fix: Missing handling for an unknown error type

src/components/Header/index.test.tsx

@@ -92,4 +92,18 @@ describe("Implementation Requirements", () => {
       });
     });
   });
+
+  it("should show an error snackbar when there is an unknown error type", async () => {
+    render(<Header />, {
+      wrapper: (p) => (
+        <Parent error={["Some unknown representation of an error"] as unknown as string} {...p} />
+      ),
+    });
+
+    await waitFor(() => {
+      expect(global.mockEnqueue).toHaveBeenCalledWith("An unknown error occurred during login", {
+        variant: "error",
+      });
+    });
+  });
 });

src/components/Header/index.tsx

@@ -12,11 +12,16 @@ const Header = () => {
   const tabletAndMobile = useMediaQuery("(max-width: 1024px)");
 
   useEffect(() => {
-    if (typeof authError !== "string") {
+    if (!authError) {
       return;
     }
 
-    enqueueSnackbar(authError, { variant: "error" });
+    enqueueSnackbar(
+      typeof authError === "string" && authError?.length > 0
+        ? authError
+        : "An unknown error occurred during login",
+      { variant: "error" }
+    );
   }, [authError]);
 
   return (