Set up CI to test the new watcher

* Run tests on macOS
* Use Bash shell
* Run watch mode test separately and serially

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version: [^16.18, ^18.16, ^20.3]
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
       - name: Enable symlinks
@@ -29,7 +29,8 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: npm
       - run: npm install --no-audit
-      - run: npm run cover
+      - run: ./scripts/ci.sh
+        shell: bash
       - uses: codecov/codecov-action@v3
         with:
           files: coverage/lcov.info
@@ -83,7 +84,8 @@ jobs:
         with:
           node-version-file: package.json
       - run: npm install --no-package-lock --no-audit
-      - run: npm run cover
+      - run: ./scripts/ci.sh
+        shell: bash
 
   xo:
     name: Lint source files

ava.config.js

@@ -1,5 +1,9 @@
+import process from 'node:process';
+
+const skipWatchMode = process.env.TEST_AVA_SKIP_WATCH_MODE ? ['!test/watch-mode/**'] : [];
+
 export default { // eslint-disable-line import/no-anonymous-default-export
-	files: ['test/**', '!test/**/{fixtures,helpers}/**'],
+	files: ['test/**', '!test/**/{fixtures,helpers}/**', ...skipWatchMode],
 	ignoredByWatcher: ['{coverage,docs,media,test-types,test-tap}/**'],
 	environmentVariables: {
 		AVA_FAKE_SCM_ROOT: '.fake-root', // This is an internal test flag.

package.json

@@ -36,8 +36,7 @@
 		"node": "^16.18 || ^18.16 || ^20.3"
 	},
 	"scripts": {
-		"cover": "c8 --report=none test-ava && c8 --report=none --no-clean tap && c8 report",
-		"test": "xo && tsc --noEmit && npm run -s cover"
+		"test": "./scripts/test.sh"
 	},
 	"files": [
 		"entrypoints",

scripts/ci.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -ex
+
+TEST_AVA_SKIP_WATCH_MODE=1 npx c8 --report=none npx test-ava
+# Reduce concurrency and be generous with timeouts to give watch mode tests a
+# better chance of succeeding in a CI environment.
+npx c8 --report=none --no-clean npx test-ava --serial --timeout 30s test/watch-mode
+npx c8 --report=none --no-clean npx tap
+npx c8 report

scripts/test.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -ex
+
+npx xo
+npx tsc --noEmit
+npx c8 --report=none npx test-ava
+npx c8 --report=none --no-clean npx tap
+npx c8 report