Add integration tests for NIP-1

[cameri]

Description

1. Refactor application entry point to make it easier to test
2. Add cucumber library
3. Rename test & test:watch script to test:unit and test:unit:watch respectively

Related Issue

#5

Motivation and Context

Needed to refactor the application entry-point so that it can easily be tested with integration tests.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Non-functional change (docs, style, minor refactor)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

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

[coveralls]

Pull Request Test Coverage Report for Build 3342916036

• 10 of 84 (11.9%) changed or added relevant lines in 9 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-1.3%) to 69.318%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/adapters/web-server-adapter.ts	0	1	0.0%
src/adapters/web-socket-adapter.ts	0	3	0.0%
src/adapters/web-socket-server-adapter.ts	0	3	0.0%
src/factories/app-factory.ts	0	6	0.0%
src/index.ts	0	7	0.0%
src/app/worker.ts	0	14	0.0%
src/factories/worker-factory.ts	0	16	0.0%
src/app/app.ts	0	24	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/adapters/web-socket-adapter.ts	2	0%

Totals
Change from base Build 3333350338:	-1.3%
Covered Lines:	465
Relevant Lines:	693

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💛 - Coveralls