TaxCalculatorTest: first test in red because it is not implemented
Test implementation provided. It does not compile
SUT implementarion provided. Test in green.
Provided boundary values. Test in red.
Provided implementation for boundary values in SUT. Test in green
Test amount between 500,000.00 and 1,000,000.00. Test in red.
Test in green to 500,000.00 < amount < 1,000,000.00
Added boundary values for test with amount in second stretch
Second stretch test in green