fix: require Roslyn 5.0 instead of 5.6 for the generator and analyzers

[vbreuss]

The generator and analyzers referenced Microsoft.CodeAnalysis 5.6.0, which ships with the .NET 10.0.30x SDK. Roslyn refuses to load a component that references a newer compiler than the host (CS9057), so every older host silently skipped them: no generated members, and 'Cannot resolve symbol CreateMock' throughout the IDE while the command-line build stayed green.

Pin the three shipped components to the oldest Roslyn they actually need. 5.0 is the floor, not lower: the emitted Mock.g.cs declares CreateMock in a C# 14 extension block, so a C# 13 host parses it as garbage and generates no mocks at all. That also rules out any pre-C# 14 host, since a static extension member has no older equivalent.

Mockolate.SourceGenerators.Tests pins the same version, so reaching for a newer Roslyn API fails the build and the generator tests here rather than silently breaking consumers' IDEs.

MinimumRoslynVersion sits in the root Directory.Build.props because the test tree imports that one but not Source/Directory.Build.props.

[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]

Test Results

    24 files  ±0      24 suites  ±0   10m 55s ⏱️ +4s
 4 263 tests ±0   4 261 ✅ ±0  2 💤 ±0  0 ❌ ±0 
27 209 runs  ±0  27 205 ✅ ±0  4 💤 ±0  0 ❌ ±0 

Results for commit 6879f4d. ± Comparison against base commit 01a814a.

[github-actions]

🚀 Benchmark Results

Details

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

AMD EPYC 9V74 3.69GHz, 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

Event	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	311.1 ns	9.62 ns	9.00 ns	1.37	1.7 KB	1.00
Mockolate	226.7 ns	0.94 ns	0.83 ns	1.00	1.7 KB	1.00
Imposter	981.0 ns	4.19 ns	3.92 ns	4.33	8.8 KB	5.17
TUnitMocks	135.1 ns	0.79 ns	0.74 ns	0.60	1.34 KB	0.79
Moq	10,659.6 ns	72.27 ns	67.60 ns	47.03	12.51 KB	7.34
NSubstitute	3,847.3 ns	12.71 ns	11.88 ns	16.97	9.05 KB	5.31
FakeItEasy	185,281.5 ns	693.21 ns	648.43 ns	817.47	15.26 KB	8.96

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 10.0.302

[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	1,089.7 ns	33.52 ns	29.71 ns	1.12	3.77 KB	1.00
Mockolate	1	971.0 ns	35.87 ns	33.56 ns	1.00	3.77 KB	1.00
Imposter	1	879.4 ns	20.87 ns	19.53 ns	0.91	5.16 KB	1.37
Moq	1	165,997.0 ns	1,257.28 ns	1,114.54 ns	171.15	20.45 KB	5.43
NSubstitute	1	8,550.6 ns	87.47 ns	81.82 ns	8.82	12.84 KB	3.41
FakeItEasy	1	10,093.8 ns	93.84 ns	87.78 ns	10.41	13.63 KB	3.62
baseline*	10	2,612.9 ns	8.36 ns	7.82 ns	1.09	4.82 KB	1.00
Mockolate	10	2,390.7 ns	13.40 ns	10.46 ns	1.00	4.82 KB	1.00
Imposter	10	1,982.1 ns	17.27 ns	14.42 ns	0.83	7.97 KB	1.65
Moq	10	176,729.3 ns	1,299.28 ns	1,151.78 ns	73.92	29.97 KB	6.22
NSubstitute	10	20,844.5 ns	27.25 ns	21.27 ns	8.72	25.63 KB	5.32
FakeItEasy	10	20,684.6 ns	134.02 ns	111.91 ns	8.65	32.97 KB	6.84

