Question: Suppose you are given a function that returns the most common character contained in a string. For example, if the string is "aaabbc" then the function should return "a." If the string is empty or has more than one "most common" character, then the function should return null. What test values should you use in unit testing to ensure that this function works correctly?

From: Ace the Programming Interview [Guiness]

Subject: Testing

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