chore: Bump Imposter from 0.2.23 to 1.0.1 by dependabot[bot] · Pull Request #897 · Testably/Mockolate

dependabot · 2026-10-18T13:52:21Z

Updated Imposter from 0.2.23 to 1.0.1.

Release notes

1.0.1 Fixes

Release notes on nuget.org no longer show markdown escape backslashes (#395, closes #393). The notes went through a converter that escaped every character that could start markdown, so code such as Arg<int>.Is(5), _ => { } and $GITHUB_OUTPUT reached the package as Arg\<int>, \_ => and $GITHUB\_OUTPUT. A small script in the repository now drops only the markup the notes use, and the package smoke test checks the converted text on every pull request.

No change to the generator or the runtime API.

1.0.0

Imposter 1.0.0 is the first stable release. The package is the same single Imposter package as the 0.2.x line, with the generator and the Imposter.Abstractions runtime inside, and 0.2.27 upgrades to it without code changes.

What 1.0.0 commits to

The public API of Imposter.Abstractions: the GenerateImposter attribute, Arg and the span and out matchers, Count, ImposterMode, IHaveImposterInstance<T> with Instance(), and the two exceptions. See the Key API Reference.
The fluent setup, verification and event API that generated imposters expose, as documented for methods, properties, indexers and events.
The generator runs on Roslyn 4.0 through 5.0 and emits code for C# 8 through C# 14; every release is tested against all four compiler baselines.

TypeCaster, SpanElementsComparer<T> and SetupCollection<T> are public because generated imposters call them, but they are hidden from IntelliSense and may change with the generator in the same package.

Changes since 0.2.27

Generated-code helpers are hidden from IntelliSense (#392, closes #389). TypeCaster and SpanElementsComparer<T> carry EditorBrowsable(Never) like SetupCollection<T>; the Key API Reference gains an "Imposter Instance" section for IHaveImposterInstance<T> and Instance().
The generated _lastestInvocationImposter field is now spelled _latestInvocationImposter (#394, closes #390). The field is private to the generated class, so nothing changes for callers.

0.2.27 Maintenance

The publish workflow passes the release body straight to the markdown converter (#391, closes #388). The copy through $GITHUB_OUTPUT with a fixed EOF delimiter is gone, so a release body that contains a line of exactly EOF can no longer truncate the notes or fail the job. With #387, this is the first release whose notes reach the package through the file-based path, and it exercises that path end to end. No change to the generator or the runtime API.

0.2.26 Fixes

Setups that aren't configured yet no longer hide configured ones (#383, closes #381). A method setup took part in matching as soon as its arguments were given, before Returns, Throws or Callback configured it. Until then, a matching call returned the default value or threw MissingImposterException, even when an older setup had an outcome. That could happen in three ways:
- another thread called while a setup was being added;
- verifying with narrower arguments created a setup, as in imposter.Get(Arg<int>.Is(5)).Called(Count.Once()), which made later Get(5) calls lose an earlier Returns;
- a call went through a setup before its first outcome was configured, and that configuration was then lost.
A call now uses the newest matching setup that has an outcome. A setup without one is used only when nothing configured matches, so a bare void setup still allows its call in explicit mode. Behaviour change: a newer bare setup no longer overrides an older Throws or Callback for the same arguments. To make such a case do nothing, give its setup an empty callback: .Callback(_ => { }).

Maintenance

Debug builds of the generator no longer warn about an unused using (#385, closes #384). No behaviour change.

0.2.25 Performance

Calls no longer allocate to find their setup (#376, closes #371). Looking up the matching setup used to enumerate a concurrent stack, which allocated on every call. Setups now live in a SetupCollection<T> that's enumerated without allocating, and the newest matching setup still wins. Bytes per call:

Call Before After

method 144 B 96 B

void method 136 B 88 B

indexer getter 104 B 56 B

generic method (1 / 8 setups) 312 / 984 B 168 / 504 B

SetupCollection<T> is a new public type in Imposter.Abstractions, for generated code only. It's hidden from IntelliSense.
Less generator work on every edit (#377, closes #370). The generator now chooses each type parameter's generated name once per symbol. It writes types with no renamed type parameter directly. This drops the allocations of the incremental run after an edit by 20% for plain targets and by half for generic ones, and the generated code is unchanged.

Maintenance

The README and the docs show a benchmark table that a new workflow regenerates on a GitHub-hosted runner after every change to master (#380, closes #379). The docs page no longer labels Moq's results as Imposter's.
A generator benchmark (benchmarks/Imposter.GeneratorBenchmarks) measures cold and incremental runs (#377, #382, closes #374).

