Fix accessibility tests for examples without JS enhancements

The `render` helper assumed all examples of a component for which
a JavaScript component exist would have a `data-module` and as such
forced initialising a JavaScript component when no element with the appropriate
`data-module` was found on the page.

This behaviour is handy to spot if a component suddenly stops rendering `data-module`,
so we don't want to change the `render` function. For the File Upload,
we can decide whether the error is relevant in the test, based on whether the `javascript`
macro option is set.

packages/govuk-frontend/src/govuk/components/file-upload/accessibility.puppeteer.test.mjs

@@ -7,9 +7,37 @@ describe('/components/file-upload', () => {
       const examples = await getExamples('file-upload')
 
       for (const exampleName in examples) {
-        await render(page, 'file-upload', examples[exampleName])
+        // JavaScript enhancements being optional, some examples will not have
+        // any element with `data-module="govuk-file-upload"`. This causes an error
+        // as `render` assumes that if a component is exported by GOV.UK Frontend
+        // its rendered markup will have a `data-module` and tried to initialise
+        // the JavaScript component, even if no element with the right `data-module`
+        // is on the page.
+        //
+        // Because of this, we need to filter `ElementError` thrown by the JavaScript
+        // component to examples that actually run the JavaScript enhancements
+        try {
+          await render(page, 'file-upload', examples[exampleName])
+        } catch (e) {
+          const macroOptions = /** @type {MacroOptions} */ (
+            examples[exampleName].context
+          )
+
+          const exampleUsesJavaScript = macroOptions.javascript
+          const exampleLackedRoot = e.message.includes(
+            'govuk-file-upload: Root element'
+          )
+
+          if (!exampleLackedRoot || exampleUsesJavaScript) {
+            throw e
+          }
+        }
         await expect(axe(page)).resolves.toHaveNoViolations()
       }
     }, 120000)
   })
 })
+
+/**
+ * @typedef {import('@govuk-frontend/lib/components').MacroOptions} MacroOptions
+ */