Move copy button test from e2e to unit test

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

cypress/integration/highlightedCodeBlock.spec.ts

@@ -91,21 +91,4 @@ describe('Code', () => {
       })
     })
   })
-
-  it('has a working copy button', () => {
-    cy.setCodemirrorContent('```javascript \nlet x = 0\n```')
-
-    cy.getByCypressId('documentIframe').then((element: JQuery<HTMLElement>) => {
-      const frame = element.get(0) as HTMLIFrameElement
-      if (frame === null || frame.contentWindow === null) {
-        return cy.wrap(null)
-      }
-
-      cy.spy(frame.contentWindow.navigator.clipboard, 'writeText').as('copy')
-    })
-
-    cy.getIframeBody().findByCypressId('copy-code-button').click()
-
-    cy.get('@copy').should('be.calledWithExactly', 'let x = 0\n')
-  })
 })

src/components/common/copyable/copy-to-clipboard-button/__snapshots__/copy-to-clipboard-button.test.tsx.snap

@@ -0,0 +1,88 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Copy to clipboard button show an error text if clipboard api isn't available 1`] = `
+<div>
+  <button
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;
+
+exports[`Copy to clipboard button show an error text if clipboard api isn't available 2`] = `
+<div>
+  <button
+    aria-describedby="copied_35a35a31-c259-48c4-b75a-8da99859dcdb"
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;
+
+exports[`Copy to clipboard button shows an error text if writing failed 1`] = `
+<div>
+  <button
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;
+
+exports[`Copy to clipboard button shows an error text if writing failed 2`] = `
+<div>
+  <button
+    aria-describedby="copied_35a35a31-c259-48c4-b75a-8da99859dcdb"
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;
+
+exports[`Copy to clipboard button shows an success text if writing succeeded 1`] = `
+<div>
+  <button
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;
+
+exports[`Copy to clipboard button shows an success text if writing succeeded 2`] = `
+<div>
+  <button
+    aria-describedby="copied_35a35a31-c259-48c4-b75a-8da99859dcdb"
+    class="btn btn-dark btn-sm"
+    title="renderer.highlightCode.copyCode"
+    type="button"
+  >
+    <i
+      class="fa  fa-files-o  "
+    />
+  </button>
+</div>
+`;

src/components/common/copyable/copy-to-clipboard-button/copy-to-clipboard-button.test.tsx

@@ -0,0 +1,69 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { mockI18n } from '../../../markdown-renderer/test-utils/mock-i18n'
+import { CopyToClipboardButton } from './copy-to-clipboard-button'
+import { render, screen } from '@testing-library/react'
+import * as uuidModule from 'uuid'
+
+jest.mock('uuid')
+
+describe('Copy to clipboard button', () => {
+  const copyContent = 'Copy McCopy Content. Electric Copyloo'
+  const copyToClipboardButton = <CopyToClipboardButton content={copyContent} />
+  const uuidMock = '35a35a31-c259-48c4-b75a-8da99859dcdb' // https://xkcd.com/221/
+  const overlayId = `copied_${uuidMock}`
+
+  const mockClipboard = async (copyIsSuccessful: boolean, testFunction: () => Promise<void>) => {
+    const originalClipboard = window.navigator.clipboard
+    const writeTextMock = jest.fn().mockImplementation(() => (copyIsSuccessful ? Promise.resolve() : Promise.reject()))
+    Object.assign(global.navigator, {
+      clipboard: {
+        writeText: writeTextMock
+      }
+    })
+
+    try {
+      await testFunction()
+      expect(writeTextMock).toHaveBeenCalledWith(copyContent)
+    } finally {
+      Object.assign(global.navigator, {
+        clipboard: originalClipboard
+      })
+    }
+  }
+
+  const testButton = async (expectSuccess: boolean) => {
+    const view = render(copyToClipboardButton)
+    expect(view.container).toMatchSnapshot()
+    const button = await screen.findByTitle('renderer.highlightCode.copyCode')
+    button.click()
+    const tooltip = await screen.findByRole('tooltip')
+    expect(tooltip).toHaveTextContent(expectSuccess ? 'copyOverlay.success' : 'copyOverlay.error')
+    expect(tooltip).toHaveAttribute('id', overlayId)
+    expect(view.container).toMatchSnapshot()
+  }
+
+  beforeAll(async () => {
+    await mockI18n()
+    jest.spyOn(uuidModule, 'v4').mockReturnValue(uuidMock)
+  })
+
+  afterAll(() => {
+    jest.resetAllMocks()
+    jest.resetModules()
+  })
+
+  it('shows an success text if writing succeeded', () => mockClipboard(true, () => testButton(true)))
+  it('shows an error text if writing failed', () => mockClipboard(false, () => testButton(false)))
+  it("show an error text if clipboard api isn't available", () => testButton(false))
+})

