Add PHPUnit settings files

Author: Andreu Correa

phpunit.php

@@ -0,0 +1,3 @@
+<?php
+
+include __DIR__.'/vendor/autoload.php';

phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="./phpunit.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="true"
+         verbose="true"
+>
+    <testsuites>
+        <testsuite name="bignumbers/tests">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">./src/</directory>
+        </whitelist>
+    </filter>
+    <logging>
+        <log type="coverage-text" target="php://stdout" showUncoveredFiles="true"/>
+        <log type="coverage-html" target="coverage" showUncoveredFiles="true"/>
+        <log type="coverage-clover" target="coverage.xml" showUncoveredFiles="true"/>
+    </logging>
+</phpunit>