[dependabot]

Updated Imposter from 1.0.7 to 1.0.9.

Release notes

Sourced from Imposter's releases.

1.0.9

Performance

• Removing or inserting a registration no longer rebuilds the imposters after it (#​440, closes #​408). The driver compares registered targets by position, so removing or inserting one [assembly: GenerateImposter(...)] regenerated every imposter registered after it, even though none of them changed. The generator now reuses a source when its target and C# version haven't changed. In a project with 20 targets of 30 members each, removing the first registration now takes 4 ms in the generator, down from 477 ms. The generated code is unchanged.

• Method Throws setups allocate one closure instead of two (#​441, closes #​437). The setup step wrapped the builder's throwing lambda in a second one. It now uses that lambda directly. Per setup:

  Setup	1.0.8	1.0.9
  Throws(exception)	472 B	384 B
  Throws(_ => exception)	472 B	384 B
  Throws<InvalidOperationException>()	384 B	296 B

  Throws<TException>() captures nothing, so its setup no longer allocates any closure.

1.0.8

Performance

• Method setups no longer allocate queues or take a lock (#​438, closes #​405). Each method setup used to create two ConcurrentQueues, and each Then() step another. Until the steps ran out, every call also took a lock to advance them. Steps now live in a lock-free ReturnValueSequence, and callbacks in a list created on the first Callback. Indexer getter return values use the same sequence, as property getters already did. Per setup:

  Setup	1.0.7	1.0.8
  Returns(4)	1,949 B	389 B
  Returns(1).Then().Returns(2).Then().Returns(3)	3,864 B	720 B
  Throws(exception)	2,032 B	472 B
  Returns(4).Callback(...)	1,944 B	440 B
  indexer Getter().Returns(5)	1,208 B	480 B

  A call that runs a callback now allocates 96 B instead of 168 B, the same as a call without one.

• Generic methods skip type adaptation when the type arguments already match (#​433, closes #​401). Verification no longer converts the criteria once per recorded call, so verifying against 1,000 recorded calls costs the same as against one. A matched Echo<string> call with two setups allocates at most 120 B, down from 216 B.

• Edits rebuild less of each target's model (#​436, closes #​403). On every edit, the generator rebuilt or recompared several parts of each registered target's model. An edit with 20 registered targets now allocates about 25% less in the generator, for example 4.0 MB instead of 5.4 MB. The generated code is unchanged.

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[github-actions]

Test Results

    31 files  ±0      31 suites  ±0   53m 9s ⏱️ + 3m 1s
 4 529 tests ±0   4 529 ✅ ±0  0 💤 ±0  0 ❌ ±0 
28 808 runs  ±0  28 808 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 2764440. ± Comparison against base commit 7560c9f.

This pull request removes 22 and adds 16 tests. Note that renamed tests count towards both.

 x-myHeader3: baz, True)
)
Mockolate.Internal.Tests.Internals.WildcardTests ‑ ShouldSupportMultilineStrings(
Mockolate.Internal.Tests.Internals.WildcardTests ‑ ShouldSupportMultilineStrings(
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(bool Equals(object obj);
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(bool Equals(object obj);
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
Mockolate.Tests.Web.ItExtensionsTests+IsHttpContentTests+WithHeadersTests ‑ ShouldVerifyStringHeaders(x-myHeader1 : foo
Mockolate.Tests.Web.ItExtensionsTests+IsHttpContentTests+WithHeadersTests ‑ ShouldVerifyStringHeaders(x-myHeader1 : foo
…

