[Fabric] Implement selectTextOnFocus prop in TextInput (#14641)

Author: anupriya13

change/react-native-windows-01615f82-6942-4a39-8608-3e010f4b9009.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[Fabric] Implement selectTextOnFocus in Text Input",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/@react-native-windows/tester/src/js/examples/TextInput/TextInputExample.windows.js

@@ -209,6 +209,30 @@ const examples: Array<RNTesterModuleExample> = [
       );
     },
   },
+  {
+    title: 'Select text on focus',
+    render: function (): React.Node {
+      return (
+        <View>
+          <Text>Select text on focus:</Text>
+          <ExampleTextInput
+            selectTextOnFocus={true}
+            style={styles.singleLine}
+            testID="select-text-on-focus"
+          />
+          <Text>
+            Do not select text on focus if clear text on focus is enabled:
+          </Text>
+          <ExampleTextInput
+            selectTextOnFocus={true}
+            clearTextOnFocus={true}
+            style={styles.singleLine}
+            testID="select-text-on-focus-while-clear-text-on-focus"
+          />
+        </View>
+      );
+    },
+  },
   {
     title: 'Colors and text inputs',
     render: function (): React.Node {

packages/e2e-test-app-fabric/test/TextInputComponentTest.test.ts

@@ -504,6 +504,59 @@ describe('TextInput Tests', () => {
     // Verify the textInput contents are cleared after regaining focus
     expect(await componentFocusTrue.getText()).toBe('');
   });
+  test('TextInputs can select text on focus', async () => {
+    const component = await app.findElementByTestID('select-text-on-focus');
+    await component.waitForDisplayed({timeout: 5000});
+
+    await app.waitUntil(
+      async () => {
+        await component.setValue('Hello World');
+        return (await component.getText()) === 'Hello World';
+      },
+      {
+        interval: 1500,
+        timeout: 5000,
+        timeoutMsg: `Unable to enter correct text.`,
+      },
+    );
+
+    // Check if the text is selected on focus.
+    await component.click();
+
+    const dump = await dumpVisualTree('select-text-on-focus');
+    expect(dump).toMatchSnapshot();
+  });
+  test('TextInputs can clear text on focus even if selectTextOnFocus == true', async () => {
+    const targetComponent = await app.findElementByTestID(
+      'select-text-on-focus-while-clear-text-on-focus',
+    );
+    await targetComponent.waitForDisplayed({timeout: 5000});
+
+    await app.waitUntil(
+      async () => {
+        await targetComponent.setValue('Hello World');
+        return (await targetComponent.getText()) === 'Hello World';
+      },
+      {
+        interval: 1500,
+        timeout: 5000,
+        timeoutMsg: `Unable to enter correct text.`,
+      },
+    );
+
+    // Click on the previous textInput to move focus away from this TextInput
+    const anotherTextInput = await app.findElementByTestID(
+      'select-text-on-focus',
+    );
+    await anotherTextInput.waitForDisplayed({timeout: 5000});
+    await anotherTextInput.click();
+
+    // Now click on the tested component, make sure the text is cleared.
+    await targetComponent.click();
+
+    // Verify the textInput contents are cleared after regaining focus
+    expect(await targetComponent.getText()).toBe('');
+  });
   test('TextInputs can have inline images', async () => {
     const component = await app.findElementByTestID('textinput-inline-images');
     await component.waitForDisplayed({timeout: 5000});