// CORRECT: Don't use when() on spy for methods that modify state doReturn(100).when(spyList).size(); // Safer stubbing assertEquals(100, spyList.size());
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// Using the spy spyList.add("one"); spyList.add("two"); // CORRECT: Don't use when() on spy for
When stubbing a spy, use doReturn() | doThrow() | doAnswer() instead of when() to avoid calling the real method. Vehicle Diagnostics: Vehicle Spy // Real method for
: To find high-probability trade setups based on historical price action and market volume. 4. Vehicle Diagnostics: Vehicle Spy
// Real method for add, stubbed for size spyList.add("hello"); assertEquals(100, spyList.size()); // Stubbed assertEquals(1, spyList.size()); // REAL: No, returns 100! // Wait, that's wrong. Let me correct:
test('SpySetup with mock implementation', () => const addSpy = jest.spyOn(calculator, 'add') .mockImplementation((a, b) => a * b); // Override real logic