add tests

packages/better-auth/src/db/to-zod.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import { toZodSchema } from "./to-zod";
+
+describe("toZodSchema", () => {
+	describe("returned: false field handling (issue #7489)", () => {
+		it("should include fields with returned: false in input schema (isClientSide: true)", () => {
+			const schema = toZodSchema({
+				fields: {
+					name: { type: "string", required: true },
+					secretField: { type: "string", required: true, returned: false },
+				},
+				isClientSide: true,
+			});
+
+			expect(schema.shape).toHaveProperty("name");
+			expect(schema.shape).toHaveProperty("secretField");
+		});
+
+		it("should exclude fields with returned: false from output schema (isClientSide: false)", () => {
+			const schema = toZodSchema({
+				fields: {
+					name: { type: "string", required: true },
+					secretField: { type: "string", required: true, returned: false },
+				},
+				isClientSide: false,
+			});
+
+			expect(schema.shape).toHaveProperty("name");
+			expect(schema.shape).not.toHaveProperty("secretField");
+		});
+	});
+});