Namespace: Should

.equal(actual, expected, [message])

Asserts non-strict equality (==) of actual and expected.

should.equal(3, '3', '== coerces values to strings');

.throw(function, [constructor/string/regexp], [string/regexp], [message])

Asserts that function will throw an error that is an instance of constructor, or alternately that it will throw an error with message matching regexp.

should.throw(fn, 'function throws a reference error');
should.throw(fn, /function throws a reference error/);
should.throw(fn, ReferenceError);
should.throw(fn, ReferenceError, 'function throws a reference error');
should.throw(fn, ReferenceError, /function throws a reference error/);

.exist

Asserts that the target is neither null nor undefined.

var foo = 'hi';

should.exist(foo, 'foo exists');

.not.equal(actual, expected, [message])

Asserts non-strict inequality (!=) of actual and expected.

should.not.equal(3, 4, 'these numbers are not equal');

.throw(function, [constructor/regexp], [message])

Asserts that function will not throw an error that is an instance of constructor, or alternately that it will not throw an error with message matching regexp.

should.not.throw(fn, Error, 'function does not throw');

.not.exist

Asserts that the target is neither null nor undefined.

var bar = null;

should.not.exist(bar, 'bar does not exist');

.fail(actual, expected, [message], [operator])

Throw a failure.