Combine rails test runs to fix coverage reporting (publiclab#5322)

* Combine rails test runs

* remove -d

.travis.yml

@@ -33,8 +33,7 @@ script:
   - docker-compose exec web bash -c "mv chromedriver /usr/local/bin/chromedriver"
   - docker-compose exec web bash -c "chmod +x /usr/local/bin/chromedriver"
   - docker-compose exec web bash -c "CI=TRUE GENERATE_REPORT=true rake test:all"
-  - docker-compose exec web bash -c "CI=TRUE GENERATE_REPORT=true rails test -d"
-  - docker-compose exec web bash -c "CI=TRUE GENERATE_REPORT=true rails test:system"
+  - docker-compose exec web bash -c "CI=TRUE GENERATE_REPORT=true rails test:system test"
   - echo -e '<?xml version="1.0" encoding="UTF-8"?>' > output.xml
   - tail -n +2 -q ./test/reports/TEST*.xml >> output.xml
   - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then danger --verbose; fi'