refactor: migrate to TUnit

[vbreuss]

This PR migrates the test framework from xUnit to TUnit by replacing test attributes and updating helper utilities.

Key Changes

• Replaced [Fact] attributes with [Test] throughout test files
• Replaced [Theory]/[InlineData] with [Test]/[Arguments] for parameterized tests
• Changed global using from Xunit to TUnit in the test helpers
• Added a new Record helper class to replace xUnit's Record.Exception functionality
• Updated assertion syntax in delegate tests to use aweXpect instead of xUnit assertions
• Uses the latest Stryker version that supports MTP

---

• Try again migration of refactor: migrate to TUnit #223, that was reverted in revert: migrate to TUnit #505

[github-actions]

Test Results

21 files ± 0 21 suites ±0 25m 15s ⏱️ + 15m 42s
3 849 tests - 11 3 837 ✅ - 21 0 💤 - 2 12 ❌ +12 
25 090 runs - 4 25 012 ✅ - 78 0 💤 - 4 78 ❌ +78 

For more details on these failures, see this check.

Results for commit 74ff11c. ± Comparison against base commit c12680a.

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

AMD EPYC 7763 2.46GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.203

[Host] : .NET 10.0.7 (10.0.7, 10.0.726.21808), X64 RyuJIT x86-64-v3
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=15

LaunchCount=1 WarmupCount=10

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Event_Mockolate	408.5 ns	10.95 ns	10.24 ns	1.00	0.03	0.1254	0.0005	2.05 KB	1.00
Event_Moq	17,635.9 ns	153.48 ns	128.16 ns	43.20	1.09	0.7324	-	12.51 KB	6.09
Event_NSubstitute	6,527.8 ns	127.28 ns	119.06 ns	15.99	0.48	0.5493	0.0076	9.05 KB	4.40
Event_FakeItEasy	222,978.6 ns	975.88 ns	865.09 ns	546.20	13.34	0.4883	-	15.35 KB	7.47
Event_Imposter	1,697.4 ns	43.02 ns	40.24 ns	4.16	0.14	0.5379	0.0153	8.8 KB	4.29
Event_TUnitMocks	212.1 ns	3.64 ns	3.23 ns	0.52	0.01	0.0818	0.0002	1.34 KB	0.65

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.203

[Host] : .NET 10.0.7 (10.0.7, 10.0.726.21808), X64 RyuJIT x86-64-v4
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=15

LaunchCount=1 WarmupCount=10

Method	N	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Indexer_Mockolate	1	996.5 ns	7.01 ns	6.21 ns	1.00	0.01	0.1640	-	4.03 KB	1.00
Indexer_Moq	1	163,660.7 ns	1,431.44 ns	1,338.97 ns	164.24	1.63	0.4883	-	20.36 KB	5.05
Indexer_NSubstitute	1	9,002.7 ns	58.40 ns	54.63 ns	9.03	0.08	0.5188	-	12.78 KB	3.17
Indexer_FakeItEasy	1	10,286.9 ns	79.59 ns	74.45 ns	10.32	0.10	0.5646	0.0153	13.87 KB	3.44
Indexer_Imposter	1	885.4 ns	5.98 ns	5.30 ns	0.89	0.01	0.2098	0.0029	5.16 KB	1.28
Indexer_Mockolate	10	2,768.8 ns	9.52 ns	7.95 ns	1.00	0.00	0.2060	-	5.09 KB	1.00
Indexer_Moq	10	170,939.6 ns	682.26 ns	604.80 ns	61.74	0.27	0.9766	0.7324	29.89 KB	5.88
Indexer_NSubstitute	10	21,311.8 ns	129.68 ns	114.96 ns	7.70	0.05	1.0376	0.0305	25.58 KB	5.03
Indexer_FakeItEasy	10	21,995.2 ns	114.17 ns	106.79 ns	7.94	0.04	1.4343	0.0610	35.48 KB	6.98
Indexer_Imposter	10	2,106.8 ns	10.91 ns	10.21 ns	0.76	0.00	0.3242	-	7.97 KB	1.57

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.203

[Host] : .NET 10.0.7 (10.0.7, 10.0.726.21808), X64 RyuJIT x86-64-v3
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=15

