Contains asserts that the string contains a substring, otherwise it fails the test.

DeepEqual compare the actual value to the expected value and fails the test if they are not "deeply equal".

Equal compare the actual value to the expected value and fails the test if they are not equal.

EqualStringSlice compares two slices and fails the test if they do not contain the same items.

Error asserts that error is not nil, and contains the expected text, otherwise it fails the test.

NilError asserts that the error is nil, otherwise it fails the test.

NotNil fails the test if the object is nil.

TestingT is an interface which defines the methods of testing.T that are required by this package.