+
+ /**
+ * Test arrays_combine
+ */
+ public function testCartesianProductGenerator()
+ {
+ $arr = [['ab', 'cd'], ['ef', 'gh'], ['ij', 'kl'], ['m']];
+ $expected = [
+ ['ab', 'ef', 'ij', 'm'],
+ ['ab', 'ef', 'kl', 'm'],
+ ['ab', 'gh', 'ij', 'm'],
+ ['ab', 'gh', 'kl', 'm'],
+ ['cd', 'ef', 'ij', 'm'],
+ ['cd', 'ef', 'kl', 'm'],
+ ['cd', 'gh', 'ij', 'm'],
+ ['cd', 'gh', 'kl', 'm'],
+ ];
+ $this->assertEquals($expected, iterator_to_array(cartesian_product_generator($arr)));
+ }
+
+ /**
+ * Test date_format() with invalid parameter.
+ */
+ public function testDateFormatInvalid()
+ {
+ $this->assertFalse(format_date([]));
+ $this->assertFalse(format_date(null));
+ }