$7.$ Add Tests for matching$\_$parens

The function matching$\_$parens is new, though it is similar to first$\_$in$\_$parens in several ways. First of all, you should include all combinations of parentheses that you did in your tests for first$\_$in$\_$parens. However, matching$\_$parens does not care about what is inside a pair of parentheses, so a test $$A $()$ C$$ with nothing inside parentheses is the same as a test $"$A $($B$)$ C$".$ In addition, matching$\_$parens has a less restrictive precondition, and so it allows possibilities that first$\_$in$\_$parens does not, such as no parentheses or just one half of a pair of parentheses.

Design several test cases for matching$\_$parens and add them to the test procedure tests$\_$matching$\_$parens. You should have at least $7$ significantly different tests.

NOTE: You are expected to use the assert$\_$equals, assert$\_$true, assert$\_$false functions from the introcs module to write tests$\_$matching$\_$parens. Do not use any other assert$\_$ function in the Asserting Tests section of the IntroCS documentation. If you use one of the assert$\_$true or assert$\_$false functions, do not include not as part of the argument. For example, you would use assert$\_$true$($result$)$ instead of assert$\_$false$($not result$)$ or assert$\_$false$($result$)$ instead of assert$\_$true$($not result$).$