Change 'tests' to 'test'.

phpunit.xml

@@ -1,19 +1,10 @@
 <?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">
+<phpunit bootstrap="./vendor/autoload.php" colors="true">
 
     <testsuites>
-        <testsuite name="Package Test Suite">
-            <directory suffix=".php">./tests/</directory>
+        <testsuite name="all">
+            <directory suffix=".php">./test</directory>
         </testsuite>
     </testsuites>
 
@@ -24,6 +15,7 @@
     </filter>
 
     <logging>
+        <log type="junit" target="build/report.junit.xml"/>
         <log type="coverage-text" target="php://stdout"/>
         <log type="coverage-html" target="build/coverage" charset="UTF-8" yui="true" highlight="true"/>
         <log type="coverage-clover" target="build/logs/clover.xml"/>