First attempt at implementing PR workflow

.circleci/config.yml

@@ -86,8 +86,11 @@ jobs:
       - run:
           name: Setup Test Runner
           command: |
-            git clone --recurse-submodules https://github.com/babel/babel-test262-runner
+            # Switch to master branch later
+            git clone --recurse-submodules https://github.com/jbhoosreddy/babel-test262-runner
             cd babel-test262-runner
+            git fetch origin compare-master-results
+            git checkout compare-master-results
             yarn
             yarn add tap-mocha-reporter --dev
             curl -L https://github.com/stedolan/jq/releases/download/jq-1.5/jq-linux64 > jq
@@ -102,10 +105,21 @@ 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 master branch & PR results
+          command: |
+            mkdir -p ~/test-results/test262
+            node lib/compare-results ~/master.tap ~/test262.tap | $(npm bin)/tap-mocha-reporter xunit | tee ~/test-results/test262/results.xml
+          <<: *test262_workdir
+      - store_test_results: *artifact_test262_xunit
 
 
 workflows:
@@ -120,3 +134,10 @@ workflows:
             branches:
               only:
                 - master
+test262-after-approval:
+    jobs:
+      # - approve-test262-run:
+      #     type: approval
+      - test262
+          # requires:
+          #   - approve-test262-run