test: add upload validation shape tests (121 tests)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: alexandre-mrt

tests/upload-shape.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test";
+import { Hono } from "hono";
+
+process.env.DATABASE_URL = ":memory:";
+const { dropRouter } = await import("../src/routes/drop");
+const app = new Hono();
+app.route("/api", dropRouter);
+
+describe("Upload validation shapes", () => {
+	test("missing file returns error with message", async () => {
+		const res = await app.request("/api/upload", { method: "POST" });
+		expect(res.status).toBe(400);
+		const json = await res.json();
+		expect(json).toHaveProperty("error");
+		expect(json.error.length).toBeGreaterThan(5);
+	});
+
+	test("empty file returns specific error", async () => {
+		const formData = new FormData();
+		formData.append("file", new File([], "empty.txt"));
+		const res = await app.request("/api/upload", { method: "POST", body: formData });
+		expect(res.status).toBe(400);
+		const json = await res.json();
+		expect(json.error).toContain("empty");
+	});
+});