feat: Publish test coverage summaries to PRs (#513)

.github/actions/post-coverage-comment/action.yml

@@ -0,0 +1,102 @@
+name: 'Post Coverage Comment Action'
+description: 'Prepares and posts a code coverage comment to a PR.'
+
+inputs:
+  cli_json_file:
+    description: 'Path to CLI coverage-summary.json'
+    required: true
+  server_json_file:
+    description: 'Path to Server coverage-summary.json'
+    required: true
+  cli_full_text_summary_file:
+    description: 'Path to CLI full-text-summary.txt'
+    required: true
+  server_full_text_summary_file:
+    description: 'Path to Server full-text-summary.txt'
+    required: true
+  node_version:
+    description: 'Node.js version for context in messages'
+    required: true
+  github_token:
+    description: 'GitHub token for posting comments'
+    required: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Prepare Coverage Comment
+      id: prep_coverage_comment
+      shell: bash
+      run: |
+        cli_json_file="${{ inputs.cli_json_file }}"
+        server_json_file="${{ inputs.server_json_file }}"
+        cli_full_text_summary_file="${{ inputs.cli_full_text_summary_file }}"
+        server_full_text_summary_file="${{ inputs.server_full_text_summary_file }}"
+        comment_file="coverage-comment.md"
+
+        # Extract percentages using jq for the main table
+        if [ -f "$cli_json_file" ]; then
+          cli_lines_pct=$(jq -r '.total.lines.pct' "$cli_json_file")
+          cli_statements_pct=$(jq -r '.total.statements.pct' "$cli_json_file")
+          cli_functions_pct=$(jq -r '.total.functions.pct' "$cli_json_file")
+          cli_branches_pct=$(jq -r '.total.branches.pct' "$cli_json_file")
+        else
+          cli_lines_pct="N/A"; cli_statements_pct="N/A"; cli_functions_pct="N/A"; cli_branches_pct="N/A"
+          echo "CLI coverage-summary.json not found at: $cli_json_file" >&2 # Error to stderr
+        fi
+
+        if [ -f "$server_json_file" ]; then
+          server_lines_pct=$(jq -r '.total.lines.pct' "$server_json_file")
+          server_statements_pct=$(jq -r '.total.statements.pct' "$server_json_file")
+          server_functions_pct=$(jq -r '.total.functions.pct' "$server_json_file")
+          server_branches_pct=$(jq -r '.total.branches.pct' "$server_json_file")
+        else
+          server_lines_pct="N/A"; server_statements_pct="N/A"; server_functions_pct="N/A"; server_branches_pct="N/A"
+          echo "Server coverage-summary.json not found at: $server_json_file" >&2 # Error to stderr
+        fi
+
+        echo "## Code Coverage Summary" > "$comment_file"
+        echo "" >> "$comment_file"
+        echo "| Package | Lines | Statements | Functions | Branches |" >> "$comment_file"
+        echo "|---|---|---|---|---|" >> "$comment_file"
+        echo "| CLI | ${cli_lines_pct}% | ${cli_statements_pct}% | ${cli_functions_pct}% | ${cli_branches_pct}% |" >> "$comment_file"
+        echo "| Server | ${server_lines_pct}% | ${server_statements_pct}% | ${server_functions_pct}% | ${server_branches_pct}% |" >> "$comment_file"
+        echo "" >> "$comment_file"
+
+        # CLI Package - Collapsible Section (with full text summary from file)
+        echo "<details>" >> "$comment_file"
+        echo "<summary>CLI Package - Full Text Report</summary>" >> "$comment_file"
+        echo "" >> "$comment_file"
+        echo '```text' >> "$comment_file"
+        if [ -f "$cli_full_text_summary_file" ]; then
+          cat "$cli_full_text_summary_file" >> "$comment_file"
+        else
+          echo "CLI full-text-summary.txt not found at: $cli_full_text_summary_file" >> "$comment_file"
+        fi
+        echo '```' >> "$comment_file"
+        echo "</details>" >> "$comment_file"
+        echo "" >> "$comment_file"
+
+        # Server Package - Collapsible Section (with full text summary from file)
+        echo "<details>" >> "$comment_file"
+        echo "<summary>Server Package - Full Text Report</summary>" >> "$comment_file"
+        echo "" >> "$comment_file"
+        echo '```text' >> "$comment_file"
+        if [ -f "$server_full_text_summary_file" ]; then
+          cat "$server_full_text_summary_file" >> "$comment_file"
+        else
+          echo "Server full-text-summary.txt not found at: $server_full_text_summary_file" >> "$comment_file"
+        fi
+        echo '```' >> "$comment_file"
+        echo "</details>" >> "$comment_file"
+        echo "" >> "$comment_file"
+
+        echo "_For detailed HTML reports, please see the 'coverage-reports-${{ inputs.node_version }}' artifact from the main CI run._" >> "$comment_file"
+
+    - name: Post Coverage Comment
+      uses: thollander/actions-comment-pull-request@v3
+      if: always()
+      with:
+        file-path: coverage-comment.md # Use the generated file directly
+        comment-tag: code-coverage-summary
+        github-token: ${{ inputs.github_token }}

