Testing multiple exceptions in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of testing multiple exceptions in pytest?

To verify that a function or code block raises any one of several expected exceptions under different error conditions.

beginner

How do you test for multiple exceptions using pytest?

Use the pytest.raises() context manager with a tuple of exception types, like with pytest.raises((TypeError, ValueError)):.

beginner

What happens if the code inside pytest.raises() does not raise any exception?

The test fails because pytest expects an exception to be raised inside the with pytest.raises() block.

intermediate

Can you catch multiple exceptions separately in pytest tests?

Yes, but you write separate with pytest.raises() blocks for each exception to test them individually.

beginner

Example: How to test a function that may raise either ValueError or TypeError?

Use with pytest.raises((ValueError, TypeError)): and call the function inside this block to check if it raises either exception.

Which pytest syntax correctly tests for multiple exceptions?

A with pytest.raises(ValueError, TypeError):

B with pytest.raises(ValueError or TypeError):

C with pytest.raises((ValueError, TypeError)):

D with pytest.raises[ValueError, TypeError]:

Use a tuple of exceptions inside pytest.raises(), like (ValueError, TypeError).

What happens if no exception is raised inside a pytest.raises() block?

A Test is ignored

B Test passes

C Test is skipped

D Test fails

pytest.raises expects an exception; if none is raised, the test fails.

How to test two different exceptions separately in pytest?

A Use one pytest.raises() with both exceptions

B Write two separate pytest.raises() blocks

C Use try-except inside the test

D Use assertRaises twice

Separate pytest.raises() blocks test each exception individually.

Which of these is NOT a valid exception to test with pytest.raises()?

A int

B TypeError

C KeyError

D ValueError

Only exception classes can be tested, not data types like int.

Why test multiple exceptions in one pytest.raises()?

A To check if any one of several errors occurs

B To catch all exceptions silently

C To ignore exceptions

D To speed up tests

Testing multiple exceptions ensures the code raises at least one expected error.

Explain how to use pytest to test that a function raises either ValueError or TypeError.

Think about how pytest.raises accepts multiple exceptions.

Describe what happens when no exception is raised inside a pytest.raises() block and why this is important.

Consider the purpose of testing exceptions.