Add support for mocha-json

src/parsers/mocha-json/mocha-json-parser.ts

@@ -0,0 +1,118 @@
+import {ParseOptions, TestParser} from '../../test-parser'
+import {
+  TestCaseError,
+  TestCaseResult,
+  TestExecutionResult,
+  TestGroupResult,
+  TestRunResult,
+  TestSuiteResult
+} from '../../test-results'
+import {getExceptionSource} from '../../utils/node-utils'
+import {getBasePath, normalizeFilePath} from '../../utils/path-utils'
+import {MochaJson, MochaJsonTest} from './mocha-json-types'
+
+export class MochaJsonParser implements TestParser {
+  assumedWorkDir: string | undefined
+
+  constructor(readonly options: ParseOptions) {}
+
+  async parse(path: string, content: string): Promise<TestRunResult> {
+    const mocha = this.getMochaJson(path, content)
+    const result = this.getTestRunResult(path, mocha)
+    result.sort(true)
+    return Promise.resolve(result)
+  }
+
+  private getMochaJson(path: string, content: string): MochaJson {
+    try {
+      return JSON.parse(content)
+    } catch (e) {
+      throw new Error(`Invalid JSON at ${path}\n\n${e}`)
+    }
+  }
+
+  private getTestRunResult(resultsPath: string, mocha: MochaJson): TestRunResult {
+    const suitesMap: {[path: string]: TestSuiteResult} = {}
+
+    const getSuite = (test: MochaJsonTest): TestSuiteResult => {
+      const path = this.getRelativePath(test.file)
+      return suitesMap[path] ?? (suitesMap[path] = new TestSuiteResult(path, []))
+    }
+
+    for (const test of mocha.passes) {
+      const suite = getSuite(test)
+      this.processTest(suite, test, 'success')
+    }
+
+    for (const test of mocha.failures) {
+      const suite = getSuite(test)
+      this.processTest(suite, test, 'failed')
+    }
+
+    for (const test of mocha.pending) {
+      const suite = getSuite(test)
+      this.processTest(suite, test, 'skipped')
+    }
+
+    const suites = Object.values(suitesMap)
+    return new TestRunResult(resultsPath, suites, mocha.stats.duration)
+  }
+
+  private processTest(suite: TestSuiteResult, test: MochaJsonTest, result: TestExecutionResult): void {
+    const groupName =
+      test.fullTitle !== test.title
+        ? test.fullTitle.substr(0, test.fullTitle.length - test.title.length).trimEnd()
+        : null
+
+    let group = suite.groups.find(grp => grp.name === groupName)
+    if (group === undefined) {
+      group = new TestGroupResult(groupName, [])
+      suite.groups.push(group)
+    }
+
+    const error = this.getTestCaseError(test)
+    const testCase = new TestCaseResult(test.title, result, test.duration, error)
+    group.tests.push(testCase)
+  }
+
+  private getTestCaseError(test: MochaJsonTest): TestCaseError | undefined {
+    const details = test.err.stack
+    const message = test.err.message
+    if (details === undefined) {
+      return undefined
+    }
+
+    let path
+    let line
+
+    const src = getExceptionSource(details, this.options.trackedFiles, file => this.getRelativePath(file))
+    if (src) {
+      path = src.path
+      line = src.line
+    }
+
+    return {
+      path,
+      line,
+      message,
+      details
+    }
+  }
+
+  private getRelativePath(path: string): string {
+    path = normalizeFilePath(path)
+    const workDir = this.getWorkDir(path)
+    if (workDir !== undefined && path.startsWith(workDir)) {
+      path = path.substr(workDir.length)
+    }
+    return path
+  }
+
+  private getWorkDir(path: string): string | undefined {
+    return (
+      this.options.workDir ??
+      this.assumedWorkDir ??
+      (this.assumedWorkDir = getBasePath(path, this.options.trackedFiles))
+    )
+  }
+}

src/parsers/mocha-json/mocha-json-types.ts

@@ -0,0 +1,23 @@
+export interface MochaJson {
+  stats: MochaJsonStats
+  passes: MochaJsonTest[]
+  pending: MochaJsonTest[]
+  failures: MochaJsonTest[]
+}
+
+export interface MochaJsonStats {
+  duration: number
+}
+
+export interface MochaJsonTest {
+  title: string
+  fullTitle: string
+  file: string
+  duration: number
+  err: MochaJsonTestError
+}
+
+export interface MochaJsonTestError {
+  stack?: string
+  message?: string
+}