crud tests for subjects, assignments and tasks

__tests__/assignment/createAssignment.test.tsx

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+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import CreateAssignment from "../../app/assignment/createAssignment";
+
+const mockSingle = jest.fn();
+const mockSelect = jest.fn(() => ({ single: mockSingle, }));
+const mockInsert = jest.fn(() => ({ select: mockSelect, }));
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+  useLocalSearchParams: () => ({
+    sId: null,
+  }),
+}));
+
+jest.mock("@/lib/progress", () => ({
+  CheckAssignmentCompletion: jest.fn(),
+}));
+
+jest.mock("@/lib/asyncStorage", () => ({
+  SaveAssignmentNotificationId: jest.fn(),
+}));
+
+jest.mock("expo-notifications", () => ({
+  scheduleNotificationAsync: jest.fn(() => Promise.resolve("notification-123")),
+  SchedulableTriggerInputTypes: {
+    DATE: "date",
+  },
+}));
+
+jest.mock("@/lib/supabase", () => {
+  return {
+    supabase: {
+      auth: {
+        getUser: jest.fn(() =>
+          Promise.resolve({
+            data: { user: { id: "user-123" } },
+            error: null,
+          })
+        ),
+      },
+      from: jest.fn(() => ({
+        insert: mockInsert,
+      })),
+    },
+  };
+});
+
+test("creates an assignment and navigates back", async () => {
+  mockSingle.mockResolvedValue({ 
+    data: { 
+        aId: "assignment-123", title: "create a simple test", deadline: "",
+    },
+    error: null,
+  });
+
+  const screen = render(<CreateAssignment />);
+  fireEvent.changeText(screen.getByTestId("assignment-title-input"), "create a simple test");
+  fireEvent.press(screen.getByTestId("create-assignment-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("assignments");
+    expect(mockInsert).toHaveBeenCalled();
+    expect(router.back).toHaveBeenCalled();
+  });
+});