Mockolate.Internal.Tests.Internals.WildcardTests ‑ ShouldSupportMultilineStrings(
)
Mockolate.Internal.Tests.Internals.WildcardTests ‑ ShouldSupportMultilineStrings(
)
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(bool Equals(object obj);
int GetHashCode();, public override bool Equals(object obj), public override int GetHashCode())
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(bool Equals(object obj);
int GetHashCode();, public override bool Equals(object obj), public override int GetHashCode())
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
bool Equals(object obj);, public override string ToString(), public override bool Equals(object obj))
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
bool Equals(object? obj);
int GetHashCode();, public override string ToString(), public override int GetHashCode(), public override bool Equals(object? obj))
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
int GetHashCode();, public override string ToString(), public override int GetHashCode())
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
bool Equals(object obj);, public override string ToString(), public override bool Equals(object obj))
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
bool Equals(object? obj);
int GetHashCode();, public override string ToString(), public override int GetHashCode(), public override bool Equals(object? obj))
Mockolate.SourceGenerators.Tests.MethodSetupsTests ‑ WhenImplementingObjectMethods_ShouldUseSpecialInterfaces(string ToString();
int GetHashCode();, public override string ToString(), public override int GetHashCode())
…

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

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

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	389.1 ns	8.93 ns	8.35 ns	1.09	1.93 KB	1.00
Mockolate	1	356.8 ns	5.79 ns	5.14 ns	1.00	1976 B	1.00
Imposter	1	242.2 ns	1.10 ns	0.98 ns	0.68	928 B	0.47
TUnitMocks	1	496.4 ns	3.21 ns	2.84 ns	1.39	2088 B	1.06
Moq	1	136,490.1 ns	444.53 ns	394.07 ns	382.62	15098 B	7.64
NSubstitute	1	5,966.0 ns	30.69 ns	28.71 ns	16.72	9336 B	4.72
FakeItEasy	1	5,523.1 ns	53.31 ns	49.87 ns	15.48	8244 B	4.17
baseline*	10	661.8 ns	5.48 ns	4.86 ns	1.04	2.14 KB	1.00
Mockolate	10	634.9 ns	9.05 ns	8.46 ns	1.00	2192 B	1.00
Imposter	10	571.0 ns	4.14 ns	3.87 ns	0.90	1792 B	0.82
TUnitMocks	10	1,429.9 ns	5.05 ns	4.72 ns	2.25	3840 B	1.75
Moq	10	139,002.0 ns	451.55 ns	422.38 ns	218.96	19085 B	8.71
NSubstitute	10	8,702.3 ns	55.84 ns	49.50 ns	13.71	12361 B	5.64
FakeItEasy	10	8,587.2 ns	39.76 ns	31.04 ns	13.53	15786 B	7.20

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

AMD EPYC 7763 3.13GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

CreateMock	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	18.18 ns	0.490 ns	0.459 ns	1.08	160 B	1.00
Mockolate	16.77 ns	0.176 ns	0.156 ns	1.00	160 B	1.00
Imposter	111.24 ns	0.884 ns	0.827 ns	6.63	576 B	3.60
TUnitMocks	34.27 ns	0.142 ns	0.126 ns	2.04	216 B	1.35
Moq	1,358.95 ns	3.579 ns	2.988 ns	81.04	2096 B	13.10
NSubstitute	1,889.71 ns	7.564 ns	7.076 ns	112.69	5048 B	31.55
FakeItEasy	1,749.93 ns	12.195 ns	11.407 ns	104.35	2763 B	17.27

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

Intel Xeon 6973P-C 4.09GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Event	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	363.4 ns	5.51 ns	4.60 ns	1.27	1.7 KB	1.00
Mockolate	285.6 ns	5.67 ns	4.74 ns	1.00	1744 B	1.00
Imposter	160.7 ns	1.90 ns	1.58 ns	0.56	512 B	0.29
TUnitMocks	173.6 ns	8.21 ns	7.68 ns	0.61	1392 B	0.80
Moq	10,607.7 ns	254.60 ns	212.60 ns	37.15	12808 B	7.34
NSubstitute	4,051.6 ns	186.66 ns	165.47 ns	14.19	9264 B	5.31
FakeItEasy	106,019.1 ns	3,127.20 ns	2,772.18 ns	371.29	15729 B	9.02

