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chore: Bump NSubstitute from 6.0.0 to 6.1.0 - #836

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chore: Bump NSubstitute from 6.0.0 to 6.1.0#836
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Updated NSubstitute from 6.0.0 to 6.1.0.

Release notes

Sourced from NSubstitute's releases.

6.1.0

NSubstitute v6.1.0

This release reverts nullability support introduced in 6.0. This change caused a number of problems for callers (#​973, #​976), and trying to resolve these (#​976) revealed the need for more fundamental changes to NSubstitute to effectively support this. As a result, nullability is again disabled for public API. Huge thanks to @​jdb0123, @​Romfos, and @​Moha-sami for their PRs addressing this, and thanks for all those who raised issues. We also humbly award @​zvirja with one unlimited "I told you so" pass to use as he sees fit.

What's Changed

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Full Changelog: nsubstitute/NSubstitute@v6.0.0...v6.1.0

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chore: Bump NSubstitute from 6.0.0 to 6.1.0
b98fe6a 
---
updated-dependencies:
- dependency-name: NSubstitute
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels Aug 10, 2026
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Test Results

    24 files  ±0      24 suites  ±0   14m 35s ⏱️ + 3m 11s
 4 320 tests ±0   4 318 ✅ ±0  2 💤 ±0  0 ❌ ±0 
27 568 runs  ±0  27 564 ✅ ±0  4 💤 ±0  0 ❌ ±0 

Results for commit b98fe6a. ± Comparison against base commit 969467e.

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🚀 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 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3


Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10
Event Mean Error StdDev Ratio Allocated Alloc Ratio
baseline* 225.5 ns 1.06 ns 0.99 ns 0.76 1.7 KB 1.00
Mockolate 296.7 ns 7.33 ns 6.86 ns 1.00 1.7 KB 1.00
Imposter 1,283.3 ns 7.44 ns 6.21 ns 4.33 8.8 KB 5.17
TUnitMocks 169.6 ns 0.50 ns 0.39 ns 0.57 1.34 KB 0.79
Moq 15,771.3 ns 104.99 ns 93.07 ns 53.17 12.51 KB 7.34
NSubstitute 5,475.8 ns 23.16 ns 19.34 ns 18.46 9.05 KB 5.31
FakeItEasy 215,801.0 ns 393.02 ns 367.63 ns 727.58 15.26 KB 8.96
Details 
BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

AMD EPYC 7763 2.64GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), 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 1.088 μs 0.0056 μs 0.0047 μs 1.22 3.77 KB 1.00
Mockolate 1 889.1 ns 8.41 ns 7.03 ns 1.00 3.77 KB 1.00
Imposter 1 854.8 ns 15.14 ns 14.16 ns 0.96 5.16 KB 1.37
Moq 1 217,993.8 ns 650.90 ns 577.01 ns 245.21 20.25 KB 5.38
NSubstitute 1 9,056.6 ns 71.05 ns 66.46 ns 10.19 12.84 KB 3.41
FakeItEasy 1 11,839.6 ns 100.23 ns 93.75 ns 13.32 13.63 KB 3.62
baseline* 10 2.875 μs 0.0206 μs 0.0192 μs 1.17 4.82 KB 1.00
Mockolate 10 2,451.5 ns 26.10 ns 24.41 ns 1.00 4.82 KB 1.00
Imposter 10 2,075.1 ns 40.66 ns 38.04 ns 0.85 7.97 KB 1.65
Moq 10 226,617.4 ns 940.78 ns 833.98 ns 92.45 28.64 KB 5.94
NSubstitute 10 22,191.6 ns 201.34 ns 188.34 ns 9.05 25.63 KB 5.32
FakeItEasy 10 25,530.2 ns 141.84 ns 132.68 ns 10.42 32.97 KB 6.84
Details 
BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

