test: add MIME type DB persistence tests (141->144)

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

Author: alexandre-mrt

tests/mime-default.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, test } from "bun:test";
+
+process.env.DATABASE_URL = ":memory:";
+const { queries } = await import("../src/services/db");
+
+describe("MIME type defaults", () => {
+	test("stored mime type matches insert", () => {
+		queries.insertDrop.run({
+			$id: "mime-test", $rootHash: "0xm", $fileName: "m.pdf",
+			$fileSize: 100, $mimeType: "application/pdf", $passwordHash: null,
+			$maxDownloads: null, $expiresAt: null, $ipAddress: null,
+		});
+		const d = queries.getDrop.get("mime-test");
+		expect(d!.mime_type).toBe("application/pdf");
+	});
+
+	test("text/plain is preserved", () => {
+		queries.insertDrop.run({
+			$id: "mime-txt", $rootHash: "0xmt", $fileName: "t.txt",
+			$fileSize: 10, $mimeType: "text/plain", $passwordHash: null,
+			$maxDownloads: null, $expiresAt: null, $ipAddress: null,
+		});
+		expect(queries.getDrop.get("mime-txt")!.mime_type).toBe("text/plain");
+	});
+
+	test("octet-stream for unknown types", () => {
+		queries.insertDrop.run({
+			$id: "mime-bin", $rootHash: "0xmb", $fileName: "b.bin",
+			$fileSize: 10, $mimeType: "application/octet-stream", $passwordHash: null,
+			$maxDownloads: null, $expiresAt: null, $ipAddress: null,
+		});
+		expect(queries.getDrop.get("mime-bin")!.mime_type).toBe("application/octet-stream");
+	});
+});