/
test.ts
200 lines (178 loc) · 5.34 KB
/
test.ts
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import * as h from 'react-hyperscript';
import * as Enzyme from 'enzyme';
import * as Adapter from 'enzyme-adapter-react-16';
import { FetchLoader, makeCancelable } from './index';
const mount = Enzyme.mount;
// const shallow = Enzyme.shallow;
Enzyme.configure({ adapter: new Adapter() });
describe('FetchLoader', () => {
describe('when mounting the component and waiting for promise to fulfil', () => {
describe('when the promise succeeds', () => {
it('should render the text', (done) => {
const tree = mount(
h(FetchLoader, {
component: ({ data }: any) => h('div', data),
fetch: () => makeCancelable(Promise.resolve('some data')),
}),
);
setTimeout(() => {
expect(tree.text()).toEqual('some data');
expect(tree.state()).toEqual({
data: 'some data',
error: undefined,
isLoading: false,
extra: undefined,
shouldFetch: false,
});
done();
}, 0);
});
it('should use mapStateToProps', () => {
const tree = mount(
h(FetchLoader, {
component: ({ someData }: any) => h('div', someData),
fetch: () => makeCancelable(Promise.resolve('some data')),
mapStateToProps: (d) => ({ someData: d }),
}),
);
return new Promise((resolve) => {
setTimeout(() => {
try {
expect(tree.text()).toEqual('some data');
} finally {
resolve();
}
}, 0);
});
});
/* it('should use mapRefetchToProps', () => {
expect.assertions(1);
const tree = mount(h(FetchLoader, {
component: ({ onClick }: any) => h('div', { onClick }, 'click me'),
fetch: () => makeCancelable(Promise.resolve('some data')),
mapRefetchToProps: (onClick) => ({ onClick }),
}));
return new Promise((resolve, reject) => {
setTimeout(() => {
try {
tree.simulate('click');
expect(tree.state()).toEqual({
data: undefined,
error: undefined,
isLoading: true,
});
} catch (err) {
reject(err);
} finally {
resolve();
}
}, 0);
});
}); */
});
describe('when the promise fails', () => {
it('should return error data', (done) => {
const tree = mount(
h(FetchLoader, {
component: ({ data, error }: any) => {
if (error) return h('div', error);
return h('div', data);
},
fetch: () => makeCancelable(Promise.reject('some error')),
}),
);
setTimeout(() => {
expect(tree.text()).toEqual('some error');
expect(tree.state()).toEqual({
data: undefined,
error: 'some error',
isLoading: false,
extra: undefined,
shouldFetch: false,
});
done();
}, 0);
});
});
});
describe('when component is mounted', () => {
describe('when loader component was not passed', () => {});
describe('when loader prop is passed', () => {
it('should render loading text', () => {
const tree = mount(
h(FetchLoader, {
component: ({ data }: any) => h('div', data),
fetch: () => makeCancelable(Promise.resolve('some data')),
loader: () => h('div', 'loading'),
}),
);
expect(tree.text()).toEqual('loading');
expect(tree.state()).toEqual({
data: undefined,
error: undefined,
isLoading: true,
extra: undefined,
shouldFetch: true,
});
});
});
});
describe('when component is rendered multiple times', () => {
it('should cache the results of the async function', (done) => {
const fn = jest.fn();
const tree = mount(
h(FetchLoader, {
component: ({ data }: any) => h('div', data),
fetch: () =>
makeCancelable(
new Promise((resolve) => {
fn();
resolve();
}),
),
}),
);
tree.update();
setTimeout(() => {
tree.update();
}, 0);
setTimeout(() => {
tree.update();
}, 100);
setTimeout(() => {
tree.update();
}, 200);
setTimeout(() => {
expect(fn.mock.calls.length).toBe(1);
done();
}, 300);
});
});
describe('when the component is unmounted', () => {
it('should not throw an error', (done) => {
const original = console.error;
const error = jest.fn();
console.error = error;
const tree = mount(
h(FetchLoader, {
component: ({ data }: any) => h('div', data),
fetch: () =>
makeCancelable(
new Promise((resolve) => {
setTimeout(() => {
resolve('done!');
}, 50);
}),
),
}),
);
tree.unmount();
setTimeout(() => {
expect(error.mock.calls.length).toBe(0);
(console.error as any).mockClear();
console.error = original;
done();
}, 100);
});
});
});