convert to URL for import

Author: SimenB

lib/createJestRunner.ts

@@ -1,3 +1,5 @@
+import * as path from 'path';
+import * as url from 'url';
 import type { TestResult } from '@jest/test-result';
 import type {
   CallbackTestRunnerInterface,
@@ -34,6 +36,15 @@ export default function createRunner<
   runPath: string,
   { getExtraOptions }: CreateRunnerOptions<ExtraOptions> = {},
 ) {
+  if (!runPath.startsWith('file')) {
+    if (!path.isAbsolute(runPath)) {
+      throw new Error(`Path must be absolute - got ${runPath}`);
+    }
+
+    // eslint-disable-next-line no-param-reassign
+    runPath = url.pathToFileURL(runPath).href;
+  }
+
   return class BaseTestRunner implements CallbackTestRunnerInterface {
     #globalConfig: Config.GlobalConfig;
 
@@ -123,7 +134,7 @@ export default function createRunner<
       onFailure: OnTestFailure,
       options: TestRunnerOptions,
     ): Promise<void> {
-      const worker = new Worker(runPath, {
+      const worker = new Worker(url.fileURLToPath(runPath), {
         exposedMethods: ['default'],
         numWorkers: this.#globalConfig.maxWorkers,
         forkOptions: { stdio: 'inherit' },