Add option to skip unit test results in json/html report

[pkunze]

Describe the bug
We having trouble generating the HTML report. We are mutating a class which is covered by a lot of tests.
Now, the generated json file is approx 1.5 GB large and generating the HTML Report fails as can be seen below.

Working around by turning coverage analysis off works, but doesn't really help, since the mutation test will run very long in this case.

Logs

An error occurred during the mutation test run 
System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
   at System.String.CreateStringFromEncoding(Byte* bytes, Int32 byteLength, Encoding encoding)
   at System.Text.Encoding.GetString(ReadOnlySpan`1 bytes)
   at System.Text.Json.JsonReaderHelper.TranscodeHelper(ReadOnlySpan`1 utf8Unescaped)
   at System.Text.Json.JsonSerializer.WriteString[TValue](TValue& value, JsonTypeInfo`1 jsonTypeInfo)
   at System.Text.Json.JsonSerializer.Serialize[TValue](TValue value, JsonSerializerOptions options)
   at Stryker.Core.Reporters.Json.JsonReportSerialization.ToJson(IJsonReport report) in /_/src/Stryker.Core/Stryker.Core/Reporters/Json/JsonReportSerialization.cs:line 45
   at Stryker.Core.Reporters.Json.JsonReportSerialization.ToJsonHtmlSafe(IJsonReport report) in /_/src/Stryker.Core/Stryker.Core/Reporters/Json/JsonReportSerialization.cs:line 47
   at Stryker.Core.Reporters.Html.HtmlReporter.WriteHtmlReport(String filePath, IReadOnlyProjectComponent reportComponent, ITestProjectsInfo testProjectsInfo) in /_/src/Stryker.Core/Stryker.Core/Reporters/Html/HtmlReporter.cs:line 111
   at Stryker.Core.Reporters.Html.HtmlReporter.OnAllMutantsTested(IReadOnlyProjectComponent reportComponent, ITestProjectsInfo testProjectsInfo) in /_/src/Stryker.Core/Stryker.Core/Reporters/Html/HtmlReporter.cs:line 43
   at Stryker.Core.Reporters.BroadcastReporter.OnAllMutantsTested(IReadOnlyProjectComponent reportComponent, ITestProjectsInfo testProjectsInfo) in /_/src/Stryker.Core/Stryker.Core/Reporters/BroadcastReporter.cs:line 59
   at Stryker.Core.StrykerRunner.RunMutationTest(IStrykerInputs inputs, ILoggerFactory loggerFactory, IProjectOrchestrator projectOrchestrator) in /_/src/Stryker.Core/Stryker.Core/StrykerRunner.cs:line 105

Expected behavior
It would be great if there would be options to work around this without turning test coverage analysis off.
Maybe an option to disable the inclusion of covered tests in the HTML Report would do the job just fine?
Other than that, i have no idea how to solve this.

Desktop

• OS: Windows 11, Windows Server 2019
• Type of project: core
• Framework Version: .NET 8
• Stryker Version: 4.4.1

[rouke-broersma]

An option to turn off inclusion of test results in the json report seems fine to me. Perhaps there could also be a way for us to improve the handing of the json serialization so that we don't use so much memory. 1.5 gigs is insane for a report! Pretty sure that's the largest we've ever seen.