.github/workflows/ci.yml

@@ -87,11 +87,8 @@ jobs:
       - name: Install dependencies for testing
         run: npm ci # Install fresh dependencies using the downloaded package-lock.json
 
-      - name: Run tests (generate JUnit XML)
-        run: npm run test:ci --workspaces --if-present
-
-      - name: Collect coverage
-        run: npm run coverage # This will run tests again, but also generate coverage
+      - name: Run tests and generate reports
+        run: NO_COLOR=true npm run test:ci
 
       - name: Publish Test Report
         uses: dorny/test-reporter@v1
@@ -108,3 +105,35 @@ jobs:
         with:
           name: coverage-reports-${{ matrix.node-version }}
           path: packages/*/coverage
+
+  post_coverage_comment:
+    name: Post Coverage Comment
+    runs-on: ubuntu-latest
+    needs: test
+    if: always()
+    continue-on-error: true
+    permissions:
+      contents: read # For checkout
+      pull-requests: write # For commenting
+    strategy:
+      matrix:
+        node-version: [20.x] # Should match the test job's matrix
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download coverage reports artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: coverage-reports-${{ matrix.node-version }}
+          path: coverage_artifact # Download to a specific directory
+
+      - name: Post Coverage Comment using Composite Action
+        uses: ./.github/actions/post-coverage-comment # Path to the composite action directory
+        with:
+          cli_json_file: coverage_artifact/cli/coverage/coverage-summary.json
+          server_json_file: coverage_artifact/server/coverage/coverage-summary.json
+          cli_full_text_summary_file: coverage_artifact/cli/coverage/full-text-summary.txt
+          server_full_text_summary_file: coverage_artifact/server/coverage/full-text-summary.txt
+          node_version: ${{ matrix.node-version }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}

package.json

@@ -12,7 +12,7 @@
     "clean": "scripts/clean.sh",
     "prepare": "npm run bundle",
     "test": "npm run test --workspaces",
-    "coverage": "npm run coverage --workspaces --if-present",
+    "test:ci": "npm run test:ci --workspaces --if-present",
     "start": "NODE_ENV=development scripts/start.sh",
     "debug": "NODE_ENV=development DEBUG=1 scripts/start.sh",
     "lint:fix": "eslint . --fix",

packages/cli/package.json

@@ -18,8 +18,7 @@
     "lint": "eslint . --ext .ts,.tsx",
     "format": "prettier --write .",
     "test": "vitest run",
-    "test:ci": "vitest run --reporter=junit --outputFile=junit.xml",
-    "coverage": "vitest run --coverage",
+    "test:ci": "vitest run --coverage",
     "typecheck": "tsc --noEmit",
     "prerelease:version": "node ../../scripts/bind_package_version.js",
     "prerelease:deps": "node ../../scripts/bind_package_dependencies.js",

packages/cli/vitest.config.ts

@@ -10,6 +10,22 @@ import { defineConfig } from 'vitest/config';
 export default defineConfig({
   test: {
     environment: 'jsdom',
-    globals: true, // Optional: enables global APIs like describe, it, expect
+    globals: true,
+    reporters: ['default', 'junit'],
+    outputFile: {
+      junit: 'junit.xml',
+    },
+    coverage: {
+      provider: 'v8',
+      reportsDirectory: './coverage',
+      reporter: [
+        ['text', { file: 'full-text-summary.txt' }],
+        'html',
+        'json',
+        'lcov',
+        'cobertura',
+        ['json-summary', { outputFile: 'coverage-summary.json' }],
+      ],
+    },
   },
 });

packages/server/package.json

@@ -11,8 +11,7 @@
     "lint": "eslint . --ext .ts,.tsx",
     "format": "prettier --write .",
     "test": "vitest run",
-    "test:ci": "vitest run --reporter=junit --outputFile=junit.xml",
-    "coverage": "vitest run --coverage",
+    "test:ci": "vitest run --coverage",
     "typecheck": "tsc --noEmit",
     "prerelease:version": "node ../../scripts/bind_package_version.js",
     "prerelease:deps": "node ../../scripts/bind_package_dependencies.js",

packages/server/vitest.config.ts

@@ -0,0 +1,28 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    reporters: ['default', 'junit'],
+    outputFile: {
+      junit: 'junit.xml',
+    },
+    coverage: {
+      provider: 'v8',
+      reportsDirectory: './coverage',
+      reporter: [
+        ['text', { file: 'full-text-summary.txt' }],
+        'html',
+        'json',
+        'lcov',
+        'cobertura',
+        ['json-summary', { outputFile: 'coverage-summary.json' }],
+      ],
+    },
+  },
+});