fix(testing): use rootDir to resolve files with ts

packages/jest/plugins/resolver.ts

@@ -1,4 +1,4 @@
-import { dirname, extname } from 'path';
+import { dirname, extname, join } from 'path';
 import { resolve as resolveExports } from 'resolve.exports';
 import type defaultResolver from 'jest-resolve/build/defaultResolver';
 
@@ -81,7 +81,11 @@ module.exports = function (path: string, options: ResolveOptions) {
     ts = ts || require('typescript');
     compilerSetup = compilerSetup || getCompilerSetup(options.rootDir);
     const { compilerOptions, host } = compilerSetup;
-    return ts.resolveModuleName(path, options.basedir, compilerOptions, host)
-      .resolvedModule.resolvedFileName;
+    return ts.resolveModuleName(
+      path,
+      join(options.basedir, 'fake-placeholder.ts'),
+      compilerOptions,
+      host
+    ).resolvedModule.resolvedFileName;
   }
 };