Jasmine JavaScript Testing Framework Jasmine Custom Matchers and Extensions

Question 1

Which Jasmine method is used to register custom matchers so they are available in specs?

Accepted Answer

jasmine.addMatchers()

Answer

jasmine.registerMatcher()

Answer

jasmine.extendMatchers()

Answer

jasmine.createMatcher()

Question 2

Where should jasmine.addMatchers() typically be called to ensure custom matchers are available for every spec in a suite?

Accepted Answer

Inside a beforeEach block

Answer

Inside an afterEach block

Answer

Inside an it block

Answer

At the top level outside any describe

Question 3

What does jasmine.objectContaining({ name: 'Alice' }) do when used in an expectation?

Accepted Answer

Passes if the actual object has at least a name property equal to 'Alice'

Answer

Passes only if the actual object is exactly { name: 'Alice' }

Answer

Fails if the actual object has any extra properties

Answer

Checks that the object is a class instance named Alice

Question 4

What must a custom matcher factory function return?

Accepted Answer

An object with a compare function

Answer

A boolean value

Answer

A Promise

Answer

A string describing the matcher

Question 5

What does the compare function inside a custom matcher need to return?

Accepted Answer

An object with a pass property (boolean) and optionally a message

Answer

A boolean true or false

Answer

The difference between actual and expected

Answer

A new Error object

Question 6

What does jasmine.arrayContaining(['a', 'b']) check?

Accepted Answer

That the actual array contains at least 'a' and 'b' elements

Answer

That the actual array is exactly ['a', 'b']

Answer

That 'a' and 'b' are the first two elements

Answer

That the array length equals 2

Question 7

What argument types does jasmine.stringMatching() accept?

Accepted Answer

A string or a RegExp

Answer

Only a string

Answer

Only a RegExp

Answer

A string and a flags object