diff --git a/functions/get-order.spec.ts b/functions/get-order.spec.ts
new file mode 100644
index 00000000..341a4fe5
--- /dev/null
+++ b/functions/get-order.spec.ts
@@ -0,0 +1,82 @@
+import { env, createExecutionContext, waitOnExecutionContext, Parameters } from "cloudflare:test";
+import { describe, it, expect } from "vitest";
+import { onRequest, getTransactionFromOrderId } from "./get-order";
+import { getAccessToken } from "./helpers";
+
+function createContext(baseUrl: string, params: Record<string, string>) {
+  const url = new URL(baseUrl);
+  url.search = new URLSearchParams(params).toString();
+  const request = new Request(url);
+  const ctx = createExecutionContext();
+  const eventCtx: Parameters<typeof onRequest>[0] = {
+    request,
+    functionPath: "",
+    waitUntil: ctx.waitUntil.bind(ctx),
+    passThroughOnException: ctx.passThroughOnException.bind(ctx),
+    env,
+  };
+  return { request, ctx, eventCtx };
+}
+
+const DEFAULT_BASE_URL = "http:/placeholder";
+
+describe("Get Orders", () => {
+  it("throws 404 for non-existent order", async () => {
+    const { ctx, eventCtx } = createContext(DEFAULT_BASE_URL, { orderId: "1" });
+
+    const response = await onRequest(eventCtx);
+    await waitOnExecutionContext(ctx);
+
+    expect(response.status).toBe(404);
+    expect(await response.text()).toContain("Order not found");
+  });
+
+  it("throws 500 for missing order id", async () => {
+    const { ctx, eventCtx } = createContext(DEFAULT_BASE_URL, {});
+
+    const response = await onRequest(eventCtx);
+    await waitOnExecutionContext(ctx);
+    expect(response.status).toBe(500);
+    expect(await response.text()).toContain("There was an error while processing your request");
+  });
+
+  it("throws 404 for non-existent order", async () => {
+    const { ctx, eventCtx } = createContext(DEFAULT_BASE_URL, { orderId: "1" });
+
+    const response = await onRequest(eventCtx);
+    await waitOnExecutionContext(ctx);
+    expect(response.status).toBe(404);
+  });
+  it.skip("found existing but unsuccessfull transaction", async () => {
+    const { ctx, eventCtx } = createContext(DEFAULT_BASE_URL, { orderId: "1" });
+
+    const response = await onRequest(eventCtx);
+    await waitOnExecutionContext(ctx);
+    expect(response.status).toBe(404);
+  });
+
+  it.skip("found existing and successful transaction", async () => {
+    // TODO
+    const existingSuccessfulTransaction = { id: "asd" };
+    const { ctx, eventCtx } = createContext(DEFAULT_BASE_URL, { orderId: existingSuccessfulTransaction.id });
+
+    const response = await onRequest(eventCtx);
+    await waitOnExecutionContext(ctx);
+    expect(response.status).toBe(404);
+  });
+});
+
+describe("Get order helpers", () => {
+  it("wrong credentials", async () => {
+    void expect(() => getTransactionFromOrderId("asd", { token: "token", isSandbox: true })).rejects.toThrowError(
+      'Error from Reloadly API: {"status":401,"message":"Full authentication is required to access this resource"}'
+    );
+  });
+
+  it("wrong mode (not sandbox)", async () => {
+    const accessToken = await getAccessToken(env);
+    void expect(() => getTransactionFromOrderId("asd", { token: accessToken.token, isSandbox: !accessToken.isSandbox })).rejects.toThrowError(
+      'Error from Reloadly API: {"status":401,"message":"Invalid token, are you in production & using a sandbox token or vice-versa?"}'
+    );
+  });
+});