crud tests for subjects, assignments and tasks

__tests__/assignment/createAssignment.test.tsx

@@ -0,0 +1,73 @@
+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();
+  });
+});

__tests__/assignment/deleteAssignment.test.tsx

@@ -0,0 +1,110 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import { Alert } from "react-native";
+import ViewDetailsAssignment from "../../app/assignment/viewDetailsAssignment";
+
+const mockSingleAssignment = jest.fn();
+const mockSelectAssignmentEq = jest.fