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UnitControl: rewrite tests in TypeScript #40697

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merged 15 commits into from
May 3, 2022

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ciampo
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@ciampo ciampo commented Apr 28, 2022

What?

Rewrite UnitControl's unit tests to TypeScript, and add a few related tweaks/fixes that were highlighted by the refactor.

Why?

See #35744 for more context.

How?

  • Rewrote unit tests to TypeScript
  • Tweaked a few types for the internal utility functions (including adding a typeguard)
  • Rewrote some tests using testing library's utilities (e.g. toBeInTheDocument, getByRole...)
  • Switched to snapshot diffs for checking if classname gets applied properly

TODO: maybe add another bug fix changelog entry (see comment below)

Testing Instructions

  • Unit tests pass
  • Component behaves as expected in Storybook

@ciampo ciampo added [Type] Bug An existing feature does not function as intended [Type] Enhancement A suggestion for improvement. [Type] Automated Testing Testing infrastructure changes impacting the execution of end-to-end (E2E) and/or unit tests. [Package] Components /packages/components [Feature] Component System WordPress component system labels Apr 28, 2022
@ciampo ciampo requested a review from ajitbohra as a code owner April 28, 2022 17:53
@ciampo ciampo self-assigned this Apr 28, 2022
Comment on lines 138 to 139
// The unit is not being displayed!
const label = screen.getByText( '%' );
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@ciampo ciampo Apr 28, 2022

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Currently this line is failing in unit tests — that's because we switched from just checking that an element with class components-unit-control__unit-label exists, to actually looking for the unit label being displayed (testing-library FTW!)

I'm not sure if we should call this a bug, though. Technically we're not passing any value to UnitControl, and therefore the component internally has not value to parse a unit from. If we passed value="30%", then this test would pass.

If our expectations are that UnitControl would display the % unit, for how the component is coded right now, it would mean that effectively the selected unit is % (which would also be reflected in the new components's value and probably fired through the change callbacks). Would that be a correct behavior to expect? I'm personally not so sure.

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From how I'd interpret it, the purpose of this test is exactly what it says: "should render label if single units". The fact that it's rendered with no value defined is just an oversight, and I think the original PR confirms that (#33634).

I think we should just render it with value="30%" like you suggest.

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I think we should just render it with value="30%" like you suggest.

I went ahead and did this in 8929d0b (which should fix the tests for now).

I still decided to look into this a bit more, and therefore I decided to add a couple of Storybook examples for this scenario:

  • One closely representing the failing unit test (e.g. uncontrolled UnitControl with just one unit)
  • Another one where UnitControl is controlled, but its starting value is undefined (still with just one unit)

In the controlled case, the unit is not visible when value is set to undefined (its starting value). The unit then becomes visible when a number is entered, and stays visible even if those numbers are deleted (likely because the value becomes an empty string rather than undefined):

unit-control-single-unit-controlled.mp4

In the uncontrolled case, the unit is never shown even after the user enters a value:

unit-control-single-unit-uncontrolled.mp4

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Huh, good investigation! I would expect that when there is only one unit, the unit would be visible at mount and stay visible no matter what. This kind of seems like a common use case so I'd say it's worth fixing if it isn't too hard. What do you think?

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Really appreciate the meticulous work here 🙂

packages/components/src/unit-control/test/utils.ts Outdated Show resolved Hide resolved
Comment on lines 138 to 139
// The unit is not being displayed!
const label = screen.getByText( '%' );
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From how I'd interpret it, the purpose of this test is exactly what it says: "should render label if single units". The fact that it's rendered with no value defined is just an oversight, and I think the original PR confirms that (#33634).

I think we should just render it with value="30%" like you suggest.

@ciampo ciampo requested a review from mirka April 29, 2022 14:49
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Aside from the possible bug you uncovered, I think this PR itself is good to go 👍

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ciampo commented May 2, 2022

I wonder if this bug would be fixed by the changes in #40518 and #40568

Since this PR doesn't introduce any new features / fixes, I'm going to hold and merge it only after #40518 and #40568 are merged. This will also avoid introducing conflicts in those PRs (which are already quite complex and introduce changes to the same unit tests that this PR touches).

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This all looks good to me.

I wonder if this bug would be fixed by the changes in #40518 and #40568

I looked into this and it seems the single unit UnitLabel is rendered it just doesn't have content.

A one-liner can fix it. Maybe I'll put it in a PR.
diff --git a/packages/components/src/unit-control/index.tsx b/packages/components/src/unit-control/index.tsx
index 089155b9d2..00810c45ef 100644
--- a/packages/components/src/unit-control/index.tsx
+++ b/packages/components/src/unit-control/index.tsx
@@ -88,7 +88,7 @@ function UnforwardedUnitControl(
 	);
 
 	const [ unit, setUnit ] = useControlledState< string | undefined >(
-		unitProp,
+		units.length === 1 ? units[ 0 ].label : unitProp,
 		{
 			initial: parsedUnit,
 			fallback: '',

I'm going to hold and merge it only after #40518 and #40568 are merged. This will also avoid introducing conflicts in those PRs

I think it's fine if you want to go ahead and an merge this as any conflict would be trivial to resolve. Actually, if you were to add any missing await’s #40568 (comment) here, I think any conflict would auto-resolve.

@ciampo ciampo merged commit 1326a46 into trunk May 3, 2022
@ciampo ciampo deleted the feat/components-unit-control-tests-typescript branch May 3, 2022 10:13
@github-actions github-actions bot added this to the Gutenberg 13.2 milestone May 3, 2022
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ciampo commented May 3, 2022

Thank you for the help in coordinating around these changes!

I went ahead and merged this PR as-is. I'm going to open 2 follow-ups:

(will update this message with links to those PRs once opened)

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[Feature] Component System WordPress component system [Package] Components /packages/components [Type] Automated Testing Testing infrastructure changes impacting the execution of end-to-end (E2E) and/or unit tests. [Type] Bug An existing feature does not function as intended
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4 participants