Take a parent context and create a child that totally ignores the parent's cancellation signals (including cancel funcs, deadlines, and timeouts).

Creates a child context that has no Deadline() metadata.

The first time the process receives any of the given signals, cancels the returned context and deregisters the signal handler.

A mock implementation of context.Context allowing specifying the return value of Err() This mock object doesn't implement the other parts of context cancelation/deadline handling, such as the Done() channel.