feat: expose hidden base-interface members via Mock.As<TBase>()

[vbreuss]

When a derived interface hides a base member with new, the hidden base slot was unreachable from the setup/verify surface. The mock now also implements the base interface's IMockSetupFor.../IMockVerifyFor... surfaces, so IDerived.CreateMock().Mock.As() can configure and verify the hidden slot without an explicit Implementing<>() call.

Methods, properties and events get separate base/derived slots; indexers share storage by parameter signature. Bases with static members are out of scope.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
2 Accepted issues

Measures
0 Security Hotspots
87.8% Coverage on New Code
6.9% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test Results

    24 files  ± 0      24 suites  ±0   8m 50s ⏱️ - 1m 18s
 4 154 tests + 4   4 152 ✅ + 4  2 💤 ±0  0 ❌ ±0 
26 726 runs  +28  26 722 ✅ +28  4 💤 ±0  0 ❌ ±0 

Results for commit 88c81db. ± Comparison against base commit a751598.

[github-actions]

🚀 Benchmark Results

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 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Callback	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	327.5 ns	4.83 ns	4.28 ns	1.03	1.68 KB	1.00
Mockolate	317.2 ns	3.02 ns	2.82 ns	1.00	1.68 KB	1.00
Imposter	390.1 ns	1.07 ns	0.95 ns	1.23	2.38 KB	1.42
TUnitMocks	516.0 ns	2.85 ns	2.66 ns	1.63	1.99 KB	1.19
Moq	72,377.2 ns	424.98 ns	376.74 ns	228.18	8.88 KB	5.29
NSubstitute	4,053.5 ns	12.59 ns	10.52 ns	12.78	7.74 KB	4.61
FakeItEasy	4,196.4 ns	15.83 ns	14.81 ns	13.23	6.81 KB	4.05

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 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Indexer	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	1,077.0 ns	28.18 ns	26.36 ns	1.09	3.82 KB	1.00
Mockolate	1	983.8 ns	39.09 ns	36.56 ns	1.00	3.82 KB	1.00
Imposter	1	963.9 ns	33.52 ns	29.71 ns	0.98	5.16 KB	1.35
Moq	1	217,615.8 ns	938.80 ns	832.22 ns	221.49	20.32 KB	5.32
NSubstitute	1	9,235.8 ns	82.41 ns	73.06 ns	9.40	12.78 KB	3.35
FakeItEasy	1	12,366.2 ns	72.41 ns	67.74 ns	12.59	13.63 KB	3.57
baseline*	10	2,575.0 ns	13.79 ns	11.51 ns	1.03	4.88 KB	1.00
Mockolate	10	2,509.7 ns	23.29 ns	21.79 ns	1.00	4.88 KB	1.00
Imposter	10	2,189.5 ns	36.07 ns	33.74 ns	0.87	7.97 KB	1.63
Moq	10	228,496.8 ns	996.59 ns	883.45 ns	91.05	28.72 KB	5.89
NSubstitute	10	22,587.4 ns	162.72 ns	144.25 ns	9.00	25.58 KB	5.25
FakeItEasy	10	25,117.3 ns	160.76 ns	142.51 ns	10.01	32.97 KB	6.76

Details

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

AMD EPYC 9V74 2.87GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Property	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	518.8 ns	26.54 ns	24.82 ns	0.89	2.47 KB	1.00
Mockolate	1	584.7 ns	10.40 ns	9.73 ns	1.00	2.47 KB	1.00
Imposter	1	434.8 ns	6.52 ns	5.78 ns	0.74	3.13 KB	1.27
TUnitMocks	1	490.7 ns	4.71 ns	3.93 ns	0.84	1.64 KB	0.66
Moq	1	10,774.1 ns	125.09 ns	117.01 ns	18.43	10.39 KB	4.21
NSubstitute	1	6,919.0 ns	61.51 ns	57.53 ns	11.84	11.45 KB	4.64
FakeItEasy	1	7,472.7 ns	155.87 ns	145.80 ns	12.78	11.24 KB	4.55
baseline*	10	993.3 ns	5.87 ns	5.21 ns	0.88	2.96 KB	1.00
Mockolate	10	1,134.5 ns	37.37 ns	34.95 ns	1.00	2.96 KB	1.00
Imposter	10	1,084.0 ns	7.01 ns	6.55 ns	0.96	4.67 KB	1.58
TUnitMocks	10	1,650.7 ns	18.02 ns	16.86 ns	1.46	3.94 KB	1.33
Moq	10	17,135.1 ns	229.92 ns	203.81 ns	15.12	18.28 KB	6.17
NSubstitute	10	15,682.9 ns	290.86 ns	272.07 ns	13.84	21.08 KB	7.12
FakeItEasy	10	18,091.3 ns	434.31 ns	406.25 ns	15.96	30.81 KB	10.40

