic.NUnit2054.severity = error # Prefer Is.Not.AssignableFrom over ClassicAssert.IsNotAssignableFrom
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dotnet_diagnostic.NUnit2055.severity = error # Prefer Is.InstanceOf<T> over 'is T' expression
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dotnet_diagnostic.NUnit2056.severity = error # Prefer Assert.EnterMultipleScope statement over Multiple
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# Suppressor Rules (NUnit3001 - )
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dotnet_diagnostic.NUnit3001.severity = error # Expression checked in NotNull/IsNotNull/Assert.That
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dotnet_diagnostic.NUnit3002.severity = error # Field/Property initialized in SetUp/OneTimeSetUp
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dotnet_diagnostic.NUnit3003.severity = error # TestFixture instantiated via reflection
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dotnet_diagnostic.NUnit3004.severity = error # Field should be disposed in TearDown/OneTimeTearDown
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# Style Rules (NUnit4001 - )
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dotnet_diagnostic.NUnit4002.severity = error # Use Specific constraint

‎.gitignore‎

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# Fody Weavers (for tests)
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src/Tools/
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.dotnet/
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dotnet-install.sh

‎NUNIT_MIGRATION.md‎

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# Migration to NUnit 4.4.0 - Summary
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## Overview
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Successfully migrated ReactiveUI.Validation test suite from xUnit + FluentAssertions to NUnit 4.4.0.
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## Changes Made
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### 1. Package Updates (ReactiveUI.Validation.Tests.csproj)
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**Removed:**
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- `xunit` (2.9.3)
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- `xunit.runner.visualstudio` (3.1.4)
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- `xunit.runner.console` (2.9.3)
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- `Xunit.StaFact` (1.2.69)
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- `FluentAssertions` (8.6.0)
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- `Verify.Xunit` (30.10.0)
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**Added:**
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- `NUnit` (4.4.0)
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- `NUnit3TestAdapter` (5.*)
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- `Verify.NUnit` (30.*)
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**Updated:**
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- `DiffEngine` (16.2.3 → 16.*)
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- `Microsoft.NET.Test.Sdk` (already at 17.14.1)
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### 2. Parallelization Configuration
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**Created `AssemblyInfo.Parallel.cs`:**
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```csharp
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[assembly: Parallelizable(ParallelScope.Fixtures)]
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[assembly: LevelOfParallelism(4)]
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```
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- Tests run sequentially within each fixture
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- Parallel execution across different fixtures
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- 4 parallel workers
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**Created `tests.runsettings`:**
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```xml
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<RunSettings>
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<NUnit>
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<NumberOfTestWorkers>4</NumberOfTestWorkers>
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</NUnit>
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</RunSettings>
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```
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### 3. Test File Migrations
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All test files migrated from xUnit to NUnit:
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1. **ApiApprovalTests.cs** - Changed from `[Fact]` to `[Test]`, updated to use `Verify.NUnit`
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2. **ApiExtensions.cs** - Updated imports to use `VerifyNUnit`
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3. **MemoryLeakTests.cs** - Converted assertions, replaced `ITestOutputHelper` with `TestContext.WriteLine`
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4. **NotifyDataErrorInfoTests.cs** - Converted all xUnit assertions to NUnit `Assert.That()` style
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5. **ObservableValidationTests.cs** - Added `[SetUp]` method, converted field initialization
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6. **PropertyValidationTests.cs** - Converted assertions, added `Assert.Multiple()` for grouped assertions
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7. **ValidationBindingTests.cs** - Converted all assertions to NUnit constraints
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8. **ValidationContextTests.cs** - Converted assertions with extensive use of `Assert.Multiple()`
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9. **ValidationTextTests.cs** - Converted assertions with `Assert.Multiple()`
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### 4. Assertion Conversions
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**From xUnit/FluentAssertions to NUnit:**
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| Old Syntax | New Syntax |
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|------------|-----------|
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| `Assert.True(x)` | `Assert.That(x, Is.True)` |
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| `Assert.False(x)` | `Assert.That(x, Is.False)` |
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| `Assert.Equal(a, b)` | `Assert.That(b, Is.EqualTo(a))` |
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| `Assert.Same(a, b)` | `Assert.That(b, Is.SameAs(a))` |
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| `Assert.Null(x)` | `Assert.That(x, Is.Null)` |
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| `Assert.Empty(x)` | `Assert.That(x, Is.Empty)` |
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| `Assert.Single(x)` | `Assert.That(x, Has.Count.EqualTo(1))` |
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| `x.Should().Be(y)` | `Assert.That(x, Is.EqualTo(y))` |
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| `x.Should().BeTrue()` | `Assert.That(x, Is.True)` |
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| `x.Should().BeFalse()` | `Assert.That(x, Is.False)` |
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**Key Improvements:**
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- Used `Assert.Multiple()` to group related assertions
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- Used proper NUnit constraints (e.g., `Is.GreaterThan`, `Is.Empty`, `Has.Count`)
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- Converted comparison operations to use `.Count()` where needed for `IEnumerable<T>`
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### 5. Files Removed
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- `xunit.runner.json` - No longer needed with NUnit
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## Test Results
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### All Tests Passing ✅
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```
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Passed! - Failed: 0, Passed: 68, Skipped: 0, Total: 68
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```
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**Tested on:**
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- ✅ net8.0 (Duration: 368 ms)
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- ✅ net9.0 (Duration: 589 ms)
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## Key Takeaways
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1. **Parallelization Strategy**: Tests within each fixture run sequentially (to handle ReactiveUI's static state), but different fixtures can run in parallel.
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2. **Assert.Multiple()**: Extensively used for grouping related assertions, improving test readability and failure reporting.
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3. **Constraint Model**: Full adoption of NUnit's constraint model (`Assert.That()`) provides more readable and maintainable test code.
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4. **No Breaking Changes**: All existing test logic preserved; only the testing framework and assertion syntax changed.
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5. **Performance**: Similar test execution times compared to xUnit baseline.
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## Running Tests
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**Standard run:**
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```bash
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dotnet test --settings tests.runsettings
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```
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**Force full serialization (if needed):**
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```bash
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dotnet test -- NUnit.NumberOfTestWorkers=1
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```
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**Target specific framework:**
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```bash
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dotnet test -f net8.0 --settings tests.runsettings
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```

