Props returns the properties set; this is what you would expect to find in this.props in React.

Call calls a func with the given name in Props with the given args.

Bool is convenience method to lookup a bool value from state.

State returns the state; what you would expect to find in this.properties in React.

String represents a shallow rendered component. This is in heavy use in assertions, so we try to keep it stable.

HasChanged reports whether the value of the property with any of the given keys has changed.