add phpunit config

Author: seregazhuk

phpunit.xml

@@ -0,0 +1,29 @@
+<?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="ReactPHP Memcached Cache Test Suite">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">./src/</directory>
+        </whitelist>
+    </filter>
+    <logging>
+        <log type="coverage-clover" target="./build/logs/clover.xml"/>
+        <log type="coverage-html" target="./build/logs/report" charset="UTF-8"
+             yui="true" highlight="true"
+             lowUpperBound="50" highLowerBound="80"/>
+    </logging>
+</phpunit>