E2E test failures with older WP versions

[ockham]

In #404, I tentatively (and temporarily) enabled e2e tests for all WP versions starting with 6.2, which is the minimum version required per the plugin header:

secure-custom-fields/secure-custom-fields.php

Line 15 in 183d93e

* Requires at least: 6.2

I expected Command Palette tests to fail with 6.2, since the Command Palette was only introduced in 6.3. (I'm addressing that in #404.)

However, Command Palette tests also failed in 6.3, alongside a lot of Field Type tests (tests/e2e/field-type-*.spec.ts).
One error I've seen in the browser console is

Uncaught TypeError: Cannot read properties of undefined (reading 'jsx')

which is due to a missing ReactJSXRuntime dependency. The latter was introduced in WP 6.6; we'll likely need to polyfill it in order to support earlier versions.

(Alternatively, we could bump the minimum required version to WP 6.6.)

Other test failures:

• 6.3, 6.4, 6.5:
  • tests/e2e/block-testimonial.spec.ts:31:2 › SCF Block > Testimonial › should use testimonial block with fields
  • tests/e2e/block-v3-features.spec.ts:161:2 › SCF Block V3 Features › should validate required fields on publish
  • tests/e2e/command-palette.spec.ts: Multiple errors
• 6.5, 6.6:
  • tests/e2e/block-testimonial.spec.ts:31:2 › SCF Block > Testimonial › should use testimonial block with fields
  • tests/e2e/block-v3-features.spec.ts:36:2 › SCF Block V3 Features
    • should render v3 block in preview-only mode
    • should update preview when sidebar fields change
    • should save v3 block data correctly
• 6.5, 6.6, 6.7.:
  • tests/e2e/block-bindings-site-editor.spec.ts:24:2 › Block Bindings in Site Editor › should bind text field to paragraph block in site editor

and more in 6.3 and 6.4.