[ofalvai]

The “diff against binary” E2E test creates a full update and repeats the immediate-install test's assertions, so its name implies coverage it does not provide.

Remove the duplicate test and the unused isDiff plumbing, including the synthetic diff manifest and signing bypass. Binary diff behavior remains covered by unit tests; adding binary diff E2E coverage is outside this change's scope.

[Copilot]

🟢 Approval recommended

The test-harness cleanup has no active review issues.

No open issues 🎉

What changed in this PR

This PR cleans up the CodePush test harness by removing a misleading “diff against binary” E2E test that duplicates full-update coverage. It removes unused diff-specific plumbing without changing runtime update behavior.

Changes:

• Removes the duplicate E2E test while retaining the immediate-install test.
• Removes isDiff parameters from archive helpers and their declarations.
• Removes synthetic diff-manifest generation and the diff-specific signing bypass.

File	Description
test/​test.mts	Removes the duplicate test and unused diff arguments.
test/​codesign.mts	Removes the signing bypass and updates the archive call.
code-push-plugin-testing-framework/​typings/​code-push-plugin-testing-framework.d.ts	Aligns helper declarations with the simplified signatures.
code-push-plugin-testing-framework/​script/​testUtil.js	Removes the diff flag and synthetic manifest generation.
code-push-plugin-testing-framework/​script/​projectManager.js	Removes the unused parameter from the base archive method.

_{Review effort: Balanced}