[Test] Expand Unit Tests For Core Functionality And CLI Of Src/lib/main.js

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Context

The core module (src/lib/main.js) is a crucial component of our application, responsible for handling various tasks and CLI interactions. However, it currently lacks comprehensive unit tests for its core functionality and CLI flows. To prevent regressions and ensure the reliability of our application, we need to expand the unit tests for the following areas:

Testable Acceptance Criteria

1. createSQSEventFromDigest

The createSQSEventFromDigest function is responsible for creating an SQS event from a given digest object. To ensure its correctness, we need to test the following scenarios:

  • Given a sample digest object, calling createSQSEventFromDigest(digest) returns an object with a single record:
    • Records is an array of length 1.
    • Records[0].body is the JSON string of the provided digest.
    • eventSource, eventVersion, eventName, and eventTime fields exist with expected formats.

2. digestLambdaHandler

The digestLambdaHandler function is a crucial part of our application, responsible for handling SQS events and processing digests. To ensure its correctness, we need to test the following scenarios:

  • Success Path:
    • When passed a well-formed SQS event (an object matching the output of createSQSEventFromDigest), the returned object has:
      • batchItemFailures equal to an empty array.
      • handler equal to "src/lib/main.digestLambdaHandler".
    • Verify that console.log was called with:
      • A JSON log entry containing level: "info" and the digest payload.
  • Failure Path:
    • When passed an SQS event whose body is invalid JSON:
      • The returned batchItemFailures array has length ≥ 1.
      • Each failure entry has an itemIdentifier field (either the original messageId or a generated fallback matching /fallback-\d+-\w+/).
      • console.error is called with log entries containing level: "error" and details of the parsing failure.

3. Logging Utilities

The logging utilities are essential for our application, providing a way to log important events and errors. To ensure their correctness, we need to test the following scenarios:

  • logConfig:
    • Calling logConfig() logs exactly one JSON entry to console.log with:
      • level: "info"
      • A valid ISO timestamp string.
      • message: "Configuration loaded".
      • A config object matching the parsed environment variables.
  • logInfo:
    • With VERBOSE_MODE = false, calling logInfo("test message") logs a JSON entry to console.log containing level: "info" and message: "test message".
  • logError:
    • Calling logError("test error", new Error("fail")) logs a JSON entry to console.error containing:
      • level: "error".
      • message: "test".
      • error: "Error: fail".

4. CLI Flag Behavior

The CLI flag behavior is crucial for our application, providing a way to interact with the application through the command line. To ensure its correctness, we need to test the following scenarios:

  • --help:
    • Invoking main(["--help"]) logs usage instructions (--help, --digest, --version) to console.log.
    • Returns a resolved promise without error.
  • --version:
    • Invoking main(["--version"]) logs a JSON entry with version matching package.json and a valid ISO timestamp.
  • --digest:
    • Invoking main(["--digest"]) triggers digestLambdaHandler with a mock event:
      • Returns success and logs the digest process to console.log.

5. Test Coverage & Automation

To ensure that our tests are comprehensive and reliable, we need to follow these guidelines:

  • All new tests reside under tests/unit/main.test.js.
  • Ensure mocks for console.log, console.error, and any child processes are properly restored between tests.
  • Running npm test or npm run test:unit passes all tests and increases coverage for src/lib/main.js to at least 90%.

Verification Steps

To verify that our tests are correct and comprehensive, we need to follow these steps:

  1. Review the new describe blocks and it/test cases in tests/unit/main.test.js.
  2. Run npm test and confirm all tests pass.
  3. Check coverage report to ensure all branches and utilities are exercised.
  4. Inspect CI logs or local output for CLI flag behaviors and logging formats.

Documentation Update

To ensure that our documentation is up-to-date and accurate, we need to follow these guidelines:

  • Link to MISSION.md and CONTRIBUTING.md at the top of sandbox/README.md.
  • Under Usage, add examples for invoking --help, --version, and --digest, including sample output snippets.
  • Document exported API functions: createSQSEventFromDigest, digestLambdaHandler, logConfig, logInfo, and logError with brief descriptions and examples.

By following these guidelines and verification steps, we can ensure that our unit tests for the core functionality and CLI of src/lib/main.js are comprehensive, reliable, and accurate.

Frequently Asked Questions

Q: What is the purpose of expanding unit tests for the core functionality and CLI of src/lib/main.js?

A: The purpose of expanding unit tests is to ensure the reliability and accuracy of the core functionality and CLI of src/lib/main.js. This includes testing the creation of SQS events from digest objects, the handling of SQS events and processing of digests, logging utilities, and CLI flag behavior.

Q: What are the key areas that need to be tested?

A: The key areas that need to be tested include:

  • createSQSEventFromDigest: Creating an SQS event from a given digest object.
  • digestLambdaHandler: Handling SQS events and processing digests.
  • Logging Utilities: Logging important events and errors.
  • CLI Flag Behavior: Interacting with the application through the command line.

Q: What are the testable acceptance criteria for each area?

A: The testable acceptance criteria for each area include:

  • createSQSEventFromDigest:
    • Given a sample digest object, calling createSQSEventFromDigest(digest) returns an object with a single record.
    • Records is an array of length 1.
    • Records[0].body is the JSON string of the provided digest.
    • eventSource, eventVersion, eventName, and eventTime fields exist with expected formats.
  • digestLambdaHandler:
    • Success Path:
      • When passed a well-formed SQS event (an object matching the output of createSQSEventFromDigest), the returned object has:
        • batchItemFailures equal to an empty array.
        • handler equal to "src/lib/main.digestLambdaHandler".
      • Verify that console.log was called with:
        • A JSON log entry containing level: "info" and the digest payload.
    • Failure Path:
      • When passed an SQS event whose body is invalid JSON:
        • The returned batchItemFailures array has length ≥ 1.
        • Each failure entry has an itemIdentifier field (either the original messageId or a generated fallback matching /fallback-\d+-\w+/).
        • console.error is called with log entries containing level: "error" and details of the parsing failure.
  • Logging Utilities:
    • logConfig:
      • Calling logConfig() logs exactly one JSON entry to console.log with:
        • level: "info"
        • A valid ISO timestamp string.
        • message: "Configuration loaded".
        • A config object matching the parsed environment variables.
    • logInfo:
      • With VERBOSE_MODE = false, calling logInfo("test message") logs a JSON entry to console.log containing level: "info" and message: "test message".
    • logError:
      • Calling logError("test error", new Error("fail")) logs a JSON entry to console containing:
        • level: "error".
        • message: "test error".
        • error: "Error: fail".
  • CLI Flag Behavior:
    • --help:
      • Invoking main(["--help"]) logs usage instructions (--help, --digest, --version) to console.log.
      • Returns a resolved promise without error.
    • --version:
      • Invoking main(["--version"]) logs a JSON entry with version matching package.json and a valid ISO timestamp.
    • --digest:
      • Invoking main(["--digest"]) triggers digestLambdaHandler with a mock event:
        • Returns success and logs the digest process to console.log.

Q: What are the verification steps to ensure that the tests are correct and comprehensive?

A: The verification steps include:

  1. Review the new describe blocks and it/test cases in tests/unit/main.test.js.
  2. Run npm test and confirm all tests pass.
  3. Check coverage report to ensure all branches and utilities are exercised.
  4. Inspect CI logs or local output for CLI flag behaviors and logging formats.

Q: What are the documentation updates required to ensure that the documentation is up-to-date and accurate?

A: The documentation updates include:

  • Link to MISSION.md and CONTRIBUTING.md at the top of sandbox/README.md.
  • Under Usage, add examples for invoking --help, --version, and --digest, including sample output snippets.
  • Document exported API functions: createSQSEventFromDigest, digestLambdaHandler, logConfig, logInfo, and logError with brief descriptions and examples.

By following these guidelines and verification steps, we can ensure that our unit tests for the core functionality and CLI of src/lib/main.js are comprehensive, reliable, and accurate.