From the course: Android Espresso Essential Training

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The Espresso formula

The Espresso formula - Android Tutorial

From the course: Android Espresso Essential Training

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The Espresso formula

- [Instructor] To write an Espresso test, we will be using the Espresso formula. There are three parts to the Espresso formula, onView, which takes a ViewMatcher, and then .perform, which takes a ViewAction, and .check, which takes a ViewAssertion. First, we use onView to locate a view on the screen. Once we have the view, we can perform some action on it. For example, clicking, typing, etc. We can also check that it looks as expected. We will be using the Espresso formula in our test. We will use it three times. First, we will check that the text view is empty in the beginning. Then, we will use it to perform the action click. We are going to click on the greet button. Finally, we are going to check that the TextView displays the text "Hello!" Let's write the test.

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