diff --git a/code-server/main.test.ts b/code-server/main.test.ts
index daf3ac1..1d6da5e 100644
--- a/code-server/main.test.ts
+++ b/code-server/main.test.ts
@@ -1,5 +1,9 @@
 import { describe, expect, it } from "bun:test";
-import { runTerraformInit, testRequiredVariables } from "../test";
+import {
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+} from "../test";
 
 describe("code-server", async () => {
   await runTerraformInit(import.meta.dir);
@@ -8,5 +12,27 @@ describe("code-server", async () => {
     agent_id: "foo",
   });
 
+  it("use_cached and offline can not be used together", () => {
+    const t = async () => {
+      await runTerraformApply(import.meta.dir, {
+        agent_id: "foo",
+        use_cached: "true",
+        offline: "true",
+      });
+    };
+    expect(t).toThrow("Offline and Use Cached can not be used together");
+  });
+
+  it("offline and extensions can not be used together", () => {
+    const t = async () => {
+      await runTerraformApply(import.meta.dir, {
+        agent_id: "foo",
+        offline: "true",
+        extensions: '["1", "2"]',
+      });
+    };
+    expect(t).toThrow("Offline mode does not allow extensions to be installed");
+  });
+
   // More tests depend on shebang refactors
 });