test: add windows to posix test case

packages/metro/src/lib/__tests__/__snapshots__/contextModuleTemplates-test.js.snap

@@ -113,3 +113,26 @@ metroEmptyContext.resolve = function metroContextResolve(request) {
 
 module.exports = metroEmptyContext;"
 `;
+
+exports[`getContextModuleTemplate creates posix paths on windows for sync template 1`] = `
+"// All of the requested modules are loaded behind enumerable getters.
+const map = Object.defineProperties({}, {
+  \\"./foo.js\\": { enumerable: true, get() { return require(\\"C:\\\\\\\\path\\\\\\\\to\\\\\\\\project\\\\\\\\src\\\\\\\\foo.js\\"); } },
+});
+
+function metroContext(request) {
+    return map[request];
+}
+
+// Return the keys that can be resolved.
+metroContext.keys = function metroContextKeys() {
+  return Object.keys(map);
+};
+
+// Return the module identifier for a user request.
+metroContext.resolve = function metroContextResolve(request) {
+  throw new Error('Unimplemented Metro module context functionality');
+}
+
+module.exports = metroContext;"
+`;

packages/metro/src/lib/__tests__/contextModuleTemplates-test.js

@@ -48,4 +48,15 @@ describe('getContextModuleTemplate', () => {
 
     expect(template).toMatchSnapshot();
   });
+
+  test('creates posix paths on windows for sync template', () => {
+    jest.resetModules();
+    jest.mock('path', () => jest.requireActual('path').win32);
+    const { getContextModuleTemplate: getWindowsTemplate } = require('../contextModuleTemplates');
+    const template = getWindowsTemplate('sync', 'c:/path/to/project/src', [
+      'C:\\path\\to\\project\\src\\foo.js',
+    ]);
+    expect(template).toMatch(/foo\.js/);
+    expect(template).toMatchSnapshot();
+  });
 });