Arrange-Act-Assert structure

Descriptive test names

pytest.raises with match parameter

Initial state assertion

Post-operation state assertion

Parametrize decorator used

Boundary and empty cases

All error paths covered

Collection length assertion

Collection membership assertion

Specific equality assertions

Exception message asserted

toBe or toEqual for value equality

toContain for membership

toHaveLength for array length

toThrow with message string

describe blocks for grouping

Single behavior per test

All throw paths tested

Sorted/ordered result asserted

Empty state tested

Post-mutation state tested

Boolean result tested

Multiple tag sources in getAllTags

assertThat fluent equality

assertThat list contains

assertThat list size

assertThatThrownBy with isInstanceOf

hasMessage chained on assertThatThrownBy

assertThat boolean matchers

Explanatory phase comments

All exception paths covered

Empty cart state tested

List membership and size both asserted

Multiple exception classes tested

Numeric calculation asserted