public function testWithMutableTrue() { // Arrange $bigNumber = new BigNumber('0', 10, true); // Act $newBigNumber = $bigNumber->setScale('2'); // Assert $this->assertInstanceOf('PHP\\Math\\BigNumber\\BigNumber', $bigNumber); $this->assertInstanceOf('PHP\\Math\\BigNumber\\BigNumber', $newBigNumber); $this->assertEquals('0.00', $bigNumber->getValue()); $this->assertEquals('0.00', $newBigNumber->getValue()); }