ci: parallelize interop tests

.circleci/config.yml

@@ -146,6 +146,7 @@ jobs:
     executor: node
     environment:
       IPFS_GO_EXEC: /tmp/circleci-workspace/bin/ipfs
+    parallelism: 4
     steps:
       - *make_out_dirs
       - attach_workspace:
@@ -171,7 +172,7 @@ jobs:
       - run:
           name: Installing reporting tools
           command: |
-            npm install --save mocha-junit-reporter@1.23.1 mocha-multi-reporters@1.1.0
+            npm install --save-dev mocha-junit-reporter@1.23.1 mocha-multi-reporters@1.1.0
           working_directory: ~/ipfs/go-ipfs/interop
       - run:
           name: Running tests
@@ -179,7 +180,8 @@ jobs:
             mkdir -p /tmp/test-results/interop/
             export MOCHA_FILE="$(mktemp /tmp/test-results/interop/unit.XXXXXX.xml)"
             echo '{"reporterEnabled": "mocha-junit-reporter, spec"}' > mocha-conf.json
-            node_modules/.bin/mocha test/node.js -R mocha-multi-reporters --reporter-options "configFile=mocha-conf.json"
+            node_modules/.bin/mocha -R mocha-multi-reporters --reporter-options "configFile=mocha-conf.json" \
+              $(sed -n -e "s|^require('\(.*\)')$|test/\1|p" test/node.js | circleci tests split)
           working_directory: ~/ipfs/go-ipfs/interop
           environment:
             IPFS_REUSEPORT: false