crud tests for subjects, assignments and tasks

__tests__/assignment/editAssignment.test.tsx

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+import EditAssignment from "@/app/assignment/editAssignment";
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+
+const mockUpdateSingle = jest.fn();
+const mockUpdateSelect = jest.fn(() => ({ single: mockUpdateSingle, }));
+const mockUpdateEq = jest.fn(() => ({ select: mockUpdateSelect, }));
+const mockUpdate = jest.fn(() => ({ eq: mockUpdateEq, }));
+const mockSingle = jest.fn();
+const mockSelectEq = jest.fn(() => ({ single: mockSingle, }));
+const mockSelect = jest.fn(() => ({ eq: mockSelectEq, }));
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+  useLocalSearchParams: () => ({
+    aId: "assignment-123",
+  }),
+  useFocusEffect: (callback: () => void) => callback(),
+}));
+
+jest.mock("@/lib/progress", () => ({
+  CheckAssignmentCompletion: jest.fn(),
+}));
+
+jest.mock("@/lib/asyncStorage", () => ({
+  GetAssignmentNotificationId: jest.fn(() => Promise.resolve(null)),
+}));
+
+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(() => ({
+        select: mockSelect,
+        update: mockUpdate,
+      })),
+    },
+  };
+});
+
+test("updates an assignment and navigates back", async () => {
+  mockSingle.mockResolvedValue({ 
+    data: {
+        aId: "assignment-123", 
+        title: "create a simple test",
+        uId: "user-123",
+        deadline: "2026-04-25",
+    },
+    error: null,
+  });
+  mockUpdateSingle.mockResolvedValue({
+    data: {
+        aId: "assignment-123", 
+        title: "create a harder test",
+        uId: "user-123",
+        deadline: "2026-04-25",
+    },
+    error: null,
+  });
+
+  const screen = render(<EditAssignment />);
+  fireEvent.changeText(await screen.findByTestId("assignment-title-input"), "create a harder test");
+  fireEvent.press(screen.getByTestId("edit-assignment-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("assignments");
+    expect(mockSelect).toHaveBeenCalled();
+    expect(mockUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        title: "create a harder test",
+        uId: "user-123",
+        deadline: "2026-04-25",
+      })
+    );
+    expect(mockUpdateSingle).toHaveBeenCalled();
+    expect(router.back).toHaveBeenCalled();
+  });
+});