src/components/common/copyable/hooks/use-copy-overlay.tsx

@@ -5,16 +5,23 @@
  */
 
 import type { ReactElement, RefObject } from 'react'
-import React, { useCallback, useMemo, useState } from 'react'
+import React, { useCallback, useEffect, useMemo, useState } from 'react'
 import { Overlay, Tooltip } from 'react-bootstrap'
 import { Trans, useTranslation } from 'react-i18next'
 import { v4 as uuid } from 'uuid'
 import { ShowIf } from '../../show-if/show-if'
 import { Logger } from '../../../../utils/logger'
 import { isClientSideRendering } from '../../../../utils/is-client-side-rendering'
+import { useTimeoutFn } from 'react-use'
 
 const log = new Logger('useCopyOverlay')
 
+enum SHOW_STATE {
+  SUCCESS,
+  ERROR,
+  HIDDEN
+}
+
 /**
  * Provides a function that writes the given text into the browser clipboard and an {@link Overlay overlay} that is shown when the copy action was successful.
  *
@@ -27,48 +34,54 @@ export const useCopyOverlay = (
   content: string
 ): [copyToCliphoard: () => void, overlayElement: ReactElement] => {
   useTranslation()
-  const [showCopiedTooltip, setShowCopiedTooltip] = useState(false)
-  const [error, setError] = useState(false)
+  const [showState, setShowState] = useState<SHOW_STATE>(SHOW_STATE.HIDDEN)
   const [tooltipId] = useState<string>(() => uuid())
 
+  const [, , reset] = useTimeoutFn(() => setShowState(SHOW_STATE.HIDDEN), 2000)
+
+  useEffect(() => {
+    if (showState !== SHOW_STATE.HIDDEN) {
+      reset()
+    }
+  }, [reset, showState])
+
   const copyToClipboard = useCallback(() => {
     if (!isClientSideRendering()) {
+      setShowState(SHOW_STATE.ERROR)
       log.error('Clipboard not available in server side rendering')
       return
     }
+    if (typeof navigator.clipboard === 'undefined') {
+      setShowState(SHOW_STATE.ERROR)
+      return
+    }
     navigator.clipboard
       .writeText(content)
       .then(() => {
-        setError(false)
+        setShowState(SHOW_STATE.SUCCESS)
       })
       .catch((error: Error) => {
-        setError(true)
+        setShowState(SHOW_STATE.ERROR)
         log.error('Copy failed', error)
       })
-      .finally(() => {
-        setShowCopiedTooltip(true)
-        setTimeout(() => {
-          setShowCopiedTooltip(false)
-        }, 2000)
-      })
   }, [content])
 
   const overlayElement = useMemo(
     () => (
-      <Overlay target={clickComponent} show={showCopiedTooltip} placement='top'>
+      <Overlay target={clickComponent} show={showState !== SHOW_STATE.HIDDEN} placement='top'>
         {(props) => (
           <Tooltip id={`copied_${tooltipId}`} {...props}>
-            <ShowIf condition={error}>
+            <ShowIf condition={showState === SHOW_STATE.ERROR}>
               <Trans i18nKey={'copyOverlay.error'} />
             </ShowIf>
-            <ShowIf condition={!error}>
+            <ShowIf condition={showState === SHOW_STATE.SUCCESS}>
               <Trans i18nKey={'copyOverlay.success'} />
             </ShowIf>
           </Tooltip>
         )}
       </Overlay>
     ),
-    [clickComponent, error, showCopiedTooltip, tooltipId]
+    [clickComponent, showState, tooltipId]
   )
 
   return [copyToClipboard, overlayElement]