Jasmine JavaScript Testing Framework Jasmine Async Testing 2

Question 1

What does done.fail('reason') do inside a Jasmine async test?

Accepted Answer

Immediately fails the test with the provided reason

Answer

done.fail() is the mechanism for failing an async test from within a callback when an unexpected condition is detected.

Question 2

Which Jasmine feature allows you to control setTimeout and setInterval in tests?

Accepted Answer

jasmine.clock()

Answer

jasmine.clock() provides a mock clock that lets you control time-based functions like setTimeout and setInterval.

Question 3

How do you activate Jasmine's mock clock before a test?

Accepted Answer

jasmine.clock().install()

Answer

install() activates the mock clock, replacing the browser/Node timer functions with Jasmine's controlled versions.

Question 4

After installing the Jasmine clock mock, how do you advance time by 1000ms?

Accepted Answer

jasmine.clock().tick(1000)

Answer

tick(ms) synchronously advances the mocked clock by the given milliseconds, triggering any due timers.

Question 5

What must you do after each test that installed the Jasmine clock mock?

Accepted Answer

Call jasmine.clock().uninstall()

Answer

uninstall() removes the mock clock and restores the real timer functions, preventing leakage into subsequent tests.

Jasmine JavaScript Testing Framework Practice Test