Add failing test case.

tests/cases/fourslash/autoImportsWithRootDirsAndRootedPath01.ts

@@ -0,0 +1,24 @@
+/// <reference path="./fourslash.ts" />
+
+// @Filename: /dir/foo.ts
+//// export function foo() {}
+
+// @Filename: /dir/bar.ts
+//// /*$*/
+
+// @Filename: /dir/tsconfig.json
+////{
+////    "compilerOptions": {
+////        "module": "amd",
+////        "moduleResolution": "classic",
+////        "rootDirs": ["D:/"]
+////    }
+////}
+
+goTo.marker("$");
+verify.completions({
+    preferences: {
+        includeCompletionsForModuleExports: true,
+        allowIncompleteCompletions: true,
+    }
+});