diff --git a/src/test/php-project/phpunit.xml b/src/test/php-project/phpunit.xml
index 1461496..06d51dd 100644
--- a/src/test/php-project/phpunit.xml
+++ b/src/test/php-project/phpunit.xml
@@ -5,8 +5,8 @@
          cacheDirectory=".phpunit.cache"
          executionOrder="depends,defects"
          requireCoverageMetadata="false"
-         beStrictAboutCoverageMetadata="false"
-         beStrictAboutOutputDuringTests="false"
+         beStrictAboutCoverageMetadata="true"
+         beStrictAboutOutputDuringTests="true"
          failOnRisky="false"
          failOnWarning="true"
          colors="true">
diff --git a/src/test/php-project/tests/Math/AdditionTest.php b/src/test/php-project/tests/Math/AdditionTest.php
index 560c78f..f8fc247 100644
--- a/src/test/php-project/tests/Math/AdditionTest.php
+++ b/src/test/php-project/tests/Math/AdditionTest.php
@@ -6,7 +6,7 @@
 class AdditionTest extends TestCase {
     public function testAdd() {
         $sut = new Addition();
-        $result = $sut->add(5, 3);
-        $this->assertEquals(8, $result);
+        $result = $sut->add(5, 5);
+        $this->assertEquals(10, $result);
     }
 }