Add test and docs for CommonJS support (#30)

Author: davidjgoss

README.md

@@ -105,6 +105,8 @@ features/**/*.{cjs,js,mjs,cts,mts,ts}
 
 This isn't configurable ([yet](https://github.com/cucumber/cucumber-node/issues/10)).
 
+Both ESM (e.g. `import { Given } from '@cucumber/node'`) and CommonJS (e.g. `const { Given } = require('@cucumber/node')`) module formats are supported.
+
 ### TypeScript
 
 You can write your code in TypeScript. Depending on your project, you might either:

test/integration/modules.spec.ts

@@ -6,18 +6,40 @@ describe('Modules', () => {
   it('handles TypeScript code via type stripping', async () => {
     const harness = await makeTestHarness()
     await harness.writeFile(
-      'features/first.feature',
-      `Feature:
+        'features/first.feature',
+        `Feature:
   Scenario:
     Given a step
     `
     )
     await harness.writeFile(
-      'features/steps.ts',
-      `import { Given } from '@cucumber/node'
+        'features/steps.ts',
+        `import { Given } from '@cucumber/node'
 import type { TestCaseContext } from '@cucumber/node'
 Given('a step', (t: TestCaseContext) => {
   t.assert.strictEqual(2, 2)
+})
+    `
+    )
+    const [output] = await harness.run('spec', '--experimental-strip-types')
+    const sanitised = stripVTControlCharacters(output.trim())
+    expect(sanitised).to.include('ℹ pass 2')
+  })
+
+  it('handles CommonJS code via require(esm)', async () => {
+    const harness = await makeTestHarness()
+    await harness.writeFile(
+        'features/first.feature',
+        `Feature:
+  Scenario:
+    Given a step
+    `
+    )
+    await harness.writeFile(
+        'features/steps.cjs',
+        `const { Given } = require('@cucumber/node')
+Given('a step', (t) => {
+  t.assert.strictEqual(2, 2)
 })
     `
     )