configure PHPUnit for Travis CI

Author: Minishlink

.travis.yml

@@ -7,7 +7,6 @@ php:
   - hhvm
 
 before_script:
-  - composer self-update
-  - composer install --prefer-source --no-interaction --dev
+  - composer install --prefer-source -n
 
-script: phpunit
+script: phpunit -c phpunit.travis.xml

phpunit.travis.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false">
+    <testsuites>
+        <testsuite name="WebPush Test Suite">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>