feat: toHaveDisplayValue matcher (#1463)

* feat: to have display value

* add tests for toHaveDisplayValue()

* update type of toHaveDisplayValue matcher

* rename test file

* format

* chore: add more tests

* refactor: extract common TextInput utils

* chore: fix codecov

---------

Co-authored-by: Jan Jaworski <[email protected]>

Author: mdjastrzebski

src/fireEvent.ts

@@ -10,6 +10,7 @@ import act from './act';
 import { isHostElement } from './helpers/component-tree';
 import { isHostTextInput } from './helpers/host-component-names';
 import { isPointerEventEnabled } from './helpers/pointer-events';
+import { isTextInputEditable } from './helpers/text-input';
 
 type EventHandler = (...args: unknown[]) => unknown;
 
@@ -53,7 +54,7 @@ export function isEventEnabled(
 ) {
   if (isHostTextInput(nearestTouchResponder)) {
     return (
-      nearestTouchResponder?.props.editable !== false ||
+      isTextInputEditable(nearestTouchResponder) ||
       textInputEventsIgnoringEditableProp.has(eventName)
     );
   }

src/helpers/__tests__/text-input.test.tsx

@@ -0,0 +1,22 @@
+import * as React from 'react';
+import { View } from 'react-native';
+import { render, screen } from '../..';
+import { getTextInputValue, isTextInputEditable } from '../text-input';
+
+test('getTextInputValue() throws error when invoked on non-text input', () => {
+  render(<View testID="view" />);
+
+  const view = screen.getByTestId('view');
+  expect(() => getTextInputValue(view)).toThrowErrorMatchingInlineSnapshot(
+    `"Element is not a "TextInput", but it has type "View"."`
+  );
+});
+
+test('isTextInputEditable() throws error when invoked on non-text input', () => {
+  render(<View testID="view" />);
+
+  const view = screen.getByTestId('view');
+  expect(() => isTextInputEditable(view)).toThrowErrorMatchingInlineSnapshot(
+    `"Element is not a "TextInput", but it has type "View"."`
+  );
+});

src/helpers/text-input.ts

@@ -0,0 +1,22 @@
+import { ReactTestInstance } from 'react-test-renderer';
+import { isHostTextInput } from './host-component-names';
+
+export function isTextInputEditable(element: ReactTestInstance) {
+  if (!isHostTextInput(element)) {
+    throw new Error(
+      `Element is not a "TextInput", but it has type "${element.type}".`
+    );
+  }
+
+  return element.props.editable !== false;
+}
+
+export function getTextInputValue(element: ReactTestInstance) {
+  if (!isHostTextInput(element)) {
+    throw new Error(
+      `Element is not a "TextInput", but it has type "${element.type}".`
+    );
+  }
+
+  return element.props.value ?? element.props.defaultValue;
+}

src/matchers/__tests__/to-have-display-value.test.tsx

@@ -0,0 +1,87 @@
+import * as React from 'react';
+import { TextInput, View } from 'react-native';
+import { render, screen } from '../..';
+import '../extend-expect';
+
+test('example test', () => {
+  render(<TextInput testID="text-input" value="test" />);
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).toHaveDisplayValue('test');
+});
+
+test('toHaveDisplayValue() on matching display value', () => {
+  render(<TextInput testID="text-input" value="test" />);
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).toHaveDisplayValue('test');
+
+  expect(() => expect(textInput).not.toHaveDisplayValue('test'))
+    .toThrowErrorMatchingInlineSnapshot(`
+    "expect(element).not.toHaveDisplayValue()
+
+    Expected element not to have display value:
+      test
+    Received:
+      test"
+  `);
+});
+
+test('toHaveDisplayValue() on non-matching display value', () => {
+  render(<TextInput testID="text-input" value="test" />);
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).not.toHaveDisplayValue('non-test');
+
+  expect(() => expect(textInput).toHaveDisplayValue('non-test'))
+    .toThrowErrorMatchingInlineSnapshot(`
+    "expect(element).toHaveDisplayValue()
+
+    Expected element to have display value:
+      non-test
+    Received:
+      test"
+  `);
+});
+
+test("toHaveDisplayValue() on non-'TextInput' elements", () => {
+  render(<View testID="view" />);
+
+  const view = screen.getByTestId('view');
+  expect(() =>
+    expect(view).toHaveDisplayValue('test')
+  ).toThrowErrorMatchingInlineSnapshot(
+    `"toHaveDisplayValue() works only with host "TextInput" elements. Passed element has type "View"."`
+  );
+});
+
+test('toHaveDisplayValue() performing partial match', () => {
+  render(<TextInput testID="text-input" value="Hello World" />);
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).toHaveDisplayValue('Hello World');
+
+  expect(textInput).not.toHaveDisplayValue('hello world');
+  expect(textInput).not.toHaveDisplayValue('Hello');
+  expect(textInput).not.toHaveDisplayValue('World');
+
+  expect(textInput).toHaveDisplayValue('Hello World', { exact: false });
+  expect(textInput).toHaveDisplayValue('hello', { exact: false });
+  expect(textInput).toHaveDisplayValue('world', { exact: false });
+});
+
+test('toHaveDisplayValue() uses defaultValue', () => {
+  render(<TextInput testID="text-input" defaultValue="default" />);
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).toHaveDisplayValue('default');
+});
+
+test('toHaveDisplayValue() prioritizes value over defaultValue', () => {
+  render(
+    <TextInput testID="text-input" value="value" defaultValue="default" />
+  );
+
+  const textInput = screen.getByTestId('text-input');
+  expect(textInput).toHaveDisplayValue('value');
+});

src/matchers/extend-expect.d.ts

@@ -1,6 +1,9 @@
+import { TextMatch, TextMatchOptions } from '../matches';
+
 export interface JestNativeMatchers<R> {
   toBeOnTheScreen(): R;
   toBeEmptyElement(): R;
+  toHaveDisplayValue(expectedValue: TextMatch, options?: TextMatchOptions): R;
 }
 