‎global.json‎

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{
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"sdk": {
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"version": "9.0.305",
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"rollForward": "latestMinor"
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}
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}

‎src/ReactiveUI.Validation.Tests/API/ApiApprovalTests.cs‎

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using System.Diagnostics.CodeAnalysis;
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using System.Threading.Tasks;
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using NUnit.Framework;
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using ReactiveUI.Validation.APITests;
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using ReactiveUI.Validation.ValidationBindings;
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using VerifyXunit;
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using Xunit;
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using VerifyNUnit;
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/// <summary>
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/// Tests to make sure that the API matches the approved ones.
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/// </summary>
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[ExcludeFromCodeCoverage]
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[TestFixture]
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public class ApiApprovalTests
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{
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/// <summary>
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/// Tests to make sure the splat project is approved.
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/// </summary>
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/// <returns>A <see cref="Task"/> representing the asynchronous unit test.</returns>
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[Fact]
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public Task ValidationProject() => typeof(ValidationBinding).Assembly.CheckApproval(["ReactiveUI.Validation"]);
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[Test]
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public Task ValidationProject() => typeof(ValidationBinding).Assembly.CheckApproval([" ReactiveUI.Validation"]);
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}

‎src/ReactiveUI.Validation.Tests/API/ApiExtensions.cs‎

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using System.Runtime.CompilerServices;
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using System.Threading.Tasks;
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using PublicApiGenerator;
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using VerifyXunit;
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using VerifyNUnit;
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‎src/ReactiveUI.Validation.Tests/AssemblyInfo.Parallel.cs‎

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// Copyright (c) 2021 .NET Foundation and Contributors. All rights reserved.
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for full license information.
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using NUnit.Framework;
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[assembly: Parallelizable(ParallelScope.Fixtures)]
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[assembly: LevelOfParallelism(4)]

‎src/ReactiveUI.Validation.Tests/MemoryLeakTests.cs‎

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// See the LICENSE file in the project root for full license information.
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using System;
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using FluentAssertions;
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using JetBrains.dotMemoryUnit;
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using NUnit.Framework;
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using ReactiveUI.Validation.Tests.Models;
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using Xunit;
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using Xunit.Abstractions;
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/// <summary>
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/// MemoryLeakTests.
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/// </summary>
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[TestFixture]
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public class MemoryLeakTests
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="MemoryLeakTests"/> class.
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/// </summary>
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/// <param name="testOutputHelper">The test output helper.</param>
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public MemoryLeakTests(ITestOutputHelper testOutputHelper)
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[SetUp]
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public void SetUp()
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{
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ArgumentNullException.ThrowIfNull(testOutputHelper);
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DotMemoryUnitTestOutput.SetOutputMethod(testOutputHelper.WriteLine);
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DotMemoryUnitTestOutput.SetOutputMethod(TestContext.WriteLine);
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/// <summary>Tests whether the created object can be garbage collected.</summary>
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[Fact]
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[Test]
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public void Instance_Released_IsGarbageCollected()
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dotMemory.Check(
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memory => memory.GetObjects(
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where => where.Type.Is<TestClassMemory>()).ObjectsCount.Should().Be(0, "it is out of scope"));
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memory => Assert.That(
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Is.Zero,
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"it is out of scope"));
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reference.IsAlive.Should().BeFalse("it is garbage collected");
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}
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}

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