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

.NET SDK 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), 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* 1 587.3 ns 17.16 ns 16.05 ns 0.86 2.41 KB 1.00
Mockolate 1 682.7 ns 5.94 ns 5.56 ns 1.00 2.41 KB 1.00
Imposter 1 551.5 ns 7.24 ns 6.05 ns 0.81 3.13 KB 1.29
TUnitMocks 1 569.8 ns 2.00 ns 1.87 ns 0.83 1.64 KB 0.68
Moq 1 9,913.7 ns 38.63 ns 34.24 ns 14.52 10.39 KB 4.30
NSubstitute 1 6,376.8 ns 63.87 ns 59.74 ns 9.34 11.45 KB 4.74
FakeItEasy 1 6,514.3 ns 22.51 ns 21.06 ns 9.54 11.23 KB 4.65
baseline* 10 1,261.7 ns 8.63 ns 8.07 ns 0.89 2.91 KB 1.00
Mockolate 10 1,417.8 ns 5.13 ns 4.80 ns 1.00 2.91 KB 1.00
Imposter 10 1,441.1 ns 10.43 ns 9.75 ns 1.02 4.67 KB 1.61
TUnitMocks 10 2,108.3 ns 6.31 ns 5.90 ns 1.49 3.94 KB 1.35
Moq 10 16,587.0 ns 76.17 ns 71.25 ns 11.70 18.28 KB 6.29
NSubstitute 10 14,820.1 ns 37.90 ns 33.60 ns 10.45 21.08 KB 7.25
FakeItEasy 10 17,032.5 ns 67.06 ns 62.72 ns 12.01 30.81 KB 10.60
Details 
BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

AMD EPYC 7763 3.24GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v3


Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10
CreateMock Mean Error StdDev Ratio Allocated Alloc Ratio
baseline* 18.64 ns 0.341 ns 0.319 ns 1.01 160 B 1.00
Mockolate 18.46 ns 0.198 ns 0.185 ns 1.00 160 B 1.00
Imposter 277.88 ns 4.111 ns 3.845 ns 15.05 2248 B 14.05
TUnitMocks 36.35 ns 0.453 ns 0.379 ns 1.97 200 B 1.25
Moq 1,526.01 ns 4.881 ns 4.327 ns 82.66 2096 B 13.10
NSubstitute 2,065.94 ns 5.743 ns 5.372 ns 111.91 5048 B 31.55
FakeItEasy 1,938.06 ns 16.901 ns 15.810 ns 104.98 2763 B 17.27
Details 
BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)

INTEL XEON PLATINUM 8573C 3.38GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), X64 RyuJIT x86-64-v4


Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10
Callback Mean Error StdDev Ratio Allocated Alloc Ratio
baseline* 423.0 ns 2.20 ns 1.95 ns 1.45 1.57 KB 1.00
Mockolate 292.1 ns 4.97 ns 4.65 ns 1.00 1.57 KB 1.00
Imposter 340.4 ns 9.12 ns 8.53 ns 1.17 2.38 KB 1.52
TUnitMocks 455.3 ns 6.26 ns 5.85 ns 1.56 1.99 KB 1.27
Moq 39,660.9 ns 175.09 ns 155.21 ns 135.80 8.87 KB 5.65
NSubstitute 3,456.4 ns 69.89 ns 65.38 ns 11.83 7.71 KB 4.91
FakeItEasy 3,122.1 ns 75.84 ns 70.94 ns 10.69 6.8 KB 4.33
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 10.0.302

[Host] : .NET 10.0.10 (10.0.10, 10.0.1026.32716), 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* 1 270.3 ns 2.91 ns 2.58 ns 0.75 1.93 KB 1.00
Mockolate 1 360.0 ns 4.71 ns 3.93 ns 1.00 1.93 KB 1.00
Imposter 1 575.7 ns 7.25 ns 6.78 ns 1.60 4.04 KB 2.09
TUnitMocks 1 484.3 ns 6.55 ns 6.13 ns 1.35 2.02 KB 1.04
Moq 1 184,644.3 ns 513.26 ns 454.99 ns 512.99 14.58 KB 7.55
NSubstitute 1 5,846.2 ns 56.00 ns 52.38 ns 16.24 9.12 KB 4.72
FakeItEasy 1 5,956.0 ns 53.02 ns 49.60 ns 16.55 8.05 KB 4.17
baseline* 10 479.9 ns 5.88 ns 4.91 ns 0.74 2.14 KB 1.00
Mockolate 10 647.3 ns 2.36 ns 2.09 ns 1.00 2.14 KB 1.00
Imposter 10 1,098.2 ns 5.94 ns 5.56 ns 1.70 5.52 KB 2.58
TUnitMocks 10 1,359.9 ns 6.47 ns 6.05 ns 2.10 3.73 KB 1.74
Moq 10 189,791.3 ns 2,461.11 ns 2,302.12 ns 293.23 18.48 KB 8.63
NSubstitute 10 8,485.6 ns 101.19 ns 94.65 ns 13.11 12.07 KB 5.64
FakeItEasy 10 9,411.4 ns 175.04 ns 163.73 ns 14.54 15.42 KB 7.20

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

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