Create instructions file for Copilot

.github/instructions/test-reporter.instructions.md

@@ -0,0 +1,15 @@
+---
+applyTo: '**'
+---
+
+Instructions:
+
+  - Ensure Node.js 20 is installed and used for all development and CI tasks.
+  - Do not update the Node.js runtime to versions newer than 20.
+  - Install all dependencies using `npm install`.
+  - Use TypeScript for all source code; ensure `tsconfig.json` is present and configured.
+  - Use `npm test` to run tests; ensure all tests pass before committing changes.
+  - Validate changes by running `npm run all` before submitting pull requests or merging.
+  - This project is a GitHub Actions action; ensure compatibility with GitHub Actions workflows.
+  - After validating changes, create a new commit with the `dist/` directory included.
+  - Document any changes to the action's inputs, outputs, or behavior in the README.

__tests__/utils/parse-utils.test.ts

@@ -32,6 +32,6 @@ describe('parseNetDuration', () => {
   })
 
   it('throws when string has invalid format', () => {
-    expect(() => parseNetDuration('12:34:56 not a duration')).toThrow(/^Invalid format/)
+    expect(() => parseNetDuration('12:34:56 not a duration')).toThrowError(/^Invalid format/)
   })
 })

package.json

@@ -61,7 +61,8 @@
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-jest": "^28.14.0",
     "eslint-plugin-prettier": "^5.5.1",
-    "jest": "^30.0.4",
+    "jest": "^29.7.0",
+    "jest-circus": "^29.7.0",
     "jest-junit": "^16.0.0",
     "js-yaml": "^4.1.0",
     "prettier": "^3.6.2",