Refactor Mock and Test Setup

[ronilan]

Overview

This pull request refactors the S3 mocking setup (see: #540) simplifying implementation, separates the S3 tests from the build tests, introduces test apps using alternative bucket specification (see: #576) and production/staging hosts (see: #533) and enables easy switch between mock bucket and real bucket (given status of: #613).

This pull request comes "on top" of (i.e. includes changes from) #648, #649, #650.

Change

Code

• Refactored mock setup (e3c9772)
  • mock modules moved to lib/mock.
  • mock modules are self contained and have a signature similar to that of other modules in the package.
  • simplified http mock to remove no longer needed interface.
  • modified http mock to support path style bucket access.
  • set http mock to work with default npg-mock-bucket bucket.
• Refactored test setup (9085b88)
  • separated s3 tests from build tests.
  • refactored fetch test and proxy-bcrypt test to work with refactored mock setup.
• Refactored test apps and increased test coverage (4572c86)
  • set hosts of test apps to point to mock bucket.
  • added app1.1 - identical to app1 but using production and staging binary host option.
  • added app1.2 - identical to app1 but using explicit host, region, bucket options.
• Added service script to switch test apps bucket from mock to S3 and vis versa. Removed previous one (c2c54c5)

Testing

• "Out of the Box" (repo clone) tests will skip interaction with S3.
• Setting the environment variable node_pre_gyp_mock_s3 to true will run them against the mock (see: repo CI).
• To run against a real bucket:
  • unset environment variable node_pre_gyp_mock_s3.
  • set environment variables AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY.
  • run npm run bucket {name-of-your-us-east-1-bucket}
• To switch back to mock:
  • set environment variable node_pre_gyp_mock_s3 to true.
  • run npm run bucket
• Manually configuring regions other than us-east-1 also works but switch is more work.
• Results of running npm run coverage differ depending on what bucket is used (real s3 or mock).

Tests

• All tests pass in both real bucket and mock bucket setups (including node 18).