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Overview
Creating an assertion
function expect
class Assertion

constructor
value
name
not
asArray
asBoolean
asString
asNumber
asJSONString
toBe
toBeOneOf
toEqual
toEqualOneOf
toBeLessThan
toBeGreaterThan
toBeLessThanOrEqualTo
toBeGreaterThanOrEqualTo
toBeTruthy
toBeFalsy
toBeUndefined
toBeDefined
toBeNull
toBeNaN

toBeTypeOf
toBeArray
toBeInstanceOf
toMatchRegExp
toHaveProperty
toHaveProperties
toHaveMethod
toThrowError
toThrowErrorAsync

class NegatedAssertion
Conversion
Chaining assertions

Test context
Web platform
Web context
Navigation
CSS
DOM mounting

class Assertion method

toBeNaN

Asserts that the value is NaN.

toBeNaN(): void

Related

class AssertionRepresents a value ready to be asserted.