+<?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;
+ }
+}