feat: add selectOptions function (#41)

package.json

@@ -27,10 +27,12 @@
   },
   "dependencies": {
     "@angular/animations": "^8.0.0",
+    "@angular/cdk": "^8.1.4",
     "@angular/common": "^8.0.0",
     "@angular/compiler": "^8.0.0",
     "@angular/core": "^8.0.0",
     "@angular/forms": "^8.0.0",
+    "@angular/material": "^8.1.4",
     "@angular/platform-browser": "^8.0.0",
     "@angular/platform-browser-dynamic": "^8.0.0",
     "@angular/router": "^8.0.0",

projects/testing-library/src/lib/testing-library.ts

@@ -4,7 +4,7 @@ import { NoopAnimationsModule, BrowserAnimationsModule } from '@angular/platform
 import { TestBed, ComponentFixture } from '@angular/core/testing';
 import { getQueriesForElement, prettyDOM, fireEvent, FireObject, FireFunction } from '@testing-library/dom';
 import { RenderResult, RenderOptions } from './models';
-import { createType } from './user-events';
+import { createType, createSelectOptions } from './user-events';
 
 @Component({ selector: 'wrapper-component', template: '' })
 class WrapperComponent implements OnInit {
@@ -87,6 +87,7 @@ export async function render<T>(
     ...getQueriesForElement(fixture.nativeElement, queries),
     ...eventsWithDetectChanges,
     type: createType(eventsWithDetectChanges),
+    selectOptions: createSelectOptions(eventsWithDetectChanges),
   } as any;
 }
 

projects/testing-library/src/lib/user-events/index.ts

@@ -1,10 +1,13 @@
 import { fireEvent } from '@testing-library/dom';
 import { createType } from './type';
+import { createSelectOptions } from './selectOptions';
 
 export interface UserEvents {
   type: ReturnType<typeof createType>;
+  selectOptions: ReturnType<typeof createSelectOptions>;
 }
 
 const type = createType(fireEvent);
+const selectOptions = createSelectOptions(fireEvent);
 
-export { createType, type };
+export { createType, type, createSelectOptions, selectOptions };

projects/testing-library/src/lib/user-events/selectOptions.ts

@@ -0,0 +1,67 @@
+import {
+  FireFunction,
+  FireObject,
+  Matcher,
+  getByText,
+  SelectorMatcherOptions,
+  queryByText,
+} from '@testing-library/dom';
+
+// implementation from https://github.com/testing-library/user-event
+export function createSelectOptions(fireEvent: FireFunction & FireObject) {
+  function clickElement(element: HTMLElement) {
+    fireEvent.mouseOver(element);
+    fireEvent.mouseMove(element);
+    fireEvent.mouseDown(element);
+    fireEvent.focus(element);
+    fireEvent.mouseUp(element);
+    fireEvent.click(element);
+  }
+
+  function selectOption(select: HTMLSelectElement, index: number, matcher: Matcher, options?: SelectorMatcherOptions) {
+    // fallback to document.body, because libraries as Angular Material will have their custom select component
+    const option = (queryByText(select, matcher, options) ||
+      getByText(document.body, matcher, options)) as HTMLOptionElement;
+
+    fireEvent.mouseOver(option);
+    fireEvent.mouseMove(option);
+    fireEvent.mouseDown(option);
+    fireEvent.focus(option);
+    fireEvent.mouseUp(option);
+    fireEvent.click(option, { ctrlKey: index > 0 });
+
+    option.selected = true;
+    fireEvent.change(select);
+  }
+
+  return async function selectOptions(
+    element: HTMLElement,
+    matcher: Matcher | Matcher[],
+    matcherOptions?: SelectorMatcherOptions,
+  ) {
+    const selectElement = element as HTMLSelectElement;
+
+    if (selectElement.selectedOptions) {
+      Array.from(selectElement.selectedOptions).forEach(option => (option.selected = false));
+    }
+
+    const focusedElement = document.activeElement;
+    const wasAnotherElementFocused = focusedElement !== document.body && focusedElement !== selectElement;
+
+    if (wasAnotherElementFocused) {
+      fireEvent.mouseMove(focusedElement);
+      fireEvent.mouseLeave(focusedElement);
+    }
+
+    clickElement(selectElement);
+
+    const values = Array.isArray(matcher) ? matcher : [matcher];
+    values
+      .filter((_, index) => index === 0 || selectElement.multiple)
+      .forEach((val, index) => selectOption(selectElement, index, val, matcherOptions));
+
+    if (wasAnotherElementFocused) {
+      fireEvent.blur(focusedElement);
+    }
+  };
+}

