Move RandomTest to SimpleSAML\Test\Utils\RandomTest.

tests/lib/SimpleSAML/Utils/RandomTest.php

 <?php
 
+namespace SimpleSAML\Test\Utils;
+
+use SimpleSAML\Utils\Random;
 
 /**
  * Tests for SimpleSAML\Utils\Random.
  */
-class RandomTest extends PHPUnit_Framework_TestCase
+class RandomTest extends \PHPUnit_Framework_TestCase
 {
 
+    /**
+     * Test for SimpleSAML\Utils\Random::generateID().
+     *
+     * @covers SimpleSAML\Utils\Random::generateID
+     */
     public function testGenerateID()
     {
         // check that it always starts with an underscore
-        $this->assertStringStartsWith('_', SimpleSAML\Utils\Random::generateID());
+        $this->assertStringStartsWith('_', Random::generateID());
 
         // check the length
-        $this->assertEquals(SimpleSAML\Utils\Random::ID_LENGTH, strlen(SimpleSAML\Utils\Random::generateID()));
+        $this->assertEquals(Random::ID_LENGTH, strlen(Random::generateID()));
     }
 }