Unparallelizes test suites until there are enough tests to make the build setup time cost worth it.

Author: dsposito

.travis.yml

@@ -4,11 +4,6 @@ php:
   - '7.0'
   - '7.1'
 
-# Configure environment to run test suites in parallel.
-env:
-  - TEST_SUITE = "Unit Tests"
-  - TEST_SUITE = "Integration Tests"
-
 # Install test coverage package.
 install:
   - composer require satooshi/php-coveralls
@@ -20,7 +15,7 @@ before_script:
 
 # Run tests and generate test coverage report.
 script:
-  - phpunit -d api_key=$API_KEY --testsuite "$TEST_SUITE" --coverage-clover build/logs/clover.xml
+  - phpunit -d api_key=$API_KEY --coverage-clover build/logs/clover.xml
 
 # Submit test coverage report to Coveralls.
 after_success: