Jasmine JavaScript Testing Framework Jasmine JavaScript for Beginner's 4

Question 1

What does `spy.and.callThrough()` do?

Accepted Answer

Allows the spy to call the original underlying function while still tracking calls

Answer

`callThrough` keeps the spy active for tracking purposes but also delegates to the real implementation.

Question 2

Which Jasmine matcher checks that a number is within a given precision range?

Accepted Answer

toBeCloseTo()

Answer

`toBeCloseTo(expected, precision)` compares floating-point numbers up to a specified number of decimal places.

Question 3

What happens when a Jasmine spec's `expect` assertion fails?

Accepted Answer

Only that spec is marked as failed; subsequent specs still run

Answer

A failed expectation marks the spec as failed but Jasmine continues running remaining specs in the suite.

Question 4

How do you assert that a function throws an error in Jasmine?

Accepted Answer

Both B and C are correct

Answer

You pass the function reference (not its return value) to `expect`; both `toThrow()` and `toThrowError()` are valid matchers.

Question 5

What is the role of Jasmine's `jasmine.clock()` utility?

Accepted Answer

Replaces native timer functions to control time in tests

Answer

`jasmine.clock().install()` replaces `setTimeout` and `setInterval` with controllable fakes, letting you tick time manually.

Jasmine JavaScript Testing Framework Practice Test