0.2.24 Fixes

Type parameters named await, file, required, scoped or extension (#378, closes #369). A target or method type parameter with one of these names made the imposter fail to compile:
- file and required from C# 11, read as modifiers;
- extension from C# 14, read as an extension block;
- scoped from C# 11;
- await in async methods.
A type parameter named like any contextual keyword your compiler knows now takes another name in generated code, as var, _, record and partial already did. That covers keywords later compilers add, such as the C# 15 preview's closed and union. You still write the imposter and its setups with your own type arguments, and dedicated namespaces keep the original names.
Method type parameters named like members of their generated types (#373, closes #349). A generic method whose type parameter was named Invoke, Returns, Matches, As, Callback, Then, Result or another member of the types generated for it failed with CS0102. Such a type parameter now takes another name in generated code; your setups don't change.

Maintenance

Regression tests for inherited generic methods whose type parameter is named like the target's (#368, closes #350); the fix itself shipped in 0.2.23 with #362. The generator also lost an unused helper (#375, closes #372). The generated imposters behave the same.

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--- updated-dependencies: - dependency-name: Imposter dependency-version: 1.0.1 dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>

dependabot · 2026-10-18T16:17:19Z

Superseded by #902.

github-actions · 2026-10-18T17:25:46Z

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

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

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), 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	402.0 ns	16.89 ns	14.97 ns	1.16	1.93 KB	1.00
Mockolate	1	347.3 ns	4.19 ns	3.50 ns	1.00	1.93 KB	1.00
Imposter	1	547.2 ns	6.77 ns	6.01 ns	1.58	3.99 KB	2.07
TUnitMocks	1	478.9 ns	4.27 ns	3.99 ns	1.38	2.02 KB	1.05
Moq	1	182,660.2 ns	519.90 ns	405.91 ns	526.06	14.58 KB	7.55
NSubstitute	1	6,417.0 ns	79.19 ns	74.07 ns	18.48	9.12 KB	4.72
FakeItEasy	1	6,081.0 ns	41.04 ns	36.38 ns	17.51	8.05 KB	4.17

baseline*	10	704.6 ns	17.06 ns	15.96 ns	1.09	2.14 KB	1.00
Mockolate	10	649.2 ns	8.57 ns	8.01 ns	1.00	2.14 KB	1.00
Imposter	10	914.1 ns	24.58 ns	20.53 ns	1.41	4.84 KB	2.26
TUnitMocks	10	1,364.2 ns	14.11 ns	13.20 ns	2.10	3.73 KB	1.74
Moq	10	188,282.1 ns	998.24 ns	933.75 ns	290.06	18.48 KB	8.63
NSubstitute	10	9,601.2 ns	52.95 ns	49.53 ns	14.79	12.07 KB	5.64
FakeItEasy	10	9,715.6 ns	154.40 ns	144.42 ns	14.97	15.42 KB	7.20

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

AMD EPYC 7763 3.17GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Event	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	290.3 ns	11.71 ns	10.96 ns	0.94	1.7 KB	1.00
Mockolate	307.7 ns	11.48 ns	10.74 ns	1.00	1.7 KB	1.00
Imposter	892.1 ns	30.63 ns	27.16 ns	2.90	7.18 KB	4.22
TUnitMocks	193.1 ns	6.49 ns	6.07 ns	0.63	1.34 KB	0.79
Moq	15,682.8 ns	68.66 ns	64.22 ns	51.03	12.51 KB	7.35
NSubstitute	6,019.9 ns	68.22 ns	63.81 ns	19.59	9.05 KB	5.31
FakeItEasy	216,036.8 ns	2,461.00 ns	2,181.61 ns	703.00	15.26 KB	8.96

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

AMD EPYC 9V74 2.60GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Callback	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	309.4 ns	7.72 ns	7.22 ns	1.25	1.57 KB	1.00
Mockolate	248.1 ns	6.40 ns	5.67 ns	1.00	1.57 KB	1.00
Imposter	332.0 ns	2.82 ns	2.50 ns	1.34	2.34 KB	1.49
TUnitMocks	409.0 ns	5.90 ns	4.93 ns	1.65	2 KB	1.27
Moq	57,827.9 ns	227.39 ns	201.58 ns	233.16	8.88 KB	5.66
NSubstitute	3,611.1 ns	42.90 ns	38.03 ns	14.56	7.71 KB	4.91
FakeItEasy	3,614.0 ns	67.51 ns	63.15 ns	14.57	6.81 KB	4.33

