Test Writing: Map Has Duplicate Values

Created By: Geoffrey Challen

/ Version: 2021.9.0

Write a method hasDuplicateValues that, given a non-null Map<String, String>, returns true if the map contains duplicate values—meaning that two different keys map to the same value—and false otherwise. Recall that a map can never contain duplicate keys, since the second mapping from the same key overwrites the first.

You should use a Set to solve this problem! You do not need to import Map, Set, or HashSet, since these are already provided for you.

Test Design Challenge

You're challenge is to write tests for this problem described above.

• Provide a method named test that accepts no arguments and does not return a value.
• If the implementation of the class described above is incorrect, your test method should throw an exception.
• If it is correct, do not throw an exception.
• You may want to use Java's assert method