Add passing test case...

Author: JoshuaKGoldberg

tests/cases/fourslash/moveToNewFile_importFileExtensionsNonTypeModuleExistingJsImport.ts

@@ -0,0 +1,67 @@
+/// <reference path="fourslash.ts"/>
+
+// @Filename: /src/main.ts
+////import { message } from "./message.js";
+////
+////[|export function someLibFn(): string {
+////     return main();
+////}|]
+////
+////function main(): string {
+////    return message;
+////}
+////console.log(someLibFn());
+
+// @Filename: /message.ts
+////export const message = "hello world";
+
+// @Filename: /other.ts
+////import { someLibFn } from "./src/main.js";
+////
+////function someOtherFn(): string {
+////    return someLibFn();
+////}
+
+// @Filename: /act/action.ts
+////import { someLibFn } from "../src/main.js";
+////
+////function doAction(): string {
+////    return someLibFn();
+////}
+
+
+verify.moveToNewFile({
+    newFileContents: {
+      "/src/main.ts": 
+`import { message } from "./message.js";
+import { someLibFn } from "./someLibFn.js";
+
+export function main(): string {
+    return message;
+}
+console.log(someLibFn());`,
+
+      "/src/someLibFn.ts": 
+`import { main } from "./main.js";
+
+
+export function someLibFn(): string {
+    return main();
+}
+`,
+
+    "/other.ts": 
+`import { someLibFn } from "./src/someLibFn.js";
+
+function someOtherFn(): string {
+    return someLibFn();
+}`,
+
+  "/act/action.ts": 
+`import { someLibFn } from "../src/someLibFn.js";
+
+function doAction(): string {
+    return someLibFn();
+}`,
+    }
+});