public function testGetCalculatedRate()
{
$productTaxClassId = 1;
$customerId = 2;
$storeId = 3;
$rate = 0.5;
$storeMock = $this->getMock('\\Magento\\Store\\Model\\Store', ['getStoreId'], [], '', false);
$this->storeManager->expects($this->once())->method('getStore')->willReturn($storeMock);
$storeMock->expects($this->once())->method('getStoreId')->willReturn($storeId);
$rateRequestMock = $this->getMock('\\Magento\\Framework\\DataObject', ['setProductClassId'], [], '', false);
$this->calculationTool->expects($this->once())->method('getRateRequest')->with(null, null, null, $storeId, $customerId)->willReturn($rateRequestMock);
$rateRequestMock->expects($this->once())->method('setProductClassId')->with($productTaxClassId)->willReturnSelf();
$this->calculationTool->expects($this->once())->method('getRate')->with($rateRequestMock)->willReturn($rate);
$this->assertEquals($rate, $this->taxCalculationService->getCalculatedRate($productTaxClassId, $customerId, null));
}