coverage: add missing tests for It.*

[vbreuss]

This pull request adds new unit tests to improve coverage and ensure correct behavior of the It.IsNull, It.IsNotNull, and It.SequenceEquals parameter matchers in the Mockolate testing framework. The most important changes include verifying the use of shared instances, correct string representations, handling of nulls in sequences, and support for multiple callbacks.

Parameter matcher instance behavior:

• Added tests to verify that It.IsNull<string>() and It.IsNotNull<string>() return shared instances when ToString() is not called, ensuring consistent identity semantics.

String representation and null handling:

• Added a test to It.SequenceEquals<object?> to ensure that the string representation correctly renders null elements as null tokens in the output.

Callback registration and invocation:

• Added a test to verify that multiple callbacks registered with ISequenceEqualsParameter<int> are all invoked when the matcher is triggered, improving confidence in the callback mechanism.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🚀 Benchmark Results

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	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
Event_Mockolate	365.5 ns	2.73 ns	2.56 ns	1.00	0.01	0.1254	0.0005	2.05 KB	1.00
Event_Moq	16,023.3 ns	64.40 ns	53.78 ns	43.85	0.33	0.7324	-	12.51 KB	6.09
Event_NSubstitute	5,513.2 ns	19.88 ns	18.59 ns	15.09	0.11	0.5493	0.0076	9.05 KB	4.40
Event_FakeItEasy	212,258.9 ns	585.49 ns	519.02 ns	580.81	4.17	0.7324	0.4883	15.39 KB	7.49
Event_Imposter	1,390.6 ns	12.26 ns	10.87 ns	3.81	0.04	0.5379	0.0153	8.8 KB	4.29
Event_TUnitMocks	182.2 ns	1.69 ns	1.58 ns	0.50	0.01	0.0837	0.0002	1.37 KB	0.67

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
Indexer_Mockolate	1	962.3 ns	9.72 ns	8.62 ns	1.00	0.01	0.2460	0.0019	4.03 KB	1.00
Indexer_Moq	1	217,309.1 ns	1,787.28 ns	1,671.82 ns	225.83	2.57	0.9766	0.4883	20.25 KB	5.02
Indexer_NSubstitute	1	9,431.5 ns	98.40 ns	87.23 ns	9.80	0.12	0.7782	-	12.78 KB	3.17
Indexer_FakeItEasy	1	11,773.3 ns	164.44 ns	153.82 ns	12.23	0.19	0.8392	0.0305	13.88 KB	3.44
Indexer_Imposter	1	1,017.7 ns	48.19 ns	45.08 ns	1.06	0.05	0.3147	0.0038	5.16 KB	1.28
Indexer_Mockolate	10	2,594.6 ns	29.92 ns	27.98 ns	1.00	0.01	0.3090	-	5.09 KB	1.00
Indexer_Moq	10	228,442.0 ns	1,040.39 ns	922.28 ns	88.05	0.98	1.7090	1.4648	28.64 KB	5.63
Indexer_NSubstitute	10	22,291.6 ns	216.48 ns	202.50 ns	8.59	0.12	1.5564	0.0305	25.58 KB	5.03
Indexer_FakeItEasy	10	25,373.4 ns	230.11 ns	215.25 ns	9.78	0.13	2.1667	0.0610	35.47 KB	6.97
Indexer_Imposter	10	2,236.4 ns	82.22 ns	76.91 ns	0.86	0.03	0.4845	0.0076	7.97 KB	1.57

