test: enable parallel circleci builds (#435)

* test: enable parallel circleci builds

* fix: infer parallelism in circle.yml

* fix: expose circle node index to before-script.sh

* fix: add parallel: true to test overrides in circle.yml

circle.yml

@@ -1,16 +1,15 @@
 test:
   override:
-    - ~/.local/bin/circleci-matrix
+    - bash -e scripts/circle/before-script.sh:
+        parallel: true
+    - npm test && npm run test:codecov:
+        parallel: true
 machine:
   node:
     version: 6
   environment:
     NODE_ENV: test
     DATABASE_USERNAME: ubuntu
 dependencies:
-  pre:
-    - mkdir -p ~/.local/bin
-    - curl -fsSL https://git.io/v2Ifs -o ~/.local/bin/circleci-matrix
-    - chmod +x ~/.local/bin/circleci-matrix
   override:
     - bash -e scripts/circle/install.sh

scripts/circle/before-script.sh

@@ -2,19 +2,27 @@
 DROP_DATABASE="DROP DATABASE IF EXISTS lux_test;"
 CREATE_DATABASE="CREATE DATABASE lux_test;"
 
-case "$DATABASE_DRIVER" in
-  pg )
+case $CIRCLE_NODE_INDEX in
+  0)
+    export DATABASE_DRIVER="pg"
+
     psql -c "$DROP_DATABASE" -U postgres
     psql -c "$CREATE_DATABASE" -U postgres
     ;;
 
-  mysql2 )
+  1)
+    export DATABASE_DRIVER="mysql2"
+
     mysql -e "$DROP_DATABASE"
     mysql -e "$CREATE_DATABASE"
     ;;
 
-  sqlite3 )
+  2)
+    export DATABASE_DRIVER="sqlite3"
+
     rm -rf test/test-app/db/lux_test_test.sqlite
     touch test/test-app/db/lux_test_test.sqlite
     ;;
 esac
+
+echo "ENV: DATABASE_DRIVER=$DATABASE_DRIVER"