fix failed tests on Windows #8737 (#8747)

* fix failed tests on Windows #8737

* Use regexp literal instead of `RegExp` constructor so that we don't need to bother with escaping special character like `\` and `.`.
Note that by removing the path separator in regexp, I've relaxed the matching condition a little.Since there's little chance we have files like `XXXReact.d.ts`,it should not matter.

scripts/jest/ts-preprocessor.js

@@ -23,16 +23,12 @@ function compile(content, contentFilename) {
   var compilerHost = {
     getSourceFile(filename, languageVersion) {
       var source;
+      var jestRegex = /jest\.d\.ts/;
+      var reactRegex = /(?:React|ReactDOM)(?:\.d)?\.ts$/;
 
-      // `path.normalize` and `path.join` are used to turn forward slashes in
+      // `path.normalize` is used to turn forward slashes in
       // the file path into backslashes on Windows.
       filename = path.normalize(filename);
-      var reactRegex = new RegExp(
-        path.join('/', '(?:React|ReactDOM)(?:\.d)?\.ts$')
-      );
-
-      var jestRegex = /jest\.d\.ts/;
-
       if (filename === 'lib.d.ts') {
         source = fs.readFileSync(
           require.resolve('typescript/lib/lib.d.ts')

src/isomorphic/modern/class/__tests__/ReactClassEquivalence-test.js

@@ -31,14 +31,14 @@ describe('ReactClassEquivalence', () => {
 
 function runJest(testFile) {
   var cwd = process.cwd();
-  var jestBin = path.resolve('node_modules', '.bin', 'jest');
+  var extension = process.platform === 'win32' ? '.cmd' : '';
+  var jestBin = path.resolve('node_modules', '.bin', 'jest' + extension);
   var setupFile = path.resolve(
     'scripts',
     'jest',
     'setupSpecEquivalenceReporter.js'
   );
-  var result = spawnSync('node', [
-    jestBin,
+  var result = spawnSync(jestBin, [
     testFile,
     '--setupTestFrameworkScriptFile',
     setupFile,