Migrate remaining StyleSheet Jest tests to Fantom

Summary:
Migrates the remaining StyleSheet unit tests from regular Jest (`-test.js`) to Fantom (`-itest.js`): `normalizeColor`, `processColor`, `processColorArray`, `processBackgroundImage`, and `StyleSheet`. These run on the React Native client at runtime, so they now run on Hermes in the real runtime.

Adaptations (no coverage weakened):
- Replaced `jest.spyOn(console, ...)` with manual save/replace/restore of the `console` method (Fantom does not provide `jest.spyOn`), both to assert and to suppress expected output.
- Replaced the module-mock delegation check in `normalizeColor` (which relied on `jest.mock`) with a behavioral assertion on the real implementation.
- These tests run on the Android runtime under Fantom (Jest defaulted to iOS); platform-specific requires were moved next to their platform branches where needed.

Changelog: [Internal]

Differential Revision: D108759085

Author: rubennorte

…/StyleSheet/__tests__/StyleSheet-test.js …StyleSheet/__tests__/StyleSheet-itest.jspackages/react-native/Libraries/StyleSheet/__tests__/StyleSheet-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/StyleSheet-itest.js packages/react-native/Libraries/StyleSheet/__tests__/StyleSheet-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/StyleSheet-itest.js

@@ -8,31 +8,36 @@
  * @format
  */
 
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
 import StyleSheet from '../StyleSheet';
 
 const setStyleAttributePreprocessor = StyleSheet.setStyleAttributePreprocessor;
 
-describe(setStyleAttributePreprocessor, () => {
-  beforeEach(() => {
-    jest.resetModules();
-    jest.spyOn(console, 'warn').mockImplementation(() => {});
-  });
+describe('setStyleAttributePreprocessor', () => {
+  const originalConsoleWarn = console.warn;
 
   afterEach(() => {
-    jest.restoreAllMocks();
+    // $FlowExpectedError[cannot-write]
+    console.warn = originalConsoleWarn;
   });
 
   it('should not show warning when set preprocessor first time', () => {
-    const spyConsole = jest.spyOn(global.console, 'warn');
+    const mockConsoleWarn = jest.fn();
+    // $FlowExpectedError[cannot-write]
+    console.warn = mockConsoleWarn;
+
     setStyleAttributePreprocessor(
       'fontFamily',
       (fontFamily: string) => fontFamily,
     );
-    expect(spyConsole).not.toHaveBeenCalled();
+    expect(mockConsoleWarn).not.toHaveBeenCalled();
   });
 
   it('should show warning when overwrite the preprocessor', () => {
-    const spyConsole = jest.spyOn(global.console, 'warn');
+    const mockConsoleWarn = jest.fn();
+    // $FlowExpectedError[cannot-write]
+    console.warn = mockConsoleWarn;
+
     setStyleAttributePreprocessor(
       'fontFamily',
       (fontFamily: string) => fontFamily,
@@ -41,7 +46,7 @@ describe(setStyleAttributePreprocessor, () => {
       'fontFamily',
       (fontFamily: string) => `Scoped-${fontFamily}`,
     );
-    expect(spyConsole).toHaveBeenCalledWith(
+    expect(mockConsoleWarn).toHaveBeenCalledWith(
       'Overwriting fontFamily style attribute preprocessor',
     );
   });

…leSheet/__tests__/normalizeColor-test.js …eSheet/__tests__/normalizeColor-itest.jspackages/react-native/Libraries/StyleSheet/__tests__/normalizeColor-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/normalizeColor-itest.js packages/react-native/Libraries/StyleSheet/__tests__/normalizeColor-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/normalizeColor-itest.js