 // Implicit Jest global `expect`.

src/matchers/extend-expect.ts

@@ -2,8 +2,10 @@
 
 import { toBeOnTheScreen } from './to-be-on-the-screen';
 import { toBeEmptyElement } from './to-be-empty-element';
+import { toHaveDisplayValue } from './to-have-display-value';
 
 expect.extend({
   toBeOnTheScreen,
   toBeEmptyElement,
+  toHaveDisplayValue,
 });

src/matchers/to-have-display-value.tsx

@@ -0,0 +1,49 @@
+import type { ReactTestInstance } from 'react-test-renderer';
+import { matcherHint } from 'jest-matcher-utils';
+import { isHostTextInput } from '../helpers/host-component-names';
+import { ErrorWithStack } from '../helpers/errors';
+import { getTextInputValue } from '../helpers/text-input';
+import { TextMatch, TextMatchOptions, matches } from '../matches';
+import { checkHostElement, formatMessage } from './utils';
+
+export function toHaveDisplayValue(
+  this: jest.MatcherContext,
+  element: ReactTestInstance,
+  expectedValue: TextMatch,
+  options?: TextMatchOptions
+) {
+  checkHostElement(element, toHaveDisplayValue, this);
+
+  if (!isHostTextInput(element)) {
+    throw new ErrorWithStack(
+      `toHaveDisplayValue() works only with host "TextInput" elements. Passed element has type "${element.type}".`,
+      toHaveDisplayValue
+    );
+  }
+
+  const receivedValue = getTextInputValue(element);
+
+  return {
+    pass: matches(
+      expectedValue,
+      receivedValue,
+      options?.normalizer,
+      options?.exact
+    ),
+    message: () => {
+      return [
+        formatMessage(
+          matcherHint(
+            `${this.isNot ? '.not' : ''}.toHaveDisplayValue`,
+            'element',
+            ''
+          ),
+          `Expected element ${this.isNot ? 'not to' : 'to'} have display value`,
+          expectedValue,
+          'Received',
+          receivedValue
+        ),
+      ].join('\n');
+    },
+  };
+}

src/queries/displayValue.ts

@@ -1,6 +1,7 @@
 import type { ReactTestInstance } from 'react-test-renderer';
 import { findAll } from '../helpers/findAll';
 import { isHostTextInput } from '../helpers/host-component-names';
+import { getTextInputValue } from '../helpers/text-input';
 import { matches, TextMatch, TextMatchOptions } from '../matches';
 import { makeQueries } from './makeQueries';
 import type {
@@ -17,13 +18,12 @@ type ByDisplayValueOptions = CommonQueryOptions & TextMatchOptions;
 
 const matchDisplayValue = (
   node: ReactTestInstance,
-  value: TextMatch,
+  expectedValue: TextMatch,
   options: TextMatchOptions = {}
 ) => {
   const { exact, normalizer } = options;
-  const nodeValue = node.props.value ?? node.props.defaultValue;
-
-  return matches(value, nodeValue, normalizer, exact);
+  const nodeValue = getTextInputValue(node);
+  return matches(expectedValue, nodeValue, normalizer, exact);
 };
 
 const queryAllByDisplayValue = (

src/user-event/clear.ts

@@ -1,10 +1,11 @@
 import { ReactTestInstance } from 'react-test-renderer';
 import { ErrorWithStack } from '../helpers/errors';
 import { isHostTextInput } from '../helpers/host-component-names';
+import { isTextInputEditable } from '../helpers/text-input';
 import { isPointerEventEnabled } from '../helpers/pointer-events';
 import { EventBuilder } from './event-builder';
 import { UserEventInstance } from './setup';
-import { dispatchEvent, wait, isEditableTextInput } from './utils';
+import { dispatchEvent, wait } from './utils';
 import { emitTypingEvents } from './type/type';
 
 export async function clear(
@@ -18,7 +19,7 @@ export async function clear(
     );
   }
 
-  if (!isEditableTextInput(element) || !isPointerEventEnabled(element)) {
+  if (!isTextInputEditable(element) || !isPointerEventEnabled(element)) {
     return;
   }
 

src/user-event/press/press.ts

@@ -1,16 +1,15 @@
 import { ReactTestInstance } from 'react-test-renderer';
 import act from '../../act';
 import { getHostParent } from '../../helpers/component-tree';
+import { isTextInputEditable } from '../../helpers/text-input';
 import { isPointerEventEnabled } from '../../helpers/pointer-events';
-import { isHostText } from '../../helpers/host-component-names';
+import {
+  isHostText,
+  isHostTextInput,
+} from '../../helpers/host-component-names';
 import { EventBuilder } from '../event-builder';
 import { UserEventConfig, UserEventInstance } from '../setup';
-import {
-  dispatchEvent,
-  isEditableTextInput,
-  wait,
-  warnAboutRealTimersIfNeeded,
-} from '../utils';
+import { dispatchEvent, wait, warnAboutRealTimersIfNeeded } from '../utils';
 import { DEFAULT_MIN_PRESS_DURATION } from './constants';
 
 export interface PressOptions {
@@ -53,7 +52,11 @@ const basePress = async (
     return;
   }
 
-  if (isEditableTextInput(element) && isPointerEventEnabled(element)) {
+  if (
+    isHostTextInput(element) &&
+    isTextInputEditable(element) &&
+    isPointerEventEnabled(element)
+  ) {
     await emitTextInputPressEvents(config, element, options);
     return;
   }