Implement PR workflow with test262

.circleci/config.yml

@@ -39,6 +39,9 @@ aliases:
   - &artifact_test262_xunit
     path: ~/test-results
 
+  - &artifact_test262_diff_tap
+    path: ~/diff.tap
+
 jobs:
   test:
     working_directory: ~/babel
@@ -69,6 +72,13 @@ jobs:
       - image: circleci/node:12
     steps:
       - checkout
+      - run:
+          name: Sync with latest master branch
+          command: |
+            git config --global user.email "you@example.com"
+            git config --global user.name "Your Name"
+            git fetch origin master
+            git rebase origin/master
       - restore-cache: *restore-yarn-cache
       - restore-cache: *restore-node-modules-cache
       - run:
@@ -86,6 +96,7 @@ jobs:
       - run:
           name: Setup Test Runner
           command: |
+            # Switch to master branch later
             git clone --recurse-submodules https://github.com/babel/babel-test262-runner
             cd babel-test262-runner
             yarn
@@ -102,20 +113,49 @@ jobs:
           <<: *test262_workdir
       - store_artifacts: *artifact_test262_tap
       - run:
-          name: Output test262 results
+          name: Output Test262 results
           command: |
             cat ~/test262.tap | $(npm bin)/tap-mocha-reporter spec || true
           <<: *test262_workdir
+      - run:
+          name: Download master branch Test262 artifact
+          command: node lib/download-master-artifact ~/master.tap
+          <<: *test262_workdir
+      - run:
+          name: Compare previous master branch & current job results
+          command: |
+            mkdir -p ~/test-results/test262
+            node lib/compare-results ~/master.tap ~/test262.tap | $(npm bin)/tap-merge | tee ~/diff.tap
+          <<: *test262_workdir
+      - store_artifacts: *artifact_test262_diff_tap
+      - run:
+          name: Output comparision results and report to CircleCI
+          command: |
+            mkdir -p ~/test-results/test262
+            cat ~/diff.tap | $(npm bin)/tap-mocha-reporter xunit | tee ~/test-results/test262/results.xml || true
+          <<: *test262_workdir
+      - store_test_results: *artifact_test262_xunit
 
 workflows:
   version: 2
   test:
     jobs:
       - test
-  master:
-    jobs:
-      - test262:
-          filters:
-            branches:
-              only:
-                - master
+      - test262
+#   master:
+#     jobs:
+#       - test262:
+#           filters:
+#             branches:
+#               only:
+#                 - master
+#   test262:
+#     jobs:
+#       - test262
+#   test262-after-approval:
+#     jobs:
+#       - approve-test262-run:
+#           type: approval
+#       - test262
+#           requires:
+#             - approve-test262-run