Updated test for 'src/ride-hailing/MissionParams.test.ts' issue #52

[leeyspaul]

Updated test to be more dynamic found in src/ride-hailing/MissionParams.test.ts as mentioned in https://github.com/DAVFoundation/dav-js/issues/52.

Description

Changed constants to mutable variables at lines 4 and 5 and re-arranged code into a beforeEach(() => ...) block.

Related Issue

Motivation and Context

First timers pull request, updating the test to be more dynamic.

How Has This Been Tested?

Running with npm run jest to run all tests. All tests passed.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.