Move random Digits to Crypto class

tests/src/Util/CryptoTest.php

@@ -0,0 +1,131 @@
+<?php
+
+// this is in the same namespace as Install for mocking 'rand' and 'random_init'
+namespace Friendica\Util;
+
+use PHPUnit\Framework\TestCase;
+
+class CryptoTest extends TestCase
+{
+	/**
+	 * Replaces function_exists results with given mocks
+	 *
+	 * @param array $functions a list from function names and their result
+	 */
+	private function setFunctions($functions)
+	{
+		global $phpMock;
+		$phpMock['function_exists'] = function($function) use ($functions) {
+			foreach ($functions as $name => $value) {
+				if ($function == $name) {
+					return $value;
+				}
+			}
+			return '__phpunit_continue__';
+		};
+	}
+
+	/**
+	 * Replaces rand results with given mocks
+	 *
+	 */
+	private function assertRand($min, $max)
+	{
+		global $phpMock;
+		$phpMock['rand'] = function($mMin, $mMax) use ($min, $max) {
+			$this->assertEquals($min, $mMin);
+			$this->assertEquals($max, $mMax);
+			return 1;
+		};
+	}
+
+	/**
+	 * Replaces rand results with given mocks
+	 *
+	 */
+	private function assertRandomInt($min, $max)
+	{
+		global $phpMock;
+		$phpMock['random_int'] = function($mMin, $mMax) use ($min, $max) {
+			$this->assertEquals($min, $mMin);
+			$this->assertEquals($max, $mMax);
+			return 1;
+		};
+	}
+
+	public function testRandomDigitsRand()
+	{
+		$this->setFunctions(['random_int' => false]);
+		$this->assertRand(0, 9);
+
+		$test = Crypto::randomDigits(1);
+		$this->assertEquals(1, strlen($test));
+		$this->assertEquals(1, $test);
+
+		$test = Crypto::randomDigits(8);
+		$this->assertEquals(8, strlen($test));
+		$this->assertEquals(11111111, $test);
+	}
+
+
+	public function testRandomDigitsRandomInt()
+	{
+		$this->setFunctions(['random_int' => true]);
+		$this->assertRandomInt(0, 9);
+
+		$test = Crypto::randomDigits(1);
+		$this->assertEquals(1, strlen($test));
+		$this->assertEquals(1, $test);
+
+		$test = Crypto::randomDigits(8);
+		$this->assertEquals(8, strlen($test));
+		$this->assertEquals(11111111, $test);
+	}
+}
+
+/**
+ * A workaround to replace the PHP native function_exists() with a mocked function
+ *
+ * @param string $function_name the Name of the function
+ *
+ * @return bool true or false
+ */
+function function_exists($function_name)
+{
+	global $phpMock;
+	if (isset($phpMock['function_exists'])) {
+		$result = call_user_func_array($phpMock['function_exists'], func_get_args());
+		if ($result !== '__phpunit_continue__') {
+			return $result;
+		}
+	}
+	return call_user_func_array('\function_exists', func_get_args());
+}
+
+/**
+ * A workaround to replace the PHP native rand() (< 7.0) with a mocked function
+ *
+ * @return int
+ */
+function rand($min, $max)
+{
+	global $phpMock;
+	if (isset($phpMock['rand'])) {
+		$result = call_user_func_array($phpMock['rand'], func_get_args());
+		return $result;
+	}
+}
+
+/**
+ * A workaround to replace the PHP native random_int() (>= 7.0) with a mocked function
+ *
+ * @return int
+ */
+function random_int($min, $max)
+{
+	global $phpMock;
+	if (isset($phpMock['random_int'])) {
+		$result = call_user_func_array($phpMock['random_int'], func_get_args());
+		return $result;
+	}
+}