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phpMyAdmin/vendor/paragonie/constant_time_encoding/tests/HexTest.php

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+<?php
+use \ParagonIE\ConstantTime\Hex;
+
+class HexTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @covers Hex::encode()
+     * @covers Hex::decode()
+     * @covers Hex::encodeUpper()
+     */
+    public function testRandom()
+    {
+        for ($i = 1; $i < 32; ++$i) {
+            for ($j = 0; $j < 50; ++$j) {
+                $random = \random_bytes($i);
+
+                $enc = Hex::encode($random);
+                $this->assertSame(
+                    $random,
+                    Hex::decode($enc)
+                );
+                $this->assertSame(
+                    \bin2hex($random),
+                    $enc
+                );
+
+                $enc = Hex::encodeUpper($random);
+                $this->assertSame(
+                    $random,
+                    Hex::decode($enc)
+                );
+                $this->assertSame(
+                    \strtoupper(\bin2hex($random)),
+                    $enc
+                );
+            }
+        }
+    }
+}