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

AMD EPYC 7763 3.08GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), 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	340.7 ns	6.24 ns	5.21 ns	0.66	2.41 KB	1.00
Mockolate	1	512.4 ns	18.16 ns	16.10 ns	1.00	2472 B	1.00
Imposter	1	212.5 ns	0.81 ns	0.71 ns	0.42	664 B	0.27
TUnitMocks	1	443.9 ns	2.28 ns	2.02 ns	0.87	1696 B	0.69
Moq	1	11,736.2 ns	70.19 ns	65.65 ns	22.92	10641 B	4.30
NSubstitute	1	7,552.4 ns	21.84 ns	20.43 ns	14.75	11720 B	4.74
FakeItEasy	1	8,293.2 ns	34.19 ns	30.30 ns	16.20	11508 B	4.66
baseline*	10	746.1 ns	11.70 ns	10.38 ns	0.74	2.91 KB	1.00
Mockolate	10	1,009.8 ns	6.91 ns	5.77 ns	1.00	2976 B	1.00
Imposter	10	382.2 ns	2.49 ns	2.33 ns	0.38	952 B	0.32
TUnitMocks	10	1,574.1 ns	18.51 ns	17.31 ns	1.56	4048 B	1.36
Moq	10	18,725.8 ns	107.78 ns	100.82 ns	18.55	18721 B	6.29
NSubstitute	10	17,364.9 ns	67.52 ns	59.85 ns	17.20	21585 B	7.25
FakeItEasy	10	19,746.6 ns	96.71 ns	90.46 ns	19.56	31546 B	10.60

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

AMD EPYC 7763 3.20GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Callback	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	307.9 ns	7.90 ns	7.39 ns	0.98	1.57 KB	1.00
Mockolate	315.7 ns	9.17 ns	8.57 ns	1.00	1608 B	1.00
Imposter	227.6 ns	2.78 ns	2.60 ns	0.72	744 B	0.46
TUnitMocks	510.9 ns	5.70 ns	4.76 ns	1.62	2064 B	1.28
Moq	98,519.7 ns	312.78 ns	277.27 ns	312.24	9096 B	5.66
NSubstitute	4,732.7 ns	46.35 ns	43.36 ns	15.00	7896 B	4.91
FakeItEasy	4,818.6 ns	60.77 ns	56.84 ns	15.27	6970 B	4.33

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 26.04.1 LTS (Resolute Raccoon)

AMD EPYC 9V74 3.69GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.14 (10.0.14, 10.0.1426.52326), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Indexer	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	997.3 ns	48.20 ns	45.08 ns	1.35	3.77 KB	1.00
Mockolate	1	741.1 ns	6.45 ns	6.03 ns	1.00	3.77 KB	1.00
Imposter	1	297.3 ns	4.49 ns	3.98 ns	0.40	1.19 KB	0.32
Moq	1	133,790.9 ns	880.06 ns	823.21 ns	180.54	20.39 KB	5.41
NSubstitute	1	7,422.3 ns	124.27 ns	116.24 ns	10.02	12.78 KB	3.39
FakeItEasy	1	7,722.0 ns	70.90 ns	62.85 ns	10.42	13.63 KB	3.62
baseline*	10	2,619.3 ns	16.18 ns	15.13 ns	1.32	4.82 KB	1.00
Mockolate	10	1,977.4 ns	51.88 ns	48.52 ns	1.00	4.82 KB	1.00
Imposter	10	748.2 ns	11.77 ns	11.01 ns	0.38	2.24 KB	0.47
Moq	10	141,384.3 ns	591.21 ns	553.02 ns	71.54	29.89 KB	6.20
NSubstitute	10	18,009.2 ns	106.20 ns	99.34 ns	9.11	25.58 KB	5.31
FakeItEasy	10	16,614.4 ns	250.97 ns	234.76 ns	8.41	32.97 KB	6.84

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

[github-actions]

👽 Mutation Results

Mockolate

Details

File	Score	Killed	Survived	Timeout	No Coverage	Ignored	Compile Errors	Runtime Errors	Total Detected	Total Undetected	Total Mutants

The final mutation score is NaN%

Coverage Thresholds: high:80 low:60 break:0