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test('is possible to fill in a form and verify error messages (with the help of jest-dom https://testing-library.com/docs/ecosystem-jest-dom)', async () => {
const component = await render(MaterialFormsComponent, {
imports: [ReactiveFormsModule, MaterialModule],
});
const nameControl = component.getByPlaceholderText('Name');
const scoreControl = component.getByPlaceholderText(/score/i);
const colorControl = component.getByPlaceholderText('color', { exact: false });
const errors = component.getByRole('alert');
expect(errors).toContainElement(component.queryByText('name is required'));
expect(errors).toContainElement(component.queryByText('score must be greater than 1'));
expect(errors).toContainElement(component.queryByText('color is required'));
component.type(nameControl, 'Tim');
component.type(scoreControl, 12);
component.selectOptions(colorControl, 'Green');
test('injects data into the component', async () => {
const component = await render(DataInjectedComponent, {
providers: [
{
provide: DATA,
useValue: { text: 'Hello boys and girls' },
},
],
});
expect(component.getByText(/Hello boys and girls/i)).toBeInTheDocument();
});
test(`should have form validations`, async () => {
const component = await render(AppComponent, {
imports: [ReactiveFormsModule],
providers: [provideMockStore()],
});
const appComponent = component.fixture.componentInstance as AppComponent;
expect(appComponent.form.valid).toBe(false);
const nameInput = component.getByLabelText('Name:');
const ageInput = component.getByLabelText('Age:');
const nameValue = appComponent.form.get('name');
const ageValue = appComponent.form.get('age');
component.type(nameInput, 'B');
expect(nameValue.valid).toBe(false);
test('works with provideMockStore', async () => {
const component = await render(WithNgRxMockStoreComponent, {
providers: [
provideMockStore({
selectors: [
{
selector: selectItems,
value: ['Four', 'Seven'],
},
],
}),
],
});
const store = TestBed.get(Store) as MockStore;
store.dispatch = jest.fn();
component.getByText('Four');
test('is possible to fill in a form and verify error messages (with the help of jest-dom https://testing-library.com/docs/ecosystem-jest-dom)', async () => {
const component = await render(FormsComponent, {
imports: [ReactiveFormsModule],
});
const nameControl = component.getByLabelText('Name');
const scoreControl = component.getByLabelText(/score/i);
const colorControl = component.getByLabelText('color', { exact: false });
const errors = component.getByRole('alert');
expect(errors).toContainElement(component.queryByText('name is required'));
expect(errors).toContainElement(component.queryByText('score must be greater than 1'));
expect(errors).toContainElement(component.queryByText('color is required'));
expect(nameControl).toBeInvalid();
component.type(nameControl, 'Tim');
component.type(scoreControl, '12');
component.blur(scoreControl);
test(`should render title in a h1 tag`, async () => {
const { container } = await render('', {
declarations: [AppComponent],
imports: [ReactiveFormsModule],
providers: [provideMockStore()],
});
expect(container.querySelector('h1').textContent).toContain('Welcome to app!');
});
test('renders the current value and can increment and decrement with a mocked jest-utils service', async () => {
const counter = createMock(CounterService);
let fakeCounterValue = 50;
counter.increment.mockImplementation(() => (fakeCounterValue += 10));
counter.decrement.mockImplementation(() => (fakeCounterValue -= 10));
counter.value.mockImplementation(() => fakeCounterValue);
const component = await render(ComponentWithProviderComponent, {
componentProviders: [
{
provide: CounterService,
useValue: counter,
},
],
});
const incrementControl = component.getByText('Increment');
const decrementControl = component.getByText('Decrement');
const valueControl = component.getByTestId('value');
expect(valueControl.textContent).toBe('50');
component.click(incrementControl);
component.click(incrementControl);