diff --git a/backend/test/unit/openai.test.js b/backend/test/unit/openai.test.js
new file mode 100644
index 000000000..c381fef20
--- /dev/null
+++ b/backend/test/unit/openai.test.js
@@ -0,0 +1,9 @@
+const { OpenAIApi } = require("openai");
+const { setGptModel } = require("../../src/openai");
+
+test("GIVEN a new model WHEN setting the GPT model THEN the model is set", () => {
+  const session = { gptModel: "gpt-4" };
+  const model = "gpt-3.5-turbo";
+  setGptModel(session, model);
+  expect(session.gptModel).toBe(model);
+});