Unit Testing Edit components and Create components result to error

and thumbs up for your great work!

So I am trying to write some vitest unit test for an Edit component (and Create also) using the tutorial on your website. So having a resource, and an edit component as follows:

<Edit> <SimpleForm> ..... </SimpleForm> </Edit>

So, when I try to write a test as follows:

describe(......
     it('.....', () => { 
       render(
         <AdminContext dataProvider={...someDataProvider...}>
           <MyEditComponent />
         </AdminContext>
       )
      })
)......

I get the following error:

 TypeError: Cannot read properties of undefined (reading 'toLowerCase') 
❯ Object._apply_rules node_modules/inflection/lib/inflection.js:594:53
❯ Object.singularize node_modules/inflection/lib/inflection.js:692:24
❯ node_modules/ra-core/src/core/useGetResourceLabel.ts:46:44 
❯ useEditController node_modules/ra-core/src/controller/edit/useEditController.ts:113:15 
❯ EditBase node_modules/ra-core/src/controller/edit/EditBase.tsx:42:46 
❯ renderWithHooks node_modules/react-dom/cjs/react-dom.development.js:15486:18 
❯ mountIndeterminateComponent node_modules/react-dom/cjs/react-dom.development.js:20103:13 
❯ beginWork node_modules/react-dom/cjs/react-dom.development.js:21626:16 
❯ beginWork$1 node_modules/react-dom/cjs/react-dom.development.js:27465:14 
❯ performUnitOfWork node_modules/react-dom/cjs/react-dom.development.js:26599:12

Other information:

React-admin version: 4.16.0
React version: 18.2.0

Any ideas on this one?

Thanks in advance.

Solution

Thanks for sharing your solution.

Indeed this error is due to the fact that <Edit> needs to know what the current resource is. You can either declare a <Resource> component with your edit view (what you ended up doing), but you can also provide the resource manually, either via a <ResourceContextProvider> or via the resource prop.

The latter is what react-admin does in some of its stories (see an example):

export const InitialValue = () => (
    <AdminContext
        i18nProvider={i18nProvider}
        dataProvider={
            {
                getOne: () => Promise.resolve({ data: { id: 1, gender: 'F' } }),
            } as any
        }
    >
        <Edit resource="posts" id="1">
            <SimpleForm>
                <SelectInput
                    source="gender"
                    choices={[
                        { id: 'M', name: 'Male ' },
                        { id: 'F', name: 'Female' },
                    ]}
                />
                <FormInspector name="gender" />
            </SimpleForm>
        </Edit>
    </AdminContext>
);

This syntax has the advantage to be shorter, which is useful for unit testing.

Hope this helps.