add composer's vendor directory

vendor/bshaffer/oauth2-server-php/phpunit.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false"
+         bootstrap="test/bootstrap.php"
+>
+  <testsuites>
+    <testsuite name="Oauth2 Test Suite">
+      <directory>./test/OAuth2/</directory>
+    </testsuite>
+  </testsuites>
+
+  <filter>
+    <whitelist>
+      <directory suffix=".php">./src/OAuth2/</directory>
+    </whitelist>
+  </filter>
+</phpunit>