diff --git a/src/__tests__/acp-test-utils.ts b/src/__tests__/acp-test-utils.ts
index df6bcb74..b905d792 100644
--- a/src/__tests__/acp-test-utils.ts
+++ b/src/__tests__/acp-test-utils.ts
@@ -190,7 +190,14 @@ export function createBaseTestFixture(config: ConnectionConfig): TestFixture {
  * Use for integration tests that need to interact with the actual Codex binary.
  */
 export function createTestFixture(): TestFixture {
-    const pathToCodex = path.resolve(process.cwd(), "node_modules", ".bin", process.platform === 'win32' ? "codex.cmd" : "codex");
+    const bundledCodexPath = path.resolve(
+        process.cwd(),
+        "node_modules",
+        ".bin",
+        process.platform === 'win32' ? "codex.cmd" : "codex",
+    );
+    const pathToCodex = process.env["CODEX_PATH"] ?? bundledCodexPath;
+
     if (!fs.existsSync(pathToCodex)) {
         throw new Error(`Codex binary not found at ${pathToCodex}. Did you run 'npm install'?`);
     }