!3 Use the "error" keyword when you expect an error. In this case, an error turns the cell a nice shade of green!
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This example uses a fixture that has string property and two string methods that throw errors - one that throws it directly and one that throws it by delegating to another method that throws an error.

When you use the error keyword and errors are received the cells turn green.
|error throwing fixture|
|error throwing method()|error throwing property()|redirect to error throwing method()|
|error|error|error|
