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import { h, render, Component } from '../../src/preact';
/** @jsx h */
describe('context', () => {
let scratch;
before( () => {
scratch = document.createElement('div');
(document.body || document.documentElement).appendChild(scratch);
});
beforeEach( () => {
scratch.innerHTML = '';
});
after( () => {
scratch.parentNode.removeChild(scratch);
scratch = null;
});
it('should pass context to grandchildren', () => {
const CONTEXT = { a:'a' };
const PROPS = { b:'b' };
// let inner;
class Outer extends Component {
getChildContext() {
return CONTEXT;
}
render(props) {
return <div><Inner {...props} /></div>;
}
}
sinon.spy(Outer.prototype, 'getChildContext');
class Inner extends Component {
// constructor() {
// super();
// inner = this;
// }
shouldComponentUpdate() { return true; }
componentWillReceiveProps() {}
componentWillUpdate() {}
componentDidUpdate() {}
render(props, state, context) {
return <div>{ context && context.a }</div>;
}
}
sinon.spy(Inner.prototype, 'shouldComponentUpdate');
sinon.spy(Inner.prototype, 'componentWillReceiveProps');
sinon.spy(Inner.prototype, 'componentWillUpdate');
sinon.spy(Inner.prototype, 'componentDidUpdate');
sinon.spy(Inner.prototype, 'render');
render(<Outer />, scratch, scratch.lastChild);
expect(Outer.prototype.getChildContext).to.have.been.calledOnce;
// initial render does not invoke anything but render():
expect(Inner.prototype.render).to.have.been.calledWith({}, {}, CONTEXT);
CONTEXT.foo = 'bar';
render(<Outer {...PROPS} />, scratch, scratch.lastChild);
expect(Outer.prototype.getChildContext).to.have.been.calledTwice;
expect(Inner.prototype.shouldComponentUpdate).to.have.been.calledOnce.and.calledWith(PROPS, {}, CONTEXT);
expect(Inner.prototype.componentWillReceiveProps).to.have.been.calledWith(PROPS, CONTEXT);
expect(Inner.prototype.componentWillUpdate).to.have.been.calledWith(PROPS, {});
expect(Inner.prototype.componentDidUpdate).to.have.been.calledWith({}, {});
expect(Inner.prototype.render).to.have.been.calledWith(PROPS, {}, CONTEXT);
/* Future:
* Newly created context objects are *not* currently cloned.
* This test checks that they *are* cloned.
*/
// Inner.prototype.render.reset();
// CONTEXT.foo = 'baz';
// inner.forceUpdate();
// expect(Inner.prototype.render).to.have.been.calledWith(PROPS, {}, { a:'a', foo:'bar' });
});
it('should pass context to direct children', () => {
const CONTEXT = { a:'a' };
const PROPS = { b:'b' };
class Outer extends Component {
getChildContext() {
return CONTEXT;
}
render(props) {
return <Inner {...props} />;
}
}
sinon.spy(Outer.prototype, 'getChildContext');
class Inner extends Component {
shouldComponentUpdate() { return true; }
componentWillReceiveProps() {}
componentWillUpdate() {}
componentDidUpdate() {}
render(props, state, context) {
return <div>{ context && context.a }</div>;
}
}
sinon.spy(Inner.prototype, 'shouldComponentUpdate');
sinon.spy(Inner.prototype, 'componentWillReceiveProps');
sinon.spy(Inner.prototype, 'componentWillUpdate');
sinon.spy(Inner.prototype, 'componentDidUpdate');
sinon.spy(Inner.prototype, 'render');
render(<Outer />, scratch, scratch.lastChild);
expect(Outer.prototype.getChildContext).to.have.been.calledOnce;
// initial render does not invoke anything but render():
expect(Inner.prototype.render).to.have.been.calledWith({}, {}, CONTEXT);
CONTEXT.foo = 'bar';
render(<Outer {...PROPS} />, scratch, scratch.lastChild);
expect(Outer.prototype.getChildContext).to.have.been.calledTwice;
expect(Inner.prototype.shouldComponentUpdate).to.have.been.calledOnce.and.calledWith(PROPS, {}, CONTEXT);
expect(Inner.prototype.componentWillReceiveProps).to.have.been.calledWith(PROPS, CONTEXT);
expect(Inner.prototype.componentWillUpdate).to.have.been.calledWith(PROPS, {});
expect(Inner.prototype.componentDidUpdate).to.have.been.calledWith({}, {});
expect(Inner.prototype.render).to.have.been.calledWith(PROPS, {}, CONTEXT);
// make sure render() could make use of context.a
expect(Inner.prototype.render).to.have.returned(sinon.match({ children:['a'] }));
});
it('should preserve existing context properties when creating child contexts', () => {
let outerContext = { outer:true },
innerContext = { inner:true };
class Outer extends Component {
getChildContext() {
return { outerContext };
}
render() {
return <div><Inner /></div>;
}
}
class Inner extends Component {
getChildContext() {
return { innerContext };
}
render() {
return <InnerMost />;
}
}
class InnerMost extends Component {
render() {
return <strong>test</strong>;
}
}
sinon.spy(Inner.prototype, 'render');
sinon.spy(InnerMost.prototype, 'render');
render(<Outer />, scratch);
expect(Inner.prototype.render).to.have.been.calledWith({}, {}, { outerContext });
expect(InnerMost.prototype.render).to.have.been.calledWith({}, {}, { outerContext, innerContext });
});
});
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