valid-expect.md

Pattern: Invalid expect usage

Issue: -

Description

The expect() function must be called with a single argument and followed by a matcher function. Missing arguments, missing matchers, or incorrect matcher usage will cause tests to fail unexpectedly.

Examples

Example of incorrect code:

expect();
expect("something");
expect(value).toBeDefined;
expect(true, false).toBe(true);

Example of correct code:

expect("something").toBe("something");
expect(value).toBeDefined();
expect(Promise.resolve(1)).resolves.toBe(1);