Volume.test.js file is to test on the calculations for the Volume.js file.

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Describe your change:

• [v] Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• [v ] I have read CONTRIBUTING.md.
• [v ] This pull request is all my own work -- I have not plagiarized.
• [v ] I know that pull requests will not be merged if they fail the automated tests.
• [v ] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [v ] All new JavaScript files are placed inside an existing directory.
• [v ] All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• [v ] All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• [v ] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.