Jasmine JavaScript Testing Framework Jasmine JavaScript for Beginner's 5

Question 1

What is a Jasmine custom matcher and how is it added?

Accepted Answer

A user-defined matcher added via jasmine.addMatchers() in beforeEach

Answer

Custom matchers are objects passed to `jasmine.addMatchers()` inside a `beforeEach`, giving tests domain-specific assertion language.

Question 2

How do you configure Jasmine to run only specs whose descriptions match a pattern?

Accepted Answer

Pass --filter='pattern' on the command line or set spec_filter in jasmine.json

Answer

The `spec_filter` option in `jasmine.json` (or the CLI `--filter` flag) limits which specs run based on a substring or regex match.

Question 3

What does `spy.and.throwError('message')` do when the spy is invoked?

Accepted Answer

Makes the spy throw an Error with the given message

Answer

`and.throwError` configures the spy to throw an Error object containing the specified message whenever called.

Question 4

Which reporter does Jasmine provide for running tests in a Node.js environment via the CLI?

Accepted Answer

ConsoleReporter

Answer

The `ConsoleReporter` (also called the spec reporter) outputs results to stdout, making it the default for Jasmine CLI/Node runs.

Question 5

What does `toMatch` use internally to test string values?

Accepted Answer

A regular expression or string pattern

Answer

`toMatch(pattern)` accepts either a RegExp or a string that is converted to a RegExp, then tests the actual string against it.

Jasmine JavaScript Testing Framework Practice Test