[CDATA[ */ The jest object is automatically in scope within every test file. We have barely scratched the surface of what these packages have to offer. The methods in the jest object help create mocks and let you control Jest's overall behavior. When a '#' is encountered, it is considered as a empty node and None is returned. expect.stringContaining(string) matches the received value if it is a string that contains the exact expected string. I have create a button that will only embed some element to keep the same style constantly. 1. var windowOpen; Automatically clear mock calls and instances before every test. Creating our first test. Unit tests fail when using PCOV with --coverage. Pool Installation Contract Template, Deserializing: To deserialize a string to form a tree, the first word in the space seperated string is considered as the root.