fix: align ebay route with spec and validate params

packages/api-server/test/routes.test.ts

@@ -399,7 +399,7 @@ describe("API routes", () => {
     expect(body).toHaveLength(0);
   });
 
-  test("ebayRoute limits total items with maxItems in unstable mode", async () => {
+  test("ebayRoute passes through scraper payload unchanged in unstable mode", async () => {
     const { ebayRoute } = await import("../src/routes/ebay");
 
     fetchEbayItems.mockImplementation(() =>
@@ -416,10 +416,8 @@ describe("API routes", () => {
     );
 
     const body = await response.json();
-    const total = body.results.length + body.unstableResults.length;
-    expect(total).toBe(4);
     expect(body.results).toHaveLength(3);
-    expect(body.unstableResults).toHaveLength(1);
+    expect(body.unstableResults).toHaveLength(2);
     expect(body.results[0].title).toBe("a");
     expect(body.unstableResults[0].title).toBe("d");
   });
@@ -472,4 +470,74 @@ describe("API routes", () => {
     const body = await response.json();
     expect(body.message).toBe("Invalid maxItems parameter");
   });
+
+  test("ebayRoute returns 400 for invalid minPrice", async () => {
+    const { ebayRoute } = await import("../src/routes/ebay");
+
+    const response = await ebayRoute(
+      new Request(
+        "http://localhost/api/ebay?q=laptop&minPrice=abc",
+      ),
+    );
+
+    expect(response.status).toBe(400);
+    const body = await response.json();
+    expect(body.message).toBe("Invalid minPrice parameter");
+  });
+
+  test("ebayRoute returns 400 for invalid maxPrice", async () => {
+    const { ebayRoute } = await import("../src/routes/ebay");
+
+    const response = await ebayRoute(
+      new Request(
+        "http://localhost/api/ebay?q=laptop&maxPrice=abc",
+      ),
+    );
+
+    expect(response.status).toBe(400);
+    const body = await response.json();
+    expect(body.message).toBe("Invalid maxPrice parameter");
+  });
+
+  test("kijijiRoute returns 400 for invalid maxPages", async () => {
+    const { kijijiRoute } = await import("../src/routes/kijiji");
+
+    const response = await kijijiRoute(
+      new Request(
+        "http://localhost/api/kijiji?q=laptop&maxPages=abc",
+      ),
+    );
+
+    expect(response.status).toBe(400);
+    const body = await response.json();
+    expect(body.message).toBe("Invalid maxPages parameter");
+  });
+
+  test("kijijiRoute returns 400 for invalid priceMin", async () => {
+    const { kijijiRoute } = await import("../src/routes/kijiji");
+
+    const response = await kijijiRoute(
+      new Request(
+        "http://localhost/api/kijiji?q=laptop&priceMin=abc",
+      ),
+    );
+
+    expect(response.status).toBe(400);
+    const body = await response.json();
+    expect(body.message).toBe("Invalid priceMin parameter");
+  });
+
+  test("kijijiRoute returns 400 for invalid priceMax", async () => {
+    const { kijijiRoute } = await import("../src/routes/kijiji");
+
+    const response = await kijijiRoute(
+      new Request(
+        "http://localhost/api/kijiji?q=laptop&priceMax=abc",
+      ),
+    );
+
+    expect(response.status).toBe(400);
+    const body = await response.json();
+    expect(body.message).toBe("Invalid priceMax parameter");
+  });
 });