Should.js Assertions

Question 1

.ok

Answer 1

Asserts true

Question 2

.true

Answer 2

Assert === true:

Question 3

.false

Answer 3

Assert === false:

Question 4

.arguments

Answer 4

var args = (function(){ return arguments; })(1,2,3);
args.should.be.arguments;
[].should.not.be.arguments;

Question 5

.empty

Answer 5

[].should.be.empty
‘‘.should.be.empty
({ length: 0 }).should.be.empty

Question 6

.eql

Answer 6

Asserts equality

({ foo: ‘bar’ }).should.eql({ foo: ‘bar’ })

[1,2,3].should.eql([1,2,3])

Question 7

equal

Answer 7

Strict Equality

should. strictEqual(undefined, value)
should. strictEqual(false, value)
(4) .should.equal(4)

‘test’.should.equal(‘test’)

[1,2,3].should.not.equal([1,2,3])

Question 8

.within

Answer 8

Assert inclusive numeric range:

user.age.should.be.within(5, 50)

Question 9

.a(‘typeof’)

Answer 9

Asserts typeof

user.should.be.a(‘object’)
‘test’.should.be.a(‘string’)

Question 10

instanceof

Answer 10

user.should.be.an.instanceof(User)

[].should.be.an.instanceOf(Array)

Question 11

.above( int )

Answer 11

Assert numeric value above the given value:

user. age.should.be.above(5)
user. age.should.not.be.above(100)

Question 12

.below( int )

Answer 12

Assert numeric value below the given value:

Question 13

.match

Answer 13

Assert regexp match:

username.should.match(/^\w+$/)

Question 14

.length( int )

Answer 14

Assert length property exists and has a value of the given number:

user. pets.should.have.length(5)
user. pets.should.have.a.lengthOf(5)

Question 15

.property

Answer 15

Assert property exists and has optional value:

user. should.have.property(‘name’)
user. should.have.property(‘age’, 15)
user. should.not.have.property(‘rawr’)
user. should.not.have.property(‘age’, 0)

Question 16

.ownProperty

Answer 16

Asserts own property.

Question 17

.status(code)

Answer 17

Assets status code is ###.

Question 18

.header(field[, value])

Answer 18

Asserts that a .headers object with field and optional value are present:

Question 19

.json

Answer 19

Assert that Content-Type is “application/json; charset=utf-8”

Question 20

.html

Answer 20

Assert that Content-Type is “text/html; charset=utf-8”

Question 21

include(obj)

Answer 21

Assert that the given obj is present via indexOf(), so this works for strings, arrays, or custom objects implementing indexOf.

Question 22

includeEql(obj)

Answer 22

Assert that an object equal to the given obj is present in an Array:

Question 23

throw()

Answer 23

Assert an exception is thrown

Question 24

throwError()

Answer 24

An alias of throw, its purpose is to be an option for those who run jshint in strict mode.

Question 25

keys

Answer 25

Assert own object keys, which must match exactly, and will fail if you omit a key or two:

Question 26

.and

Answer 26

Provide a AND relationship between asserts.

Question 27

.have

Answer 27

Provides an assert requirement.

Question 28

.have

Answer 28

Provides an assert requirement.

Question 29

.true

Answer 29

Assert === true:

Question 30

.false

Answer 30

Assert === false:

Question 31

.arguments

Answer 31

var args = (function(){ return arguments; })(1,2,3);
args.should.be.arguments;
[].should.not.be.arguments;

Question 32

.empty

Answer 32

[].should.be.empty
‘‘.should.be.empty
({ length: 0 }).should.be.empty

Question 33

.eql

Answer 33

Asserts equality

({ foo: ‘bar’ }).should.eql({ foo: ‘bar’ })

[1,2,3].should.eql([1,2,3])

Question 34

equal

Answer 34

Strict Equality

should. strictEqual(undefined, value)
should. strictEqual(false, value)
(4) .should.equal(4)

‘test’.should.equal(‘test’)

[1,2,3].should.not.equal([1,2,3])

Question 35

.within

Answer 35

Assert inclusive numeric range:

user.age.should.be.within(5, 50)

Question 36

.a(‘typeof’)

Answer 36

Asserts typeof

user.should.be.a(‘object’)
‘test’.should.be.a(‘string’)

Question 37

instanceof

Answer 37

user.should.be.an.instanceof(User)

[].should.be.an.instanceOf(Array)

Question 38

.above( int )

Answer 38

Assert numeric value above the given value:

user. age.should.be.above(5)
user. age.should.not.be.above(100)

Question 39

.below( int )

Answer 39

Assert numeric value below the given value:

Question 40

.match

Answer 40

Assert regexp match:

username.should.match(/^\w+$/)

Question 41

.length( int )

Answer 41

Assert length property exists and has a value of the given number:

user. pets.should.have.length(5)
user. pets.should.have.a.lengthOf(5)

Question 42

.property

Answer 42

Assert property exists and has optional value:

user. should.have.property(‘name’)
user. should.have.property(‘age’, 15)
user. should.not.have.property(‘rawr’)
user. should.not.have.property(‘age’, 0)

Question 43

.ownProperty

Answer 43

Asserts own property.

Question 44

.status(code)

Answer 44

Assets status code is ###.

Question 45

.header(field[, value])

Answer 45

Asserts that a .headers object with field and optional value are present:

Question 46

.json

Answer 46

Assert that Content-Type is “application/json; charset=utf-8”

Question 47

.html

Answer 47

Assert that Content-Type is “text/html; charset=utf-8”

Question 48

include(obj)

Answer 48

Assert that the given obj is present via indexOf(), so this works for strings, arrays, or custom objects implementing indexOf.

Question 49

includeEql(obj)

Answer 49

Assert that an object equal to the given obj is present in an Array:

Question 50

throw()

Answer 50

Assert an exception is thrown

Question 51

throwError()

Answer 51

An alias of throw, its purpose is to be an option for those who run jshint in strict mode.

Question 52

keys

Answer 52

Assert own object keys, which must match exactly, and will fail if you omit a key or two:

Question 53

.and

Answer 53

Provide a AND relationship between asserts.

Question 54

.have

Answer 54

Provides an assert requirement.