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jv-lambda-calc

Write a calculator. Method calculate() should accept three parameters: two values of type double and operation of type char. This method should be able to perform the following operations:

  • Addition
  • Subtraction
  • Division
  • Multiplication
  • raising to a power

In your test class you should cover such test cases:

  • addition with 2 positive operands;
  • addition with 2 negative operands;
  • addition with positive and negative operands;
  • addition with zero in different places;
  • addition for min and max double values;
  • same for subtraction;
  • same for multiplication;
  • same for division (check division by 0);
  • raising positive/negative value to the positive power;
  • raising positive/negative value to the negative power;
  • raising positive/negative value to zero power;
  • raising zero to power;
  • illegal operation;

P.S. Feel free to cover other test cases.

In some cases, you'll have to use delta value in assertEquals for doubles. Difference should be less than DELTA in order for test to pass; For example:

   double expected = 2.0005;
   double actual = 2.00041;
   double delta = 0.0001;
   assertEquals(expected, actual, delta);
//test passed

There are a lot of ways to name your test methods. The main point is that they should have informative names and be consistent along with other developers in your team. For this task use such convention: <methodUnderTest>_<state>_<expectedBehavior>; For example, if we are testing the method calculate with an illegal character passed as an operation the test method name should be calculate_illegalOperation_notOk. notOk is because the test expects the calculate method to throw an exception.

Try to avoid these common mistakes while solving the task