Jasmine JavaScript Testing Framework Jasmine Custom Matchers and Extensions 2

Question 1

In the custom matcher compare function signature compare(actual, expected), what does 'actual' represent?

Accepted Answer

The value passed to expect()

Answer

The value passed to the matcher call

Answer

The Jasmine environment object

Answer

The test description string

Question 2

How does Jasmine use a custom matcher's negated failure message when .not is used?

Accepted Answer

It calls negativeCompare if defined, otherwise it uses the default pass negation with the same message

Answer

It automatically prepends 'NOT' to the message

Answer

It calls the message function with a false argument

Answer

It ignores the message property entirely

Question 3

What does jasmine.any(Constructor) match?

Accepted Answer

Any value that is an instance of the given Constructor or primitive type

Answer

Any value that is strictly equal to Constructor

Answer

Any value that is not null

Answer

Any function whose name matches Constructor

Question 4

What is jasmine.anything() used for in expectations?

Accepted Answer

Matches any value except null and undefined

Answer

Matches every possible JavaScript value including null

Answer

Matches only truthy values

Answer

Matches only objects and arrays

Question 5

Which custom matcher utility parameter gives access to equality testers when implementing deep equality in a custom matcher?

Accepted Answer

util (the jasmine utility object with matchersUtil.equals)

Answer

env (the Jasmine environment)

Answer

ctx (the context object)

Answer

spec (the current spec reference)

Question 6

When you define a custom matcher with jasmine.addMatchers() inside a beforeEach, in which scope are those matchers available?

Accepted Answer

Only within the describe block that contains the beforeEach

Answer

Globally across all specs in the file

Answer

Only in the afterEach of the same describe

Answer

Only in the first it block

Question 7

What is the purpose of jasmine.nothing() used as an asymmetric matcher?

Accepted Answer

Asserts that a spy was called with no arguments or matches any call with no arguments

Answer

Asserts the value is null

Answer

Asserts the function returns undefined

Answer

Asserts there are no properties on the object