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 10.0.302

[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

Property	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	538.6 ns	7.87 ns	6.98 ns	1.02	2.41 KB	1.00
Mockolate	1	529.3 ns	9.67 ns	8.57 ns	1.00	2.41 KB	1.00
Imposter	1	448.8 ns	5.12 ns	4.28 ns	0.85	3.13 KB	1.29
TUnitMocks	1	477.8 ns	4.01 ns	3.75 ns	0.90	1.64 KB	0.68
Moq	1	10,825.6 ns	171.33 ns	160.27 ns	20.46	10.39 KB	4.30
NSubstitute	1	6,907.3 ns	92.66 ns	86.68 ns	13.05	11.45 KB	4.74
FakeItEasy	1	7,860.9 ns	93.38 ns	87.34 ns	14.86	11.24 KB	4.66
baseline*	10	1,045.8 ns	21.98 ns	20.56 ns	1.00	2.91 KB	1.00
Mockolate	10	1,046.1 ns	20.09 ns	17.81 ns	1.00	2.91 KB	1.00
Imposter	10	1,127.8 ns	10.22 ns	8.54 ns	1.08	4.67 KB	1.61
TUnitMocks	10	1,664.2 ns	11.50 ns	10.19 ns	1.59	3.94 KB	1.35
Moq	10	17,137.6 ns	106.77 ns	94.65 ns	16.39	18.28 KB	6.29
NSubstitute	10	16,400.4 ns	47.91 ns	42.47 ns	15.68	21.08 KB	7.25
FakeItEasy	10	18,121.1 ns	232.12 ns	193.83 ns	17.33	30.81 KB	10.60

Details

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

AMD EPYC 7763 2.77GHz, 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*	19.25 ns	0.262 ns	0.245 ns	1.06	160 B	1.00
Mockolate	18.20 ns	0.440 ns	0.412 ns	1.00	160 B	1.00
Imposter	277.27 ns	6.628 ns	6.200 ns	15.24	2248 B	14.05
TUnitMocks	35.97 ns	0.429 ns	0.401 ns	1.98	200 B	1.25
Moq	1,449.44 ns	13.496 ns	11.963 ns	79.68	2096 B	13.10
NSubstitute	2,047.20 ns	37.918 ns	35.469 ns	112.54	5048 B	31.55
FakeItEasy	1,849.75 ns	19.081 ns	15.934 ns	101.68	2763 B	17.27

Details

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

AMD EPYC 7763 2.66GHz, 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

Callback	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	315.9 ns	7.47 ns	6.99 ns	0.96	1.57 KB	1.00
Mockolate	330.0 ns	8.56 ns	7.59 ns	1.00	1.57 KB	1.00
Imposter	416.8 ns	11.87 ns	10.52 ns	1.26	2.38 KB	1.52
TUnitMocks	491.3 ns	6.74 ns	6.31 ns	1.49	1.99 KB	1.27
Moq	98,221.9 ns	210.73 ns	186.80 ns	297.77	8.88 KB	5.66
NSubstitute	4,597.2 ns	36.30 ns	33.96 ns	13.94	7.71 KB	4.91
FakeItEasy	4,939.8 ns	37.37 ns	29.18 ns	14.98	6.81 KB	4.33

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 10.0.302

[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

Method	N	Mean	Error	StdDev	Ratio	Allocated	Alloc Ratio
baseline*	1	431.7 ns	8.18 ns	7.65 ns	1.60	1.93 KB	1.00
Mockolate	1	269.4 ns	2.28 ns	2.02 ns	1.00	1.93 KB	1.00
Imposter	1	404.9 ns	2.21 ns	1.96 ns	1.50	4.04 KB	2.09
TUnitMocks	1	372.1 ns	1.48 ns	1.31 ns	1.38	2.02 KB	1.04
Moq	1	103,033.6 ns	452.07 ns	422.86 ns	382.50	14.59 KB	7.56
NSubstitute	1	4,095.8 ns	13.80 ns	12.24 ns	15.21	9.12 KB	4.72
FakeItEasy	1	4,434.2 ns	13.00 ns	12.16 ns	16.46	8.27 KB	4.29
baseline*	10	735.9 ns	10.41 ns	9.74 ns	1.56	2.14 KB	1.00
Mockolate	10	470.7 ns	1.13 ns	1.05 ns	1.00	2.14 KB	1.00
Imposter	10	813.5 ns	3.25 ns	2.88 ns	1.73	5.52 KB	2.58
TUnitMocks	10	1,081.3 ns	4.50 ns	4.21 ns	2.30	3.73 KB	1.74
Moq	10	106,650.7 ns	484.32 ns	453.04 ns	226.59	18.49 KB	8.64
NSubstitute	10	6,350.1 ns	24.66 ns	19.26 ns	13.49	12.07 KB	5.64
FakeItEasy	10	7,035.5 ns	59.48 ns	55.64 ns	14.95	15.65 KB	7.31

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 v3.4.0.