@@ -8,16 +8,15 @@
  * @format
  */
 
-'use strict';
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
 
 const {OS} = require('../../Utilities/Platform').default;
 const normalizeColor = require('../normalizeColor').default;
 
 it('forwards calls to @react-native/normalize-colors', () => {
-  jest.resetModules().mock('@react-native/normalize-colors', () => jest.fn());
-
-  expect(require('../normalizeColor').default('#abc')).not.toBe(null);
-  expect(require('@react-native/normalize-colors')).toBeCalled();
+  // normalizeColor delegates string and number inputs to
+  // @react-native/normalize-colors, which returns a 0xrrggbbaa integer.
+  expect(normalizeColor('#abcdef')).toBe(0xabcdefff);
 });
 
 describe('iOS', () => {

…__tests__/processBackgroundImage-test.js …_tests__/processBackgroundImage-itest.jspackages/react-native/Libraries/StyleSheet/__tests__/processBackgroundImage-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processBackgroundImage-itest.js packages/react-native/Libraries/StyleSheet/__tests__/processBackgroundImage-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processBackgroundImage-itest.js

@@ -8,6 +8,8 @@
  * @format
  */
 
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
+
 import type {BackgroundImageValue} from '../StyleSheetTypes';
 
 import processBackgroundImage from '../processBackgroundImage';

…tyleSheet/__tests__/processColor-test.js …yleSheet/__tests__/processColor-itest.jspackages/react-native/Libraries/StyleSheet/__tests__/processColor-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processColor-itest.js packages/react-native/Libraries/StyleSheet/__tests__/processColor-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processColor-itest.js

@@ -8,7 +8,7 @@
  * @format
  */
 
-'use strict';
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
 
 const {OS} = require('../../Utilities/Platform').default;
 const PlatformColorAndroid =

…heet/__tests__/processColorArray-test.js …eet/__tests__/processColorArray-itest.jspackages/react-native/Libraries/StyleSheet/__tests__/processColorArray-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processColorArray-itest.js packages/react-native/Libraries/StyleSheet/__tests__/processColorArray-test.js renamed to packages/react-native/Libraries/StyleSheet/__tests__/processColorArray-itest.js

@@ -8,7 +8,7 @@
  * @format
  */
 
-'use strict';
+import '@react-native/fantom/src/setUpDefaultReactNativeEnvironment';
 
 const {OS} = require('../../Utilities/Platform').default;
 const PlatformColorAndroid =
@@ -28,6 +28,13 @@ const platformSpecific =
     : x => x;
 
 describe('processColorArray', () => {
+  const originalConsoleError = console.error;
+
+  afterEach(() => {
+    // $FlowExpectedError[cannot-write]
+    console.error = originalConsoleError;
+  });
+
   describe('predefined color name array', () => {
     it('should convert array of color name type', () => {
       const colorFromStringArray = processColorArray(['red', 'white', 'black']);
@@ -46,8 +53,7 @@ describe('processColorArray', () => {
       const expectedIntArray = [0xff0a141e, 0xff1e140a, 0xff3296fa].map(
         platformSpecific,
       );
-      // $FlowFixMe[incompatible-type]
-      expect(colorFromRGBArray).toEqual(platformSpecific(expectedIntArray));
+      expect(colorFromRGBArray).toEqual(expectedIntArray);
     });
 
     it('should convert array of color type hsl(x, y%, z%)', () => {
@@ -59,8 +65,7 @@ describe('processColorArray', () => {
       const expectedIntArray = [0xffdb3dac, 0xff234786, 0xff1e541d].map(
         platformSpecific,
       );
-      // $FlowFixMe[incompatible-type]
-      expect(colorFromHSLArray).toEqual(platformSpecific(expectedIntArray));
+      expect(colorFromHSLArray).toEqual(expectedIntArray);
     });
 
     it('should return null if no array', () => {
@@ -69,7 +74,9 @@ describe('processColorArray', () => {
     });
 
     it('converts invalid colors to transparent', () => {
-      const spy = jest.spyOn(console, 'error').mockReturnValue(undefined);
+      const mockConsoleError = jest.fn();
+      // $FlowExpectedError[cannot-write]
+      console.error = mockConsoleError;
 
       const colors = ['red', '???', null, undefined, false];
       // $FlowExpectedError[incompatible-type]
@@ -80,13 +87,11 @@ describe('processColorArray', () => {
       expect(colorFromStringArray).toEqual(expectedIntArray);
 
       for (const color of colors.slice(1)) {
-        expect(spy).toHaveBeenCalledWith(
+        expect(mockConsoleError).toHaveBeenCalledWith(
           'Invalid value in color array:',
           color,
         );
       }
-
-      spy.mockRestore();
     });
   });