public function testComparisons() { $num = new Number(5); $this->assertTrue($num->isPositive()); $this->assertFalse($num->isNegative()); $this->assertFalse($num->isZero()); $this->assertTrue($num->isGreater(4)); $this->assertFalse($num->isLess(4)); $this->assertTrue($num->isEqual(5)); $num->setValue(0); $this->assertTrue($num->isZero()); $this->assertFalse($num->isPositive()); $this->assertFalse($num->isNegative()); }