projects/testing-library/tests/user-events/selectOptions.spec.ts

@@ -0,0 +1,236 @@
+import { ReactiveFormsModule, FormsModule, FormControl } from '@angular/forms';
+import { render, RenderResult } from '../../src/public_api';
+import { Component, ViewChild, Input } from '@angular/core';
+
+describe('selectOption: single', () => {
+  test('with a template-driven form', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" [(ngModel)]="value">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value: string;
+    }
+
+    const component = await render(FixtureComponent, {
+      imports: [FormsModule],
+    });
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value);
+  });
+
+  test('with a reactive form', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" [formControl]="value">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value.value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value = new FormControl('');
+    }
+
+    const component = await render(FixtureComponent, {
+      imports: [ReactiveFormsModule],
+    });
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value.value);
+  });
+
+  test('with change event', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" (change)="onChange($event)">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value = '';
+
+      onChange(event: KeyboardEvent) {
+        this.value = (<HTMLInputElement>event.target).value;
+      }
+    }
+
+    const component = await render(FixtureComponent);
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value);
+  });
+
+  test('by reference', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" #input>
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ input.value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      @ViewChild('input', { static: false }) value;
+    }
+
+    const component = await render(FixtureComponent);
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value.nativeElement.value);
+  });
+
+  function assertSelectOptions(component: RenderResult, value: () => string) {
+    const inputControl = component.getByTestId('select') as HTMLSelectElement;
+    component.selectOptions(inputControl, /apples/i);
+    component.selectOptions(inputControl, 'Oranges');
+
+    expect(value()).toBe('2');
+    expect(component.getByTestId('text').textContent).toBe('2');
+    expect(inputControl.value).toBe('2');
+
+    expect((component.getByTestId('apples') as HTMLOptionElement).selected).toBe(false);
+    expect((component.getByTestId('oranges') as HTMLOptionElement).selected).toBe(true);
+    expect((component.getByTestId('lemons') as HTMLOptionElement).selected).toBe(false);
+  }
+});
+
+describe('selectOption: multiple', () => {
+  test('with a template-driven form', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" multiple [(ngModel)]="value">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value: string;
+    }
+
+    const component = await render(FixtureComponent, {
+      imports: [FormsModule],
+    });
+    assertSelectOptions(component, () => component.fixture.componentInstance.value);
+  });
+
+  test('with a reactive form', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" multiple [formControl]="value">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value.value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value = new FormControl('');
+    }
+
+    const component = await render(FixtureComponent, {
+      imports: [ReactiveFormsModule],
+    });
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value.value);
+  });
+
+  test('with change event', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" multiple (change)="onChange($event)">
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      value = [];
+
+      onChange(event: KeyboardEvent) {
+        this.value = Array.from((<HTMLSelectElement>event.target).selectedOptions).map(o => o.value);
+      }
+    }
+
+    const component = await render(FixtureComponent);
+
+    assertSelectOptions(component, () => component.fixture.componentInstance.value);
+  });
+
+  test('by reference', async () => {
+    @Component({
+      selector: 'fixture',
+      template: `
+        <select data-testid="select" multiple #input>
+          <option value="1" data-testid="apples">Apples</option>
+          <option value="2" data-testid="oranges">Oranges</option>
+          <option value="3" data-testid="lemons">Lemons</option>
+        </select>
+
+        <p data-testid="text">{{ input.value }}</p>
+      `,
+    })
+    class FixtureComponent {
+      @ViewChild('input', { static: false }) value;
+    }
+
+    const component = await render(FixtureComponent);
+
+    const inputControl = component.getByTestId('select') as HTMLSelectElement;
+    component.selectOptions(inputControl, /apples/i);
+    component.selectOptions(inputControl, ['Oranges', 'Lemons']);
+
+    const options = component.fixture.componentInstance.value.nativeElement.selectedOptions;
+    const value = Array.from(options).map((o: any) => o.value);
+
+    expect(value).toEqual(['2', '3']);
+    // shouldn't this be an empty string? - https://stackblitz.com/edit/angular-pdvm9n
+    expect(component.getByTestId('text').textContent).toBe('2');
+    expect((component.getByTestId('apples') as HTMLOptionElement).selected).toBe(false);
+    expect((component.getByTestId('oranges') as HTMLOptionElement).selected).toBe(true);
+    expect((component.getByTestId('lemons') as HTMLOptionElement).selected).toBe(true);
+  });
+
+  function assertSelectOptions(component: RenderResult, value: () => string) {
+    const inputControl = component.getByTestId('select') as HTMLSelectElement;
+    component.selectOptions(inputControl, /apples/i);
+    component.selectOptions(inputControl, ['Oranges', 'Lemons']);
+
+    expect(value()).toEqual(['2', '3']);
+    expect(component.getByTestId('text').textContent).toBe('2,3');
+    expect((component.getByTestId('apples') as HTMLOptionElement).selected).toBe(false);
+    expect((component.getByTestId('oranges') as HTMLOptionElement).selected).toBe(true);
+    expect((component.getByTestId('lemons') as HTMLOptionElement).selected).toBe(true);
+  }
+});