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Add test coverage for readContext() on the server #14649

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Merged
merged 2 commits into from
Jan 21, 2019
Merged

Add test coverage for readContext() on the server #14649

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aead63e
Rename context variables
gaearon Jan 21, 2019
c85e21b
Add test coverage for readContext() on the server
gaearon Jan 21, 2019
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71 changes: 57 additions & 14 deletions packages/react-dom/src/__tests__/ReactDOMServerIntegrationNewContext-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -37,9 +37,9 @@ describe('ReactDOMServerIntegration', () => {
});

describe('context', function() {
let PurpleContext, RedContext, Consumer;
let Context, PurpleContextProvider, RedContextProvider, Consumer;
beforeEach(() => {
let Context = React.createContext('none');
Context = React.createContext('none');

class Parent extends React.Component {
render() {
Expand All @@ -51,8 +51,12 @@ describe('ReactDOMServerIntegration', () => {
}
}
Consumer = Context.Consumer;
PurpleContext = props => <Parent text="purple">{props.children}</Parent>;
RedContext = props => <Parent text="red">{props.children}</Parent>;
PurpleContextProvider = props => (
<Parent text="purple">{props.children}</Parent>
);
RedContextProvider = props => (
<Parent text="red">{props.children}</Parent>
);
});

itRenders('class child with context', async render => {
Expand All @@ -67,9 +71,9 @@ describe('ReactDOMServerIntegration', () => {
}

const e = await render(
<PurpleContext>
<PurpleContextProvider>
<ClassChildWithContext />
</PurpleContext>,
</PurpleContextProvider>,
);
expect(e.textContent).toBe('purple');
});
Expand All @@ -80,9 +84,9 @@ describe('ReactDOMServerIntegration', () => {
}

const e = await render(
<PurpleContext>
<PurpleContextProvider>
<FunctionChildWithContext />
</PurpleContext>,
</PurpleContextProvider>,
);
expect(e.textContent).toBe('purple');
});
Expand Down Expand Up @@ -127,9 +131,9 @@ describe('ReactDOMServerIntegration', () => {
const Child = props => <Grandchild />;

const e = await render(
<PurpleContext>
<PurpleContextProvider>
<Child />
</PurpleContext>,
</PurpleContextProvider>,
);
expect(e.textContent).toBe('purple');
});
Expand All @@ -144,15 +148,54 @@ describe('ReactDOMServerIntegration', () => {
};

const e = await render(
<PurpleContext>
<RedContext>
<PurpleContextProvider>
<RedContextProvider>
<Grandchild />
</RedContext>
</PurpleContext>,
</RedContextProvider>
</PurpleContextProvider>,
);
expect(e.textContent).toBe('red');
});

itRenders('readContext() in different components', async render => {
function readContext(Ctx, observedBits) {
const dispatcher =
React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
.ReactCurrentDispatcher.current;
return dispatcher.readContext(Ctx, observedBits);
}

class Cls extends React.Component {
render() {
return readContext(Context);
}
}
function Fn() {
return readContext(Context);
}
const Memo = React.memo(() => {
return readContext(Context);
});
const FwdRef = React.forwardRef((props, ref) => {
return readContext(Context);
});

const e = await render(
<PurpleContextProvider>
<RedContextProvider>
<span>
<Fn />
<Cls />
<Memo />
<FwdRef />
<Consumer>{() => readContext(Context)}</Consumer>
</span>
</RedContextProvider>
</PurpleContextProvider>,
);
expect(e.textContent).toBe('redredredredred');
});

itRenders('multiple contexts', async render => {
const Theme = React.createContext('dark');
const Language = React.createContext('french');
Expand Down