Viewing github.com/facebook/react/packages/react-reconciler/src/__tests__/ReactFiberHostContext-test.internal.js

```
/**
```

 * Copyright (c) Meta Platforms, Inc. and affiliates.

```
 *
```

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

```
 *
```
```
 * @emails react-core
```
```
 * @jest-environment node
```
```
 */
```
```
'use strict';
```
```
let React;
```
```
let act;
```
```
let ReactFiberReconciler;
```
```
let ConcurrentRoot;
```
```
let DefaultEventPriority;
```

describe('ReactFiberHostContext', () => {

```
  beforeEach(() => {
```
```
    jest.resetModules();
```
```
    React = require('react');
```
```
    act = React.unstable_act;
```

    ReactFiberReconciler = require('react-reconciler');

```
    ConcurrentRoot =
```

      require('react-reconciler/src/ReactRootTags').ConcurrentRoot;

```
    DefaultEventPriority =
```

      require('react-reconciler/src/ReactEventPriorities').DefaultEventPriority;

```
  });
```

  global.IS_REACT_ACT_ENVIRONMENT = true;

```
  // @gate __DEV__
```

  it('should send the context to prepareForCommit and resetAfterCommit', () => {

```
    const rootContext = {};
```
```
    const childContext = {};
```

    const Renderer = ReactFiberReconciler({

      prepareForCommit: function (hostContext) {

        expect(hostContext).toBe(rootContext);

```
        return null;
```
```
      },
```

      resetAfterCommit: function (hostContext) {

        expect(hostContext).toBe(rootContext);

```
      },
```

      getRootHostContext: function () {

```
        return rootContext;
```
```
      },
```

      getChildHostContext: function () {

```
        return childContext;
```
```
      },
```

      shouldSetTextContent: function () {

```
        return false;
```
```
      },
```
```
      createInstance: function () {
```
```
        return null;
```
```
      },
```

      finalizeInitialChildren: function () {

```
        return null;
```
```
      },
```

      appendInitialChild: function () {

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        return null;
```
```
      },
```
```
      now: function () {
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        return 0;
```
```
      },
```

      appendChildToContainer: function () {

```
        return null;
```
```
      },
```
```
      clearContainer: function () {},
```

      getCurrentEventPriority: function () {

```
        return DefaultEventPriority;
```
```
      },
```
```
      shouldAttemptEagerTransition() {
```
```
        return false;
```
```
      },
```

      requestPostPaintCallback: function () {},

```
      maySuspendCommit(type, props) {
```
```
        return false;
```
```
      },
```
```
      preloadInstance(type, props) {
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```
        return true;
```
```
      },
```
```
      startSuspendingCommit() {},
```
```
      suspendInstance(type, props) {},
```
```
      waitForCommitToBeReady() {
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```
        return null;
```
```
      },
```
```
      supportsMutation: true,
```
```
    });
```

    const container = Renderer.createContainer(

```
      rootContext,
```
```
      ConcurrentRoot,
```
```
      null,
```
```
      false,
```
```
      '',
```
```
      null,
```
```
    );
```
```
    act(() => {
```
```
      Renderer.updateContainer(
```
```
        <a>
```
```
          <b />
```
```
        </a>,
```
```
        container,
```
```
        /* parentComponent: */ null,
```
```
        /* callback: */ null,
```
```
      );
```
```
    });
```
```
  });
```
```
});
```

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