Add CI workflow

.github/workflows/cd.yml

@@ -0,0 +1,44 @@
+# .github/workflows/cd.yml
+name: Deploying to Github Pages
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch repository
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn'
+      - name: Install dependencies
+        run: |
+          yarn
+      - name: Building
+        run: |
+          NODE_ENV=production yarn build
+      - name: Uploading production artifacts
+        uses: actions/upload-pages-artifact@v3
+        with:
+          name: github-pages
+          path: dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Publishing production artifact
+        id: deployment
+        uses: actions/deploy-pages@v4
+        with:
+          artifact_name: github-pages

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+# .github/workflows/ci.yml
+name: CI/CD Pipeline 
+# this workflow will run when there is a pull req (when will it run?)
+on: [pull_request, workflow_dispatch]
+# jobs are vms that run your behaviour
+jobs:
+  unit-tests: # id -> let us refer to job itself
+    runs-on: ubuntu-latest
+    steps:
+    # fetch repo that person made the pull req
+      - name: Fetch repository
+        uses: actions/checkout@v4
+        # Install nodejs 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn' # stick to yarn log file
+        # Install proj dependencies
+      - name: Install dependencies
+      # Run set of commands within vm 
+        run: |
+          yarn
+        # Run 
+      - name: Run unit tests
+        run: |
+          NODE_ENV=production yarn test

.github/workflows/ci2.yml

@@ -0,0 +1,37 @@
+# .github/workflows/ci.yml
+name: CI/CD Pipeline
+on: [pull_request, workflow_dispatch]
+jobs:
+  linting:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch repository
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn'
+      - name: Install dependencies
+        run: |
+          yarn
+      - name: Lint code
+        run: |
+          yarn lint
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch repository
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'yarn'
+      - name: Install dependencies
+        run: |
+          yarn
+      - name: Run unit tests
+        run: |
+          NODE_ENV=production yarn test

src/calculator.test.ts

@@ -10,7 +10,7 @@ test('subtract 1 + 2 to equal -1', () => {
 });
 
 test('divide 1 / 2 to equal 0.5', () => {
-  expect(divide(1, 2)).toBe(0.4);
+  expect(divide(1, 2)).toBe(0.5);
 });
 
 test('multiply 1 * 2 to equal 2', () => {