René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Add specs to auto-scroll.hook","articleBody":"Here you have a working tests checking the scrollTop value when it calls `doAutoScroll`.\r\n\r\n```\r\nimport { textarea } from 'pods/trainer/components/new-text.styles';\r\nimport React from 'react';\r\nimport { renderHook } from '@testing-library/react-hooks';\r\nimport { useAutoScroll } from './auto-scroll.hook';\r\n\r\ndescribe('src/common/hooks/auto-scroll.hook specs', () =\u003e {\r\n  it('should return initial values when it renders the hook', () =\u003e {\r\n    // Arrange\r\n    const textArea = {\r\n      scrollHeight: 10,\r\n      scrollTop: undefined,\r\n    };\r\n\r\n    jest.spyOn(React, 'useRef').mockReturnValue({\r\n      current: textArea,\r\n    });\r\n\r\n    // Act\r\n    const { result } = renderHook(() =\u003e useAutoScroll());\r\n\r\n    // Assert\r\n    expect(result.current.isAutoScrollEnabled).toBeTruthy();\r\n    expect(result.current.textAreaRef.current).not.toBeNull();\r\n    expect(result.current.textAreaRef.current.scrollHeight).toEqual(10);\r\n    expect(result.current.textAreaRef.current.scrollTop).toBeUndefined();\r\n  });\r\n\r\n  it('should update scrollTop with height value when it call doAutoScroll', () =\u003e {\r\n    // Arrange\r\n    const textArea = {\r\n      scrollHeight: 10,\r\n      scrollTop: undefined,\r\n    };\r\n\r\n    jest.spyOn(React, 'useRef').mockReturnValue({\r\n      current: textArea,\r\n    });\r\n\r\n    // Act\r\n    const { result } = renderHook(() =\u003e useAutoScroll());\r\n\r\n    result.current.doAutoScroll();\r\n\r\n    // Assert\r\n    expect(result.current.textAreaRef.current.scrollTop).toEqual(10);\r\n  });\r\n});\r\n\r\n```\r\n\r\n- Pending specs:\r\n  - Disable auto scroll and check `isAutoScrollEnabled` value\r\n  - Disable auto scroll, calls `doAutoScroll` and check it doesn't update the `scrollTop` value.","author":{"url":"https://github.com/nasdan","@type":"Person","name":"nasdan"},"datePublished":"2021-02-20T09:28:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/142/code-paster/issues/142"}