Question: Both before _ space and after _ space have the same preconditions. Add assert statements to both of these functions enforcing the preconditions. Error messages

Both before_space and after_space have the same preconditions. Add assert statements to both of these functions enforcing the preconditions. Error messages are not necessary.
Remember that test scripts are not designed to check assert statements. If you want to check your assert statements, you will need to check them manually:

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