chore: import upstream snapshot with attribution

packages/plugins/forms/tests/client-submit-response.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+
+import { parseSubmitResponse } from "../src/client/index.js";
+
+describe("parseSubmitResponse", () => {
+	it("unwraps successful plugin API responses from the standard API envelope", () => {
+		expect(
+			parseSubmitResponse({
+				data: {
+					success: true,
+					message: "Thanks",
+					redirect: "/thanks",
+				},
+			}),
+		).toEqual({ success: true, message: "Thanks", redirect: "/thanks" });
+	});
+
+	it("keeps legacy top-level submit responses working", () => {
+		expect(parseSubmitResponse({ success: true, message: "Thanks" })).toEqual({
+			success: true,
+			message: "Thanks",
+		});
+	});
+
+	it("unwraps validation errors returned in the standard API envelope", () => {
+		expect(
+			parseSubmitResponse({
+				data: {
+					errors: [{ field: "email", message: "Email is required" }],
+				},
+			}),
+		).toEqual({ errors: [{ field: "email", message: "Email is required" }] });
+	});
+
+	it("does not recursively unwrap nested envelopes", () => {
+		expect(parseSubmitResponse({ data: { data: { success: true, message: "Nested" } } })).toEqual({
+			data: { success: true, message: "Nested" },
+		});
+	});
+});