@temporalio/nyc-test-coverage

Temporal's TypeScript SDK integration for Workflow code coverage with nyc and similar tools.

Getting Started

1. npm install -D mocha nyc @temporalio/nyc-test-coverage
2. Instantiate WorkflowCoverage from this package, and call augmentWorkerOptions() to configure Workflows to gather and export code coverage data:

import { WorkflowCoverage } from '@temporalio/nyc-test-coverage';

const workflowCoverage = new WorkflowCoverage();

worker = await Worker.create(workflowCoverage.augmentWorkerOptions({
  connection: nativeConnection,
  taskQueue,
  workflowsPath: require.resolve("./workflows"),
}));

3. After your tests are done, call mergeIntoGlobalCoverage() to merge your Workflows' code coverage into nyc's global coverage.

after(() => {
  workflowCoverage.mergeIntoGlobalCoverage();
});

Usage with bundleWorkflowCode()

If you are pre-bundling your Workflows using bundleWorkflowCode(), we recommend using the augmentBundleOptions() method to configure your bundle options, followed by augmentWorkerOptionsWithBundle() to configure your Worker options as follows.

const bundle = await bundleWorkflowCode(
  workflowCoverage.augmentBundleOptions({
    workflowsPath: require.resolve('./workflows'),
  })
);

const worker = await Worker.create(
  workflowCoverage.augmentWorkerOptionsWithBundle({
    connection,
    taskQueue,
    workflowBundle: bundle,
    activities,
  })
);

With bundleWorkflowCode(), you still need to call mergeIntoGlobalCoverage() when your tests are done to merge Workflow test coverage into nyc's global test coverage.

after(() => {
  workflowCoverage.mergeIntoGlobalCoverage();
});

Usage with Jest

This package also works with Jest code coverage. However, this package only works with the default coverageProvider option 'babel'. This package does not work with coverageProvider: 'v8'. Complete the following steps to use this package with Jest.

1. npm install jest @temporalio/nyc-test-coverage
2. Check your Jest config and make sure the coverageProvider option is not set to 'v8'. Set coverageProvider to 'babel'.
3. Instantiate WorkflowCoverage from this package, and call augmentWorkerOptions() to configure Workflows to gather and export code coverage data:

import { WorkflowCoverage } from '@temporalio/nyc-test-coverage';

const workflowCoverage = new WorkflowCoverage();

worker = await Worker.create(workflowCoverage.augmentWorkerOptions({
  connection: nativeConnection,
  taskQueue,
  workflowsPath: require.resolve("./workflows"),
}));

4. After your tests are done, call mergeIntoGlobalCoverage() to merge your Workflows' code coverage into Jest's global coverage.

afterAll(() => {
  workflowCoverage.mergeIntoGlobalCoverage();
});