Fix test setup (#98)

* test: add unit test with vitest

* test: add e2e tests using `msw`

* ci: stricter permissions

* update lock file

* just assume node 24

* remove `next` branch references

* simplify

* use snapshots

* tweak

* revamp tests

* make tests concurrent

* refactor some tests

* refactor

* fixup branch name

* add extra test case

---------

Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>

Author: marcalexiei

.github/actions/ci-setup/action.yml

@@ -0,0 +1,15 @@
+name: Setup CI
+description: Setup Node and project dependencies using yarn
+
+runs:
+  using: composite
+  steps:
+    - name: Setup Node.js 24
+      uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
+      with:
+        node-version: 24
+        cache: yarn
+
+    - name: Install dependencies
+      shell: bash
+      run: yarn install --frozen-lockfile --ignore-scripts

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+  merge_group:
+    branches:
+      - master
+
+permissions: {}
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # 6.0.1
+        with:
+          persist-credentials: false
+
+      - name: Setup dependencies
+        uses: ./.github/actions/ci-setup
+
+      - name: Run test
+        run: yarn test
+
+  ci-ok:
+    name: CI OK
+    runs-on: ubuntu-latest
+    if: always()
+    needs: [test]
+    steps:
+      - name: Exit with error if some jobs are not successful
+        run: exit 1
+        if: ${{ always() && (contains(needs.*.result, 'failure') || contains(needs.*.result, 'skipped') || contains(needs.*.result, 'cancelled')) }}

index.test.js

@@ -97,7 +97,7 @@ ${changedPackages.map((x) => `"${x}": patch`).join("\n")}
 ${title}
 `);
 
-type PRContext = EmitterWebhookEvent<
+export type PRContext = EmitterWebhookEvent<
   "pull_request.opened" | "pull_request.synchronize"
 > &
   Omit<Context, keyof EmitterWebhookEvent>;

index.ts

@@ -5,18 +5,19 @@
   "private": true,
   "repository": "https://github.com/changesets/bot",
   "homepage": "https://github.com/apps/changeset-bot",
+  "scripts": {
+    "test": "vitest"
+  },
   "dependencies": {
     "@changesets/assemble-release-plan": "^6.0.2",
     "@changesets/config": "^3.0.1",
     "@changesets/parse": "^0.4.0",
     "@changesets/types": "^6.0.0",
     "@manypkg/get-packages": "^1.1.3",
-    "@types/bunyan": "^1.8.6",
-    "@types/express": "^4.17.2",
-    "@types/ioredis": "^4.14.8",
     "@types/js-yaml": "^3.12.2",
     "@types/markdown-table": "^2.0.0",
     "@types/micromatch": "^4.0.1",
+    "@types/node": "^25.5.0",
     "@types/node-fetch": "^2.5.5",
     "@types/react": "^18.0.14",
     "@types/react-dom": "^18.0.5",
@@ -32,11 +33,11 @@
     "typescript": "^4.7.4"
   },
   "devDependencies": {
-    "jest": "^24.1.0",
-    "nock": "^10.0.0",
-    "outdent": "^0.7.0"
+    "msw": "^2.12.14",
+    "vitest": "^4.1.1"
+  },
+  "resolutions": {
+    "vite": "npm:vite@8.0.0-beta.18"
   },
-  "jest": {
-    "testEnvironment": "node"
-  }
+  "packageManager": "yarn@1.22.22"
 }