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vendor/phpunit/php-code-coverage/phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/5.7/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         backupGlobals="false"
+         verbose="true">
+    <testsuite>
+        <directory suffix="Test.php">tests/tests</directory>
+    </testsuite>
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+
+    <php>
+        <ini name="serialize_precision" value="14"/>
+    </php>
+</phpunit>
+