Try composer install phpunit

.travis.yml

@@ -19,13 +19,13 @@ install:
   - composer install
 
 before_script:
-  - if [[ $HHVM == true ]]; then curl -sSfL -o ~/.phpenv/versions/hhvm/bin/phpunit https://phar.phpunit.de/phpunit-5.7.phar; fi
-  - phpunit --version
   - mkdir -p build/logs
   - cd tests
 
 script:
-  - phpunit --colors --coverage-clover ../build/logs/clover.xml .
+  - if [[ $HHVM == true ]]; then ./vendor/bin/phpunit --colors --coverage-clover ../build/logs/clover.xml .; fi
+  - if [[ $HHVM != true ]]; then phpunit --colors --coverage-clover ../build/logs/clover.xml .; fi
+
 
 after_success:
   - cd ..

composer.json

@@ -1,23 +1,26 @@
 {
-    "name":        "joshtronic/php-loremipsum",
+    "name": "joshtronic/php-loremipsum",
     "description": "Lorem ipsum generator in PHP without dependencies",
-    "version":     "1.0.2",
-    "type":        "library",
-    "keywords":    ["lorem", "ipsum", "generator"],
-    "homepage":    "https://github.com/joshtronic/php-loremipsum",
-    "license":     "MIT",
+    "version": "1.0.2",
+    "type": "library",
+    "keywords": ["lorem", "ipsum", "generator"],
+    "homepage": "https://github.com/joshtronic/php-loremipsum",
+    "license": "MIT",
     "authors": [{
-        "name":     "Josh Sherman",
-        "email":    "josh@gravityblvd.com",
-        "homepage": "http://joshtronic.com"
+        "name": "Josh Sherman",
+        "email": "josh@gravityblvd.com",
+        "homepage": "https://joshtronic.com"
     }],
     "require": {
         "php": ">=5.3.0"
     },
     "require-dev": {
+        "phpunit/phpunit": "5.7.*",
         "satooshi/php-coveralls": "~1.0"
     },
     "autoload": {
-        "psr-4": {"joshtronic\\": "src/"}
+        "psr-4": {
+          "joshtronic\\": "src/"
+        }
     }
 }