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- Hello again, and welcome to lesson five.

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This is the first of
two lessons on mocking.

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We begin by showing how to
define a mock function in Jest

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and how to use the mock
property to gain insight

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into how the mock function
was called by our code.

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Then we'll see how to use
mock functions to mock an API

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and how to mock all the functions

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in an entire JavaScript model.

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To wrap up the lesson, we'll
see how to test promises

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and show how to use these
techniques to mock REST calls.