When the user tries to login without entering anything in the password field, the app should display the message "Please fill out this field." under that field.

Write a test case for this scenario, using the format shown in the last chapter. The username "testuser1" can be used in this case.

The priority of this test is High and one of the prerequisites is that an account with the username "testuser1" should be already registered in the database.

You can either write the Test Case in the following chatbox, or locally, and compare it with the provided solution for verification.