mochaOptions is not recognised as a Stryker option when mocha-runner is installed

[SmashingQuasar]

Summary

Hey!

I am trying to run Stryker on a project that uses Mocha.
I followed the documentation and added the necessary plugin and fragments within the stryker.conf.json.

Since I am working on an Open Source project, you can directly try it out on the repository.

Please note this is using a pnpm workspace.

Other notes:

Originally, I was having a better time with Stryker (if you reset the previous commit by running git reset HEAD^, git restore . and git clean -df you'll see the state of the repository in a more working state for stryker). The problem was that Stryker was messing up the coverage by adding some code before the tested coded which led to a broken coverage report.

Stryker config

{
	"packageManager": "pnpm",
	"mutate": [
		"./src/**/*.mts"
	],
	"ignorePatterns": [
		"**/node_modules/**",
		"**/.github/**",
		"**/.husky/**",
		"**/.stryker-tmp/**",
		"**/stats/**",
		"**/docs/**",
		"**/documentations/**",
		"**/reports/**",
		"**/coverage/**",
		"**/build/**",
		"**/dist/**",
		"**/lib/**"
	],
	"concurrency": 6,
	"reporters": [
		"html",
		"clear-text",
		"progress"
	],
	"htmlReporter": {
		"fileName": "./reports/stryker/mutation.html"
	},
	"jsonReporter": {
		"fileName": "./reports/stryker/mutation.json"
	},
	"buildCommand": "tsc -b tsconfig.stryker.json",
	"coverageAnalysis": "perTest",
  "mochaOptions": {
    "config": ".mocharc.json",
    "spec": [ "./build/**/*.spec.jts"]
  },
	"ignoreStatic": true,
	"tsconfigFile": "tsconfig.stryker.json",
  "testRunner": "mocha"
}

Test runner config

.mocharc.json

{
	"extension": [
		"mts"
	],
	"node-option": [
		"experimental-specifier-resolution=node",
		"loader=ts-node/esm"
	],
	"spec": [
		"test/**/*.spec.mts"
	],
	"timeout": 5000,
	"parallel": true,
	"checkLeaks": true,
	"diff": true,
	"forbidPending": true
}

Stryker environment

@stryker-mutator/core 8.2.6
@stryker-mutator/mocha-runner 8.2.6
@stryker-mutator/typescript-checker 8.2.6

@types/mocha 10.0.6
mocha 10.3.0
@types/chai 4.3.12
chai 5.1.0
@types/sinon 17.0.3
sinon 17.0.1

Test runner environment

TS_NODE_PROJECT=./tsconfig.mocha.json c8 mocha --parallel

Root level tsconfig.json:

{
	"$schema": "https://json.schemastore.org/tsconfig",
	"compileOnSave": false,
	"compilerOptions": {
		"module": "NodeNext",
		"moduleResolution": "NodeNext",
		"skipLibCheck": true,
		"skipDefaultLibCheck": true,
		"pretty": true,
		"declaration": false,
		"importHelpers": true,
		"newLine": "LF",
		"preserveConstEnums": true,
		"sourceMap": false,
		"allowJs": false,
		"checkJs": false,
		"noStrictGenericChecks": false,
		"allowSyntheticDefaultImports": false,
		"forceConsistentCasingInFileNames": true,
		"experimentalDecorators": true,
		"emitDecoratorMetadata": true,
		"noErrorTruncation": true,
		"target": "ESNext",
		"lib": [
			"ESNext"
		],
		"allowUnreachableCode": false,
		"allowUnusedLabels": false,
		"alwaysStrict": true,
		"exactOptionalPropertyTypes": true,
		"noFallthroughCasesInSwitch": true,
		"noImplicitAny": true,
		"noImplicitOverride": true,
		"noImplicitReturns": true,
		"noImplicitThis": true,
		"noPropertyAccessFromIndexSignature": true,
		"noUncheckedIndexedAccess": true,
		"noUnusedLocals": true,
		"noUnusedParameters": true,
		"strict": true,
		"strictBindCallApply": true,
		"strictFunctionTypes": true,
		"strictNullChecks": true,
		"strictPropertyInitialization": true,
		"useUnknownInCatchVariables": true
	},
	"exclude": [
		"node_modules"
	]
}

Package-level tsconfig.json:

{
	"$schema": "https://json.schemastore.org/tsconfig",
	"extends": "../../tsconfig.json",
	"compilerOptions": {
		"allowSyntheticDefaultImports": true
	},
	"include": [
		"./src",
		"./test",
		"./mocks"
	],
	"exclude": [
		"./node_modules"
	]
}

Package-level tsconfig.build.json:

{
	"extends": "./tsconfig.json",
	"compilerOptions": {
		"outDir": "./build/esm",
		"declarationDir": "./build/types",
		"rootDir": "./src",
		"declaration": true,
		"declarationMap": false,
		"removeComments": false,
		"sourceMap": false,
		"noEmit": false,
		"listFiles": false,
		"listEmittedFiles": false
	},
	"include": [
		"./src"
	]
}

Package-level tsconfig.mocha.json:

{
	"extends": "./tsconfig.json",
	"include": [".", "./**/.*", "./**/*.json"],
	"ts-node": {
	  "files": true,
	  "swc": true
	}
  }

Package-level tsconfig.stryker.json:

{
	"extends": "./tsconfig.json",
	"compilerOptions": {
		"sourceMap": true
	},
	"include": [
		"./src/**/*",
		"./test/**/*",
		"./mocks/**/*"
	],
	"ts-node": {
	  "files": true,
	  "swc": true
	}
}

Your Environment

software	version(s)
node	v20.11.1
npm	-
pnpm	8.15.4
Operating System	Debian GNU/Linux 12 (bookworm)

Add stryker.log

stryker.log

[SmashingQuasar]

Hey!

As a follow up, we merged the associated branch so any test should be done from main.