Details

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

AMD EPYC 7763 2.81GHz, 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	491.6 ns	7.03 ns	6.57 ns	1.00	0.02	0.1411	0.0010	2.32 KB	1.00
Method_Moq	1	183,447.2 ns	1,082.42 ns	1,012.50 ns	373.23	5.26	0.4883	-	15.01 KB	6.47
Method_NSubstitute	1	5,886.8 ns	69.29 ns	57.86 ns	11.98	0.19	0.5569	0.0076	9.12 KB	3.93
Method_FakeItEasy	1	6,010.3 ns	63.99 ns	59.85 ns	12.23	0.20	0.4959	-	8.11 KB	3.50
Method_Imposter	1	596.6 ns	15.62 ns	14.61 ns	1.21	0.03	0.2470	0.0029	4.04 KB	1.74
Method_TUnitMocks	1	685.7 ns	9.62 ns	8.53 ns	1.40	0.02	0.1774	0.0010	2.9 KB	1.25
Method_Mockolate	10	754.6 ns	11.58 ns	10.83 ns	1.00	0.02	0.1545	0.0010	2.53 KB	1.00
Method_Moq	10	187,122.0 ns	516.73 ns	483.35 ns	248.03	3.49	0.9766	0.7324	18.92 KB	7.47
Method_NSubstitute	10	8,703.3 ns	121.56 ns	113.71 ns	11.54	0.22	0.7324	0.0153	12.07 KB	4.77
Method_FakeItEasy	10	9,452.1 ns	97.71 ns	91.39 ns	12.53	0.21	0.9766	0.0305	16.05 KB	6.34
Method_Imposter	10	1,233.5 ns	24.71 ns	23.11 ns	1.64	0.04	0.3376	0.0057	5.52 KB	2.18
Method_TUnitMocks	10	1,701.1 ns	27.89 ns	26.09 ns	2.25	0.05	0.2747	0.0019	4.49 KB	1.77

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
Property_Mockolate	1	584.4 ns	12.71 ns	11.89 ns	1.00	0.03	0.1574	0.0010	2.58 KB	1.00
Property_Moq	1	11,967.4 ns	164.55 ns	153.92 ns	20.48	0.48	0.6104	-	10.39 KB	4.03
Property_NSubstitute	1	7,773.2 ns	115.29 ns	107.85 ns	13.31	0.32	0.6866	-	11.45 KB	4.44
Property_FakeItEasy	1	8,830.4 ns	53.52 ns	50.07 ns	15.11	0.31	0.6866	-	11.24 KB	4.36
Property_Imposter	1	505.7 ns	6.29 ns	5.57 ns	0.87	0.02	0.1907	0.0019	3.13 KB	1.21
Property_TUnitMocks	1	815.2 ns	13.06 ns	12.21 ns	1.40	0.03	0.1526	0.0010	2.51 KB	0.97
Property_Mockolate	10	1,129.4 ns	18.38 ns	17.19 ns	1.00	0.02	0.1869	-	3.07 KB	1.00
Property_Moq	10	19,208.0 ns	40.09 ns	35.53 ns	17.01	0.25	1.0986	-	18.28 KB	5.95
Property_NSubstitute	10	17,978.7 ns	56.31 ns	49.91 ns	15.92	0.24	1.2817	0.0305	21.08 KB	6.87
Property_FakeItEasy	10	20,736.2 ns	145.03 ns	135.66 ns	18.36	0.30	1.8616	-	30.81 KB	10.03
Property_Imposter	10	1,332.1 ns	15.72 ns	13.13 ns	1.18	0.02	0.2842	0.0019	4.67 KB	1.52
Property_TUnitMocks	10	2,320.3 ns	12.31 ns	10.91 ns	2.05	0.03	0.2823	-	4.66 KB	1.52

Details

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

AMD EPYC 9V74 2.60GHz, 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	416.1 ns	9.67 ns	8.57 ns	1.00	0.03	0.1197	-	1.96 KB	1.00
Callback_Moq	70,712.8 ns	522.36 ns	436.19 ns	170.03	3.63	0.4883	0.2441	8.88 KB	4.53
Callback_NSubstitute	4,272.0 ns	96.34 ns	90.11 ns	10.27	0.30	0.4730	0.0076	7.74 KB	3.95
Callback_FakeItEasy	4,449.9 ns	131.01 ns	122.54 ns	10.70	0.36	0.4120	0.0153	6.81 KB	3.47
Callback_Imposter	426.1 ns	7.24 ns	6.42 ns	1.02	0.03	0.1454	0.0010	2.38 KB	1.22
Callback_TUnitMocks	660.0 ns	8.82 ns	7.82 ns	1.59	0.04	0.1602	0.0010	2.63 KB	1.34