Jasmine JavaScript Testing Framework Jasmine Matchers and Expectations

Question 1

Which Jasmine matcher performs a deep equality check between two objects?

Accepted Answer

toEqual()

Answer

toEqual() recursively compares all properties of objects, while toBe() uses strict reference equality.

Question 2

What comparison operator does toBe() use internally?

Accepted Answer

Strict equality (===)

Answer

toBe() uses === (strict equality) under the hood, so it checks both value and type for primitives and reference identity for objects.

Question 3

Which Jasmine matcher checks that a value is not undefined?

Accepted Answer

toBeDefined()

Answer

toBeDefined() passes when the actual value is anything other than undefined.

Question 4

What does toContain() verify when used with an array?

Accepted Answer

That the array includes the specified element

Answer

toContain() scans the array for an element that strictly equals the expected value using ===.

Question 5

Which matcher verifies that a number is close to an expected value within a decimal precision?

Accepted Answer

toBeCloseTo(num, decimalPlaces)

Answer

toBeCloseTo(num, decimalPlaces) checks that |actual - expected| < 10^(-decimalPlaces) / 2.

Jasmine JavaScript Testing Framework Practice Test