added tests for multiple choice exercises

gradesa/src/app/api/admin/exercises/multichoice/route.js

@@ -44,14 +44,14 @@ export async function POST(request) {
     let contentOrder = 1;
     for (const item of content) {
       const contentRes = await DB.pool(
-        `INSERT INTO multichoice_content 
+        `INSERT INTO multichoice_content
            (multichoice_exercise_id, content_type, content_value, content_order, correct_answer)
          VALUES ($1, $2, $3, $4, $5)
          RETURNING id`,
         [
           multichoice_id,
           item.type,
-          item.value ?? null,
+          item.value ?? "",
           contentOrder,
           item.type === "multichoice" ? item.correct : null,
         ]

gradesa/src/app/api/admin/exercises/multichoice/route.test.js

@@ -0,0 +1,68 @@
+import { describe, it, expect } from "vitest";
+import { POST } from "./route";
+import { useTestDatabase } from "@/backend/test/testdb";
+import { useTestRequest } from "@/backend/test/mock-request";
+import { TestFactory } from "@/backend/test/testfactory";
+import { DB } from "@/backend/db";
+describe("POST /api/admin/exercises/multichoice", () => {
+  useTestDatabase();
+
+  it("should create a multichoice exercise with valid input", async () => {
+    const admin = await TestFactory.user({ is_admin: true });
+    const { mockPost } = useTestRequest(admin);
+
+    const validInput = {
+      title: "Where is Paris located?",
+      description: "Geography question",
+      content: [
+        {
+          type: "text",
+          value: "Select the country where Paris is located",
+        },
+        {
+          type: "multichoice",
+          value: null,
+          correct: "France",
+          options: ["France", "Germany", "Spain", "Italy"],
+        },
+      ],
+    };
+
+    const response = await POST(
+      mockPost("/api/admin/exercises/multichoice", validInput)
+    );
+
+    expect(response.status).toBe(201);
+    const { exerciseId } = await response.json();
+
+    const exerciseResult = await DB.pool(
+      "SELECT * FROM exercises WHERE id = $1",
+      [exerciseId]
+    );
+    expect(exerciseResult.rows.length).toBe(1);
+
+    const multichoiceExerciseResult = await DB.pool(
+      "SELECT * FROM multichoice_exercises WHERE exercise_id = $1",
+      [exerciseId]
+    );
+    expect(multichoiceExerciseResult.rows.length).toBe(1);
+
+    const content = await DB.pool(
+      "SELECT * FROM multichoice_content WHERE multichoice_exercise_id = $1",
+      [multichoiceExerciseResult.rows[0].id]
+    );
+    expect(content.rows.length).toBe(2);
+
+    const multichoiceContent = content.rows.find(
+      (row) => row.content_type === "multichoice"
+    );
+    expect(multichoiceContent).toBeDefined();
+    expect(multichoiceContent.content_type).toBe("multichoice");
+
+    const options = await DB.pool(
+      "SELECT * FROM multichoice_options WHERE multichoice_content_id = $1",
+      [multichoiceContent.id]
+    );
+    expect(options.rows.length).toBe(4);
+  });
+});