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The tests in this exercise shouldn't take more than a hour or so to complete.
Please make the tests in test\vault.test.js all pass. To get started, fork the repository and make a feature branch for your answers. Once you're done, create a pull request with your answers.
Create a utility function for each answer and rewrite each test to make the assertions pass. If you do not need a function to complete the tests, make a note in the comments above the test.
NOTE: You can use any third party packages you deem necessary to complete the tests.