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

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

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), 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	999.5 ns	32.64 ns	27.25 ns	1.01	3.77 KB	1.00
Mockolate	1	991.5 ns	22.22 ns	17.35 ns	1.00	3.77 KB	1.00
Imposter	1	809.6 ns	8.89 ns	7.42 ns	0.82	4.95 KB	1.32
Moq	1	219,908.5 ns	857.94 ns	760.55 ns	221.86	20.37 KB	5.41
NSubstitute	1	10,681.6 ns	30.15 ns	28.20 ns	10.78	12.78 KB	3.39
FakeItEasy	1	12,586.2 ns	77.63 ns	72.62 ns	12.70	13.63 KB	3.62

baseline*	10	2,472.3 ns	27.65 ns	25.86 ns	0.94	4.82 KB	1.00
Mockolate	10	2,625.8 ns	23.59 ns	22.07 ns	1.00	4.82 KB	1.00
Imposter	10	1,484.0 ns	71.32 ns	66.71 ns	0.57	6.01 KB	1.25
Moq	10	232,197.1 ns	1,246.71 ns	1,166.17 ns	88.44	29.89 KB	6.20
NSubstitute	10	25,176.7 ns	211.19 ns	197.54 ns	9.59	25.58 KB	5.31
FakeItEasy	10	25,409.5 ns	169.50 ns	141.54 ns	9.68	32.97 KB	6.84

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

AMD EPYC 9V45 2.60GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

CreateMock	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	20.55 ns	1.009 ns	0.944 ns	1.93	160 B	1.00
Mockolate	10.64 ns	0.498 ns	0.466 ns	1.00	160 B	1.00
Imposter	156.93 ns	4.248 ns	3.974 ns	14.78	2240 B	14.00
TUnitMocks	21.43 ns	0.520 ns	0.461 ns	2.02	200 B	1.25
Moq	821.26 ns	15.338 ns	13.597 ns	77.33	2096 B	13.10
NSubstitute	1,087.45 ns	32.899 ns	30.773 ns	102.40	5048 B	31.55
FakeItEasy	1,088.04 ns	26.972 ns	25.229 ns	102.45	2763 B	17.27

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.5 LTS (Noble Numbat)

INTEL XEON PLATINUM 8573C 2.30GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.303

[Host] : .NET 10.0.13 (10.0.13, 10.0.1326.50504), X64 RyuJIT x86-64-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Property	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	492.0 ns	13.95 ns	13.05 ns	0.91	2.41 KB	1.00
Mockolate	1	541.3 ns	31.47 ns	29.44 ns	1.00	2.41 KB	1.00
Imposter	1	320.9 ns	7.10 ns	6.64 ns	0.59	2.98 KB	1.23
TUnitMocks	1	459.3 ns	10.90 ns	10.20 ns	0.85	1.64 KB	0.68
Moq	1	8,884.5 ns	76.34 ns	67.67 ns	16.46	10.39 KB	4.30
NSubstitute	1	5,826.0 ns	170.08 ns	159.09 ns	10.79	11.45 KB	4.74
FakeItEasy	1	5,230.7 ns	114.85 ns	101.81 ns	9.69	11.23 KB	4.65

baseline*	10	988.6 ns	12.13 ns	11.34 ns	0.85	2.91 KB	1.00
Mockolate	10	1,156.4 ns	30.46 ns	27.00 ns	1.00	2.91 KB	1.00
Imposter	10	557.6 ns	19.23 ns	17.99 ns	0.48	3.26 KB	1.12
TUnitMocks	10	1,773.1 ns	43.52 ns	40.71 ns	1.53	3.94 KB	1.35
Moq	10	13,987.4 ns	382.76 ns	358.03 ns	12.10	18.28 KB	6.29
NSubstitute	10	13,643.9 ns	266.93 ns	249.69 ns	11.80	21.08 KB	7.25
FakeItEasy	10	14,452.0 ns	223.79 ns	209.33 ns	12.50	30.8 KB	10.60

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

github-actions · 2026-10-18T17:33:03Z

👽 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

chore: Bump Imposter from 0.2.23 to 1.0.1

f9900f6

--- updated-dependencies: - dependency-name: Imposter dependency-version: 1.0.1 dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>

dependabot Bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels Oct 18, 2026

dependabot Bot closed this Oct 18, 2026

dependabot Bot deleted the dependabot/nuget/Imposter-1.0.1 branch October 18, 2026 16:17

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chore: Bump Imposter from 0.2.23 to 1.0.1 - #897

chore: Bump Imposter from 0.2.23 to 1.0.1#897
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Call	Before	After
method	144 B	96 B
void method	136 B	88 B
indexer getter	104 B	56 B
generic method (1 / 8 setups)	312 / 984 B	168 / 504 B

Conversation

dependabot Bot commented on behalf of github Oct 18, 2026

1.0.1

Fixes

1.0.0

What 1.0.0 commits to

Changes since 0.2.27

0.2.27

Maintenance

0.2.26

Fixes

Maintenance

0.2.25

Performance

Maintenance

0.2.24

Fixes

Maintenance

Uh oh!

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🚀 Benchmark Results

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github-actions Bot commented Oct 18, 2026

👽 Mutation Results

Mockolate

The final mutation score is NaN%

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

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