Add initial tests

Author: Ayesh

phpunit.xml.dist

@@ -5,16 +5,12 @@
          executionOrder="depends,defects"
          beStrictAboutOutputDuringTests="true"
          colors="true"
-         cacheDirectory=".phpunit.cache"
          failOnWarning="true"
          failOnRisky="true"
-         failOnDeprecation="true"
          failOnIncomplete="true"
-         failOnNotice="true"
          failOnEmptyTestSuite="true"
          beStrictAboutChangesToGlobalState="true"
-         testdox="true"
-         beStrictAboutCoverageMetadata="true">
+         testdox="true">
     <testsuites>
         <testsuite name="default">
             <directory>tests</directory>
@@ -26,9 +22,4 @@
             <text outputFile="php://stdout"/>
         </report>
     </coverage>
-    <source>
-        <include>
-            <directory>src</directory>
-        </include>
-    </source>
 </phpunit>

tests/ArrayFindTest.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Polyfills\MbTrimPolyfill\Tests;
+
+use PHPUnit\Framework\TestCase;
+
+class ArrayFindTest extends TestCase {
+
+    public function testArrayFind() {
+        self::assertSame(array_find(['apple', 'banana'], static function($value, $key) {
+            return $value === 'banana';
+        }), 'banana');
+    }
+}