Yicong-Huang opened a new issue, #5188:
URL: https://github.com/apache/texera/issues/5188
### Task Summary
Several frontend component specs replace the parent component's template at
test time — either with `overrideComponent({ set: { template: "" } })`, with a
stripped stub markup string, or with the broader `overrideComponent({ set: {
imports: [], schemas: [CUSTOM_ELEMENTS_SCHEMA] } })` form. The intent in each
case is to keep heavy child components or directives out of the test build, but
the side effect is that `fixture.detectChanges()` renders an empty or stub DOM,
the real `.component.html` never executes, and v8 coverage records 0% for it —
even though the specs themselves report green.
A handful of specs also carry `schemas: [NO_ERRORS_SCHEMA]`, which Angular's
own docs warn against because it hides real template typos and missing
bindings. For Angular 19 standalone components the schema is usually
unnecessary anyway: the parent's `imports:` array pulls the child graph in
transitively, so unknown-element errors no longer fire.
Refactor the affected specs to render the real template, document the right
approach in `frontend/TESTING.md`, and add ESLint rules so the patterns can't
grow back.
### Task Type
- [x] Testing / QA
- [x] Documentation
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