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The GitHub Actions job "Required Checks" on texera.git/gh-readonly-queue/main/pr-6938-ee41d9a2a6d977ddc10b8cee0ef1f04da7b3ef31 has succeeded.
Run started by GitHub user xuang7 (triggered by xuang7).

Head commit for run:
e3ecfca1b8a36ae55b8ed5af4606f74da79fa602 / Ranjani Veena Belavadi <16...@users.noreply.github.com>
test(frontend): add unit tests for serializePortIdentity (#6938)

### What changes were proposed in this PR?
Adds `port-identity-serde.spec.ts` to cover `serializePortIdentity`, a
previously untested pure utility function in `common/util/` that
serializes a `PortIdentity` into the stable string key `id_internal`.

This format is one half of a cross-language contract: the backend
produces the identical string in
`PortIdentityKeySerializer.portIdToString` and reads it back by
splitting on `"_"` in `PortIdentityKeyDeserializer`. A format mismatch
on either side would cause the frontend's schema lookup to silently
return `undefined` rather than fail, so the exact output is worth
pinning.

Covers four groups of behavior:

- **Format**: exact key for external and internal ports, including the
`id: 0` falsy-number boundary and large and negative ids passing through
unvalidated. These mirror `PortIdentityKeySerializerSpec.scala`'s case
table exactly, so both ends of the contract are now pinned by matching
assertions.
- **Distinctness**: ports differing only by `id`, or only by `internal`,
cannot collide on the same key.
- **Stability**: equal inputs always serialize identically.
- **Real usage**: the key works for object lookup when generated
independently at write and read time, and remains splittable into
exactly two fields for the backend deserializer.

No production code was changed.


### Any related issues, documentation, discussions?
Closes #6631


### How was this PR tested?
Added 12 new unit tests in `port-identity-serde.spec.ts` covering all
behavior described in the issue. Ran locally via `ng test --include
src/app/common/util/port-identity-serde.spec.ts --watch=false`; all 12
pass. Full suite also green via `yarn test` (3817 passed, 2 skipped, 198
files).


### Was this PR authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Claude Opus 4.8)

Co-authored-by: Yicong Huang <17...@users.noreply.github.com>

Report URL: https://github.com/apache/texera/actions/runs/30327097145

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