LaunchCount=1 WarmupCount=10

Method	N	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Method_Mockolate	1	466.7 ns	4.04 ns	3.78 ns	1.00	0.01	0.1416	0.0010	2.32 KB	1.00
Method_Moq	1	182,091.0 ns	498.50 ns	416.27 ns	390.23	3.18	0.4883	-	14.58 KB	6.28
Method_NSubstitute	1	5,947.7 ns	25.60 ns	22.69 ns	12.75	0.11	0.5569	0.0076	9.12 KB	3.93
Method_FakeItEasy	1	6,296.6 ns	29.93 ns	23.37 ns	13.49	0.12	0.4959	-	8.11 KB	3.50
Method_Imposter	1	632.5 ns	15.02 ns	14.05 ns	1.36	0.03	0.2470	0.0029	4.04 KB	1.74
Method_TUnitMocks	1	466.7 ns	10.23 ns	9.07 ns	1.00	0.02	0.1149	0.0005	1.88 KB	0.81
Method_Mockolate	10	778.0 ns	9.59 ns	8.97 ns	1.00	0.02	0.1545	0.0010	2.53 KB	1.00
Method_Moq	10	187,873.4 ns	934.18 ns	828.13 ns	241.52	2.89	0.9766	0.7324	18.48 KB	7.30
Method_NSubstitute	10	8,865.7 ns	105.50 ns	93.52 ns	11.40	0.17	0.7324	0.0153	12.07 KB	4.77
Method_FakeItEasy	10	9,501.6 ns	76.80 ns	71.84 ns	12.21	0.16	0.9766	0.0305	16.05 KB	6.34
Method_Imposter	10	1,229.5 ns	35.70 ns	33.39 ns	1.58	0.05	0.3376	0.0057	5.52 KB	2.18
Method_TUnitMocks	10	1,317.8 ns	17.02 ns	15.92 ns	1.69	0.03	0.2155	0.0019	3.52 KB	1.39

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.203

[Host] : .NET 10.0.7 (10.0.7, 10.0.726.21808), X64 RyuJIT x86-64-v4
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=15

LaunchCount=1 WarmupCount=10

Method	N	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Property_Mockolate	1	644.8 ns	6.56 ns	6.14 ns	1.00	0.01	0.1049	-	2.58 KB	1.00
Property_Moq	1	10,818.1 ns	43.47 ns	38.54 ns	16.78	0.16	0.3662	-	10.39 KB	4.03
Property_NSubstitute	1	7,767.8 ns	23.29 ns	20.65 ns	12.05	0.12	0.4578	-	11.45 KB	4.44
Property_FakeItEasy	1	8,228.2 ns	43.23 ns	38.32 ns	12.76	0.13	0.4578	-	11.25 KB	4.36
Property_Imposter	1	542.7 ns	7.52 ns	7.04 ns	0.84	0.01	0.1268	0.0010	3.13 KB	1.21
Property_TUnitMocks	1	494.1 ns	3.41 ns	3.19 ns	0.77	0.01	0.0601	-	1.49 KB	0.58
Property_Mockolate	10	1,348.0 ns	6.67 ns	6.24 ns	1.00	0.01	0.1240	-	3.07 KB	1.00
Property_Moq	10	17,416.9 ns	29.40 ns	24.55 ns	12.92	0.06	0.7324	-	18.28 KB	5.95
Property_NSubstitute	10	16,848.2 ns	40.28 ns	37.67 ns	12.50	0.06	0.8545	-	21.08 KB	6.87
Property_FakeItEasy	10	19,572.7 ns	65.71 ns	61.47 ns	14.52	0.08	1.2512	0.0305	30.8 KB	10.03
Property_Imposter	10	1,423.5 ns	19.41 ns	18.15 ns	1.06	0.01	0.1888	0.0019	4.67 KB	1.52
Property_TUnitMocks	10	1,754.6 ns	6.56 ns	6.14 ns	1.30	0.01	0.1488	-	3.65 KB	1.19

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

AMD EPYC 7763 2.76GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.203

[Host] : .NET 10.0.7 (10.0.7, 10.0.726.21808), X64 RyuJIT x86-64-v3
Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=15

LaunchCount=1 WarmupCount=10

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Callback_Mockolate	408.9 ns	6.48 ns	5.41 ns	1.00	0.02	0.1197	-	1.96 KB	1.00
Callback_Moq	98,122.6 ns	883.92 ns	826.82 ns	240.03	3.59	0.4883	0.2441	8.88 KB	4.53
Callback_NSubstitute	4,289.3 ns	33.23 ns	29.46 ns	10.49	0.15	0.4730	0.0076	7.74 KB	3.95
Callback_FakeItEasy	4,741.8 ns	67.17 ns	59.54 ns	11.60	0.20	0.4120	0.0153	6.81 KB	3.47
Callback_Imposter	397.7 ns	5.54 ns	4.33 ns	0.97	0.02	0.1454	0.0010	2.38 KB	1.22
Callback_TUnitMocks	446.6 ns	10.29 ns	9.62 ns	1.09	0.03	0.1135	0.0005	1.86 KB	0.95