STEP 9: How do we know if the user's color exists? We should test this before we use the user's input for the stars.

• Luckily, we've made a testing function for this exact scenario!
• In , drag Function Call with Parameter inside get_user_input().
• Change my_function to test_color and my_var to color.
• Click Run and try inputting a color that doesn't exist. See how the computer throws an error?

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