public function testIsValidQuadruple() { $r = new Reference(); $this->assertFalse($r->isValidQuadruple([])); $this->assertFalse($r->isValidQuadruple([1])); $this->assertFalse($r->isValidQuadruple([1, 1, 1])); $this->assertFalse($r->isValidQuadruple([1, 1, 1, 1, 1])); $this->assertFalse($r->isValidQuadruple([0, 0, 0, 0])); $this->assertTrue($r->isValidQuadruple([1, 1, 1, 1])); $this->assertTrue($r->isValidQuadruple([999, 999, 999, 999])); $this->assertFalse($r->isValidQuadruple([1000, 1000, 1000, 1000])); }