Cannot read property of null enzyme

GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Similar problem as Ran into this issue and did some debugging myself.

Enzyme relies on the instance. This did not work for me on react-native version 0. Updating to react Sounds like we need to up the peer dep on the react 16 adapter to a later version; michaelgmcddo you know which exact react 16 version added that property? I've only briefly looked into this, but it looks like this commit made the change and it was released in react Is anyone else getting this error when trying to launch Enzyme setupTests.

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Uncaught TypeError: Cannot read property of null

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Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels bug package: react adapter: Copy link Quote reply. Keksike changed the title TypeError: Cannot read property 'rendered' of null Enzyme mount : TypeError: Cannot read property 'rendered' of null Oct 3, GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. While using React Yet, I'm not using React Just FYI to anyone reading. Using npm ls it's possible to see peerDependencies and identify the issue easly. We use optional third-party analytics cookies to understand how you use GitHub. Learn more. You can always update your selection by clicking Cookie Preferences at the bottom of the page.

For more information, see our Privacy Statement. We use essential cookies to perform essential website functions, e. We use analytics cookies to understand how you use our websites so we can make them better, e. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Sign up. New issue. Jump to bottom.There are a few variations of this error depending on the property you are trying to access. Sometimes instead of null it will say undefined. An example will be:. All this means is that you are trying to access a property of an object that is undefined. These usually happens when we don't test an object before using it.

Here is a common scenario. This will result in Uncaught TypeError: Cannot read property 'value' of null. The reason will be that the element with id input does not exist. Let me break it down in simpler steps.

When you break it down, the error actually makes sense. To make sure that you don't get this error, you have to make sure that btnor any object you use, is not null before you use it. For our example:. Sometimes, your object is nested deeper like Tree. You just have to make sure that if you need to access folderthan Tree has to be defined. And if you need to access paththen folder needs to be defined. In some cases, this error is a symptom of another issue.

Why would getElementById return null if the element actually exists on the page? Probably because the function is called before the DOM is ready. Always be careful when accessing a DOM element before it is ready. Did you like this article? You can subscribe to read more awesome ones. Denisander Vivan Jun 28 :. Ibrahim Jun 28 :. You also have an error here resp.

The correct way is with a lowercase i. Like this: resp. Ibrahim Jul 11 :. The problem is that you haven't debugged your code. You can never find an answer like this. Instead, ask yourself these questions:.

Shahnila Fahmi Aug 1 :. Ibrahima Diallo Sep 12 :. The issue is you are running your script before the page is done downloading. So when you call document. You have to wait for the DOM Document object model to be ready before you can access it.

Uncought Type Error: Cannot set property 'innerHTML' of null

Since you have jQuery on the page, you can do that by wrapping your code in a Jquery Function. Renan Oct 7 :.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. This can be reproduced when trying to the use the shallow rendering filterWhere API method. Please see the below code snippet:. In my test I want to check if the value of a specific prop is for e. Are there any workarounds for this issue? Event tried to to do:. Another example:. Any progress on this guys?

I have the same problem, but with n. See the stack trace below:. Test case from comment still fail. We use optional third-party analytics cookies to understand how you use GitHub. Learn more. You can always update your selection by clicking Cookie Preferences at the bottom of the page. For more information, see our Privacy Statement. We use essential cookies to perform essential website functions, e. We use analytics cookies to understand how you use our websites so we can make them better, e.When using Enzyme and React-Intl you are likely run into the issues when testing components that use some of React-Intl's components or injected formatting functions.

These helper functions mountWithIntl and shallowWithIntl aim to address some of the below errors:. Injecting react-intl object into mounted Enzyme components for testing.

Is this simply because we're tying to extend Enzyme into integration tests, when it is designed for unit tests? You can only get the state of the mounted component in your case AppLayout because that instance is mapped to the ReactWrapper.

The children will be instantiated, but their instances won't be mapped as far as I know. I've experimented with this a lot. Hence you want to mount your testable component directly and "inject" or "wrap around" the intl context.

The helper function will do this. It's unable to do the translation lookup, so it resorts to the default message. For your helpers to work, does this require the use of injectIntl in the actual component to be able to look up translations within en.

Wondering if I'm missing something with injection. How is your app component configured? The messages we simply require and pass on, exactly like you're doing. For our tests we're doing something similar as you can see on enzyme-test-helper line Make sure the require path is correct and it should be up and running.

How did you resolve this issue? SamAmiri - what's happening is that you are importing the functions underneath a mountWithIntl object. Rather than doing:.

Ok, i've figured out why, i was testing for redux with a Provider Wrapperso the nodeWithIntlProp needed to simulate the injectIntl wasn't setting the prop intl to my component, but to the wrapper. The shallowWithIntl is pretty pointless with this approach however, since it only shallowly mounts the injectIntl wrapper. Is there any way to avoid all of this? I am having similar problems. Basically this leads me to getting the Invariant Violation: [React Intl] Could not find required intl object.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

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Already on GitHub? Sign in to your account. Describe the bug Seeing an issue after upgrading to Enzyme 3.

Jest, Enzyme, Cannot read property 'map' of undefined

The errors seem to all relate to new the fibre addition and tags and one example is below:. Rolling back the version of the enzyme-adapter-react to 1. How are you using jsdom, and which version? Note that react and react-dom must always match minor versions. Line is. I'd do delete ReactDOM. Useful guidance that points me to the right direction. I ran into this same error. It turns out that in out jest. For those of you who have this error because you're mocking createPortalI found a workaround if you still need to mock it.

You assign the original createPortal implementation to a variable, mock the implementation and run your test, then reassign it to the original implementation after the test. Only downside is you would have to do this for every test where you need it. We use optional third-party analytics cookies to understand how you use GitHub.

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New issue. Jump to bottom. Copy link Quote reply. Thanks, this is a great bug to catch. Jest snapshot testing in my case. Can you use enzyme's. Caraws mentioned this issue Oct 26, I found the same issue and changed the version to fix.

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Within my React Class component I have created a react ref which I use to ensure that when the component is mounted the browser is at the top of the page.

I have tried both shallow and mount methods and whilst the element found is not null, it appears to be a react instance of HTMLDivElement which is missing the scrollIntoView method. Of particular note for this question is that it does not implement scrollIntoView since jsdom does not do layout and would therefore not be able to provide an accurate implementation.

Because jsdom does not implement scrollIntoView it will be undefined on elements provided by jsdom. The recommended approach from this Google dev is to add the following line to your test code:. That line will add a noop implementation of scrollIntoView to the jsdom -provided Element.

For your test you could take it a step further and set scrollIntoView to a spy to make sure it is called:. Learn more. TypeError: Cannot read property 'scrollIntoView' of null - react.

Asked 2 years ago. Active 2 years ago. Viewed 12k times. Using react My test is simple, it just tries to render the component. Thiago Murakami 4 4 silver badges 10 10 bronze badges. Joel Joel 2 2 gold badges 7 7 silver badges 15 15 bronze badges. Active Oldest Votes. Issue jsdom implements much of the browser environment but it does not implement everything. Solution The recommended approach from this Google dev is to add the following line to your test code: Element.

Brian Adams Brian Adams I see this fix everywhere, but were are you importing Element from? I get 'Element is not defined' I am using enzyme with chai.

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The default test environment for Jest is a browser-like environment provided by jsdomwhich provides the Element class in the global scope like the browser does. I am using enzyme but not jest, so that will be why the global is not there. In the end extracted the functionality to a 'service' that is passed to the component so it can be mocked. Not ideal but stopped the errors. Cheers guys! The error you get is because ReactDOM. You should not use React.

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