Jasmine JavaScript Testing Framework Jasmine JavaScript 4

Question 1

How do you make a Jasmine spy return different values on successive calls?

Accepted Answer

and.returnValues(val1, val2, val3)

Answer

`and.returnValues()` accepts multiple arguments and returns them in sequence on each successive call.

Question 2

Which Jasmine matcher verifies that a function throws an error with a specific message?

Accepted Answer

toThrowError(message)

Answer

`toThrowError()` can accept an error type, message string, or regex to match against the thrown error.

Question 3

What is the role of `jasmine.clock()` in Jasmine tests?

Accepted Answer

Replaces the native timer functions with controllable mock timers

Answer

`jasmine.clock()` installs fake `setTimeout`/`setInterval` implementations that can be advanced manually.

Question 4

After calling `jasmine.clock().install()`, how do you advance fake timers by 500ms?

Accepted Answer

jasmine.clock().tick(500)

Answer

`tick(ms)` moves the fake clock forward by the specified number of milliseconds, firing any due timers.

Question 5

What does `spy.calls.mostRecent()` return?

Accepted Answer

An object with `object` and `args` properties for the last call

Answer

`calls.mostRecent()` returns a call object containing `object` (context), `args`, and `returnValue` for the latest invocation.

Jasmine JavaScript Testing Framework Practice Test