Mutation testing metrics

Utility function to calculate mutation testing metrics..

See mutant states and metrics on the Stryker website for more details about mutation testing metrics.

Usage example

See the below example (uses TypeScript):

import { MetricsResult, calculateMutationTestMetrics } from 'mutation-testing-metrics';
import { MutationTestResult } from 'mutation-testing-report-schema';

const mutationTestReport: MutationTestResult = {
  /*... Get a holds of mutation test results somehow */
};

const result: MetricsResult = calculateMutationTestMetrics(mutationTestReport);

console.log('Mutation score', result.metrics.mutationScore);

API Reference

calculateMutationTestMetrics [(MutationTestResult) => MutationTestMetricsResult]

Calculates the full mutation test metrics from both the files-under-test as well as (optionally) the test files.

The input is a mutation test result valid according to the [https://github.com/stryker-mutator/mutation-testing-elements/tree/master/packages/report-schema#readme]

Returns A MutationTestMetricsResult that contains both the systemUnderTestMetrics as well as the testMetrics

calculateMetrics [(MutationTestResult) => MetricsResult]

Calculates the files-under-test metrics inside of a mutation testing report.

The input is a mutation test result valid according to the [https://github.com/stryker-mutator/mutation-testing-elements/tree/master/packages/report-schema#readme]

aggregateResultsByModule [(Record<string, MutationTestResult>) => MutationTestResult]

Aggregates multiple reports together into a single report, grouped by module.

Input: resultsByModule The MutationTestResult objects by module name.

Types

Types are included and documented with TypeScript.