Comparing values (equality, inequality) in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the assertion assert a == b check in pytest?

It checks if the value of a is equal to the value of b. If they are equal, the test passes; if not, it fails.

beginner

How do you assert that two values are not equal in pytest?

Use assert a != b to check that a and b are different. The test passes if they are not equal.

intermediate

Why is it better to use assert a == b instead of if a != b: raise AssertionError in pytest?

Because assert statements are simpler, clearer, and pytest shows detailed error messages automatically when assertions fail.

beginner

What happens if an equality assertion fails in pytest?

The test stops and pytest reports a failure showing the values of both sides to help you understand why they differ.

intermediate

Can you compare complex data types like lists or dictionaries using equality assertions in pytest?

Yes, pytest can compare lists, dictionaries, and other data types using assert a == b. It checks if their contents are the same.

What does assert x != y check in pytest?

A x is not equal to y

B x is less than y

C x is greater than y

D x is equal to y

The assertion assert x != y passes only if x and y are not equal.

If assert a == b fails, what does pytest show?

A An error message showing values of a and b

B A success message

C No message

D A syntax error

Pytest shows an error message with the actual values of a and b to help debug.

Which is the best way to check equality in pytest?

A if a == b: pass else: raise Exception

B return a == b

C print(a == b)

D assert a == b

Using assert a == b is simple and integrates well with pytest reporting.

Can pytest compare two dictionaries with assert dict1 == dict2?

A No, it only compares numbers

B Only if they have the same keys

C Yes, it compares their contents

D Only if they are the same object

Pytest compares dictionaries by checking if all keys and values match.

What does assert a != b do if a and b are equal?

A Passes the test

B Fails the test

C Raises a syntax error

D Ignores the assertion

The assertion fails because it expects a and b to be different.

Explain how to use pytest assertions to check if two values are equal or not equal.

Think about simple assert statements for equality and inequality.

Describe what happens when an equality assertion fails in pytest and why this is helpful.

Consider how pytest reports assertion failures.