Details

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

AMD EPYC 9V74 2.81GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Event	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	332.2 ns	12.33 ns	11.54 ns	1.03	1.78 KB	1.00
Mockolate	323.9 ns	5.40 ns	5.05 ns	1.00	1.78 KB	1.00
Imposter	1,313.5 ns	21.01 ns	19.65 ns	4.06	8.8 KB	4.94
TUnitMocks	174.1 ns	3.79 ns	3.54 ns	0.54	1.34 KB	0.75
Moq	14,510.8 ns	172.91 ns	153.28 ns	44.81	12.51 KB	7.02
NSubstitute	5,343.3 ns	171.30 ns	160.24 ns	16.50	9.05 KB	5.08
FakeItEasy	231,537.2 ns	1,787.08 ns	1,584.20 ns	714.95	15.26 KB	8.57

Details

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

Intel Xeon Platinum 8370C CPU 2.80GHz (Max: 3.39GHz), 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	430.3 ns	11.21 ns	10.49 ns	1.01	2.04 KB	1.00
Mockolate	1	425.4 ns	8.21 ns	7.28 ns	1.00	2.04 KB	1.00
Imposter	1	629.2 ns	14.32 ns	13.39 ns	1.48	4.04 KB	1.98
TUnitMocks	1	585.4 ns	6.91 ns	6.46 ns	1.38	2.02 KB	0.99
Moq	1	137,163.3 ns	386.77 ns	342.86 ns	322.54	14.59 KB	7.15
NSubstitute	1	6,265.2 ns	28.94 ns	27.07 ns	14.73	9.12 KB	4.47
FakeItEasy	1	5,986.1 ns	47.13 ns	44.08 ns	14.08	8.06 KB	3.95
baseline*	10	700.5 ns	15.38 ns	14.39 ns	0.82	2.25 KB	1.00
Mockolate	10	859.4 ns	5.52 ns	5.16 ns	1.00	2.25 KB	1.00
Imposter	10	1,276.9 ns	25.44 ns	23.80 ns	1.49	5.52 KB	2.45
TUnitMocks	10	1,774.0 ns	10.18 ns	9.52 ns	2.06	3.73 KB	1.66
Moq	10	143,111.3 ns	739.58 ns	691.80 ns	166.54	18.49 KB	8.22
NSubstitute	10	9,311.0 ns	31.38 ns	27.82 ns	10.84	12.07 KB	5.36
FakeItEasy	10	9,595.0 ns	60.05 ns	53.23 ns	11.17	15.42 KB	6.85

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 10.0.301

[Host] : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

CreateMock	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	66.19 ns	0.972 ns	0.909 ns	0.96	440 B	1.00
Mockolate	68.66 ns	2.735 ns	2.558 ns	1.00	440 B	1.00
Imposter	268.14 ns	7.489 ns	7.005 ns	3.91	2248 B	5.11
TUnitMocks	35.97 ns	1.607 ns	1.503 ns	0.52	200 B	0.45
Moq	1,461.30 ns	18.768 ns	17.555 ns	21.31	2096 B	4.76
NSubstitute	2,046.24 ns	30.723 ns	27.235 ns	29.84	5048 B	11.47
FakeItEasy	1,803.88 ns	58.948 ns	55.140 ns	26.31	2763 B	6.28

baseline* rows show the corresponding Mockolate benchmark from the most recent successful main branch build with results, for regression comparison.

[github-actions]

This is addressed in release v3.3.0.