Check to ensure 100% test coverage is retained

.travis.yml

@@ -17,21 +17,22 @@ matrix:
       env:
         - CS_CHECK=true
     - php: 7.1
-    - php: hhvm 
+    - php: hhvm
   allow_failures:
     - php: hhvm
 
 before_install:
   - if [[ $TEST_COVERAGE != 'true' ]]; then phpenv config-rm xdebug.ini || return 0 ; fi
   - composer self-update
   - if [[ $TEST_COVERAGE == 'true' ]]; then composer require --dev --no-update satooshi/php-coveralls:^1.0 ; fi
+  - if [[ $TEST_COVERAGE == 'true' ]]; then composer require --dev --no-update michaelmoussa/php-coverage-checker:^1.1.0 ; fi
 
 install:
   - travis_retry composer install --no-interaction
   - composer info -i
 
 script:
-  - if [[ $TEST_COVERAGE == 'true' ]]; then composer test-coverage ; else composer test ; fi
+  - if [[ $TEST_COVERAGE == 'true' ]]; then composer test-coverage && vendor/bin/php-coverage-checker clover.xml 100 ; else composer test ; fi
   - if [[ $CS_CHECK == 'true' ]]; then composer cs ; fi
   - if [[ $CS_CHECK == 'true' ]]; then composer license-check ; fi