how_to.md

Peel

This is for a method where the blocking part is at the outside (top or bottom) of the method

1. Call the Method Example: Method(param1)
2. Select everything that isn't the problem
3. Extract into public method called Method2
4. Call Method2 instead Example:Method2(newParams)

Slice

This is for method where the blocking part is in the middle of the method

1. Call the Method passing null for all params Example: Method(param1)
2. See the failing error:
   Example: Error when calling object.Method(param1,param2);
3. Pass in a mock for the object where the call is failing
4. See the new failing error:
   Example: Unexpected call to object.Method(param1,param2);
5. add Mock behavior for that call
6. repeat

Mock Example

Note: EasyMock requires the expected calls to be in order. Because of this if you use the .times(x) they need to be sequential calls

var listMock = createStrictMock(List.class);
expect(() -> listMock.size()).andReturn(6);
finalizeExpectations(listMock);
Assertions.assertEquals(6, listMock.size());

^{snippet source | anchor}

This also works for methods that return void

var listMock = createStrictMock(List.class);
expect(() -> listMock.clear());
finalizeExpectations(listMock);
listMock.clear();
//listMock.clear(); this would throw an exception

^{snippet source | anchor}

Peel & Slice

1. Call Method
2. See Problem
3. Solve Problem
   1. If at Top or Bottom
      1. Peel
   2. If in Middle
      1. Slice
4. Repeat until done