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import {
setupScratch,
teardown,
serializeHtml
} from '../../../test/_util/helpers';
import { div, span } from '../../../test/_util/dom';
import React, { createElement, Children, render } from 'preact/compat';
describe('Children', () => {
/** @type {HTMLDivElement} */
let scratch;
beforeEach(() => {
scratch = setupScratch();
});
afterEach(() => {
teardown(scratch);
});
describe('.count', () => {
let count;
function Foo(props) {
count = Children.count(props.children);
return <div>{count}</div>;
}
it('should return 0 for no children', () => {
render(<Foo />, scratch);
expect(count).to.equal(0);
});
it('should return number of children', () => {
render(
<Foo>
<div />
foo
</Foo>,
scratch
);
expect(count).to.equal(2);
});
});
describe('.only', () => {
let actual;
function Foo(props) {
actual = Children.only(props.children);
return <div>{actual}</div>;
}
it('should only allow 1 child', () => {
render(<Foo>foo</Foo>, scratch);
expect(actual).to.equal('foo');
});
it('should throw if no children are passed', () => {
// eslint-disable-next-line prefer-arrow-callback
expect(function() {
render(<Foo />, scratch);
}).to.throw();
});
it('should throw if more children are passed', () => {
// eslint-disable-next-line prefer-arrow-callback
expect(function() {
render(
<Foo>
foo
<span />
</Foo>,
scratch
);
}).to.throw();
});
});
describe('.map', () => {
function Foo(props) {
let children = Children.map(props.children, child => (
<span>{child}</span>
));
return <div>{children}</div>;
}
it('should iterate over children', () => {
render(
<Foo>
foo<div>bar</div>
</Foo>,
scratch
);
let expected = div([span('foo'), span(div('bar'))]);
expect(serializeHtml(scratch)).to.equal(expected);
});
it('should work with no children', () => {
render(<Foo />, scratch);
expect(serializeHtml(scratch)).to.equal('<div></div>');
});
it('should work with children as zero number', () => {
const testNumber = 0;
render(<Foo>{testNumber}</Foo>, scratch);
expect(serializeHtml(scratch)).to.equal('<div><span>0</span></div>');
});
it('should flatten result', () => {
const ProblemChild = ({ children }) => {
return React.Children.map(children, child => {
return React.Children.map(child.props.children, x => x);
}).filter(React.isValidElement);
};
const App = () => {
return (
<ProblemChild>
<div>
<div>1</div>
<div>2</div>
</div>
</ProblemChild>
);
};
render(<App />, scratch);
expect(scratch.textContent).to.equal('12');
});
it('should call with indices', () => {
const assertion = [];
const ProblemChild = ({ children }) => {
return React.Children.map(children, (child, i) => {
assertion.push(i);
return React.Children.map(child.props.children, (x, j) => {
assertion.push(j);
return x;
});
}).filter(React.isValidElement);
};
const App = () => {
return (
<ProblemChild>
<div>
<div>1</div>
<div>2</div>
</div>
<div>
<div>3</div>
<div>4</div>
</div>
</ProblemChild>
);
};
render(<App />, scratch);
expect(scratch.textContent).to.equal('1234');
expect(assertion.length).to.equal(6);
});
});
describe('.forEach', () => {
function Foo(props) {
let children = [];
Children.forEach(props.children, child =>
children.push(<span>{child}</span>)
);
return <div>{children}</div>;
}
it('should iterate over children', () => {
render(
<Foo>
foo<div>bar</div>
</Foo>,
scratch
);
let expected = div([span('foo'), span(div('bar'))]);
expect(serializeHtml(scratch)).to.equal(expected);
});
});
});
|
