如何解决无法使用 react-native-testing-library 找到命名元素
我正在尝试通过占位符文本获取元素,但 react-native-testing-library 不断向我抛出相同的错误:
expect(received).toEqual(expected) // deep equality
Expected: "Cirurgião"
Received: {"_fiber": {"_debugHookTypes": null,"_debugID": 451,"_debugIsCurrentlyTiming":
false,"_debugNeedsRemount": false,"_debugOwner": [FiberNode],"_debugSource": [Object],"actualDuration": 0,"actualStartTime": -1,"alternate": null,"child": [FiberNode],"childExpirationTime": 0,"dependencies": null,"effectTag": 129,"elementType": [Function
Component],"expirationTime": 0,"firstEffect": null,"index": 0,"key": null,"lastEffect":
null,"memoizedProps": [Object],"memoizedState": null,"mode": 0,"nextEffect": null,"pendingProps": [Object],"ref": [Function ref],"return": [FiberNode],"selfBaseDuration": 0,"sibling": null,"stateNode": [Component],"tag": 1,"treeBaseDuration": 0,"type": [Function
Component],"updateQueue": null}}
这是我要测试的代码:
const { getByTestId,queryByTestId,getByPlaceholderText} = render(
<Input placeholder="Cirurgião"
testID='input_buscaCirurgiao_index'
value={mockValue}
autoCorrect={false}
keyboardType={(Platform.OS === 'android') ? 'visible-password' : 'default'}
onChangeText={mockState}
onSubmitEditing={mockState}
autoCapitalize='none' />
);
expect(getByPlaceholderText('Cirurgião')).toEqual('Cirurgião');
我还尝试通过 getByTestId 和 queryByTestId 获取我要测试的元素,但两者都出现了类似的错误。
如果我尝试使用 waitFor() => 进行测试,我不会收到任何错误消息,即使我尝试更改预期的输出,如 expect(getByTestId('test1').toEqual('test2');.
它运行顺利,但不应该。
我不确定我做错了什么。
解决方法
getByPlaceholderText
返回 first matching node。事实上,它成功地做到了这一点。节点表示为一个对象,你的测试说
Expected: "Cirurgião"
Received: {"_fiber": { //<- Here you actually received an object representing the node
发生这种情况是因为您希望对象节点等于一个字符串(字符串 != 节点):
.toEqual('Cirurgião');
您可能想要测试两种可能的情况:
- 组件是否真的存在/正在渲染?
- 视图是否包含我期望的占位符?
要测试第一个,您只需执行以下操作:
getByPlaceholderText('Cirurgião')
如果渲染树中没有组件,它将抛出异常,因此您的测试将失败。
测试第二个将是:
const input = getByPlaceholderText('Cirurgião');
expect(input.props.placeholder).toBe('Cirurgião');
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