Add unit tests and enable comprehensive coverage

[czirker]

Summary

• Enable --all flag for nyc coverage to include all source files
• Add new unit tests for better code coverage
• Coverage improved from 23.16% to 25.75% lines (310 tests)

Changes

• Updated .nycrc.json with all: true and proper include patterns
• Added lib.aws-util.utest.ts - tests for aws-util module (20 tests)
• Added lib.DynamodbFetcher.utest.ts - tests for DynamoDB fetcher
• Added lib.parser-util.utest.ts - tests for parser utilities

Test plan

• All existing tests pass
• New tests pass
• Coverage report generates correctly with --all flag

---

Note

Improves coverage and validation of core utilities without changing runtime code.

• Updates .nycrc.json to include lib/**/*, wrappers/**/*.js, index.js and sets all: true for comprehensive coverage
• Adds test/lib.aws-util.utest.ts covering copy, error, and date.getDate
• Adds test/lib.DynamodbFetcher.utest.ts covering constructor behavior, keyToString, and join batching/deduplication paths
• Adds test/lib.parser-util.utest.ts covering enums, fieldParsers, parsers, createParser, and FastJsonPlus

^{Written by Cursor Bugbot for commit 10f3094. This will update automatically on new commits. Configure here.}

[ch-snyk-sa]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[cursor]

Missing TypeScript test file exclusion pattern

Low Severity

The exclude pattern only includes **/*.utest.js but not **/*.utest.ts. With all: true enabled and TypeScript extensions configured, nyc now processes .ts source files directly. If a .utest.ts file were created in the lib/ directory (matching the include pattern lib/**/*.ts), it wouldn't be excluded since **/*.utest.js only matches JavaScript test files. This could incorrectly inflate coverage metrics.