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apps/web/src/lib/validation/schemas.test.ts

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+import { describe, it, expect } from "vitest";
+import { ValidationError, mapErrorToResponse } from "@/lib/errors";
+import { teacherCreateSchema, normalizeTeacherCreateBody } from "@/lib/validation/schemas";
+
+describe("teacherCreateSchema", () => {
+  it("requires topic", () => {
+    const result = teacherCreateSchema.safeParse({});
+    expect(result.success).toBe(false);
+  });
+
+  it("accepts valid topic", () => {
+    const result = teacherCreateSchema.safeParse({ topic: "Rust ownership" });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts null explorationId", () => {
+    const result = teacherCreateSchema.safeParse({
+      topic: "Rust ownership",
+      explorationId: null,
+    });
+    expect(result.success).toBe(true);
+    if (result.success) {
+      expect(normalizeTeacherCreateBody(result.data).explorationId).toBeUndefined();
+    }
+  });
+});
+
+describe("mapErrorToResponse", () => {
+  it("maps ValidationError to 400", () => {
+    const mapped = mapErrorToResponse(new ValidationError("bad input"));
+    expect(mapped.status).toBe(400);
+    expect(mapped.message).toBe("bad input");
+  });
+
+  it("maps Unauthorized to 401", () => {
+    const mapped = mapErrorToResponse(new Error("Unauthorized"));
+    expect(mapped.status).toBe(401);
+  });
+});