Test 3: Testing main.py output...
SUCCESS: main.py prints the correct message!
Output was: Calculator ready!
Testing calculator functions:
add(2, 3) = 5
subtract(5, 3) = 2
multiply(4, 5) = 20
divide(10, 2) = 5.0
divide(10, 0) raised: Cannot divide by zero
All tests passed!
Main output test passed!