diff --git a/packages/shim-deno/src/deno/stable/variables/mainModule.test.ts b/packages/shim-deno/src/deno/stable/variables/mainModule.test.ts
new file mode 100644
index 0000000..7723e0c
--- /dev/null
+++ b/packages/shim-deno/src/deno/stable/variables/mainModule.test.ts
@@ -0,0 +1,12 @@
+import assert from "assert/strict";
+import { fileURLToPath, pathToFileURL } from "url";
+import { join, resolve } from "path";
+
+import { mainModule } from "./mainModule.js";
+
+Deno.test("should get entrypoint", () => {
+  const path = resolve(
+    join(fileURLToPath(import.meta.url), "../../../../../tools/run_tests.mjs"),
+  );
+  assert.equal(mainModule, pathToFileURL(path).toString());
+});
diff --git a/packages/shim-deno/src/deno/stable/variables/mainModule.ts b/packages/shim-deno/src/deno/stable/variables/mainModule.ts
index 83868b7..4746786 100644
--- a/packages/shim-deno/src/deno/stable/variables/mainModule.ts
+++ b/packages/shim-deno/src/deno/stable/variables/mainModule.ts
@@ -3,5 +3,5 @@ import { join } from "path";
 import { pathToFileURL } from "url";
 
 export const mainModule: typeof Deno.mainModule = pathToFileURL(
-  process.argv[1] ?? join(Deno.cwd(), "$deno$repl.ts"),
+  process.argv[1] ?? join(process.cwd(), "$deno$repl.ts"),
 ).href;
diff --git a/packages/shim-deno/tools/working_test_files.txt b/packages/shim-deno/tools/working_test_files.txt
index ce0cbe5..823d11d 100644
--- a/packages/shim-deno/tools/working_test_files.txt
+++ b/packages/shim-deno/tools/working_test_files.txt
@@ -2,6 +2,7 @@ src/deno/internal/streams.test.ts
 src/deno/stable/functions/open.test.ts
 src/deno/stable/functions/resolveDns.test.ts
 src/deno/stable/functions/run.test.ts
+src/deno/stable/variables/mainModule.test.ts
 third_party/deno/cli/tests/unit/abort_controller_test.ts
 third_party/deno/cli/tests/unit/blob_test.ts
 third_party/deno/cli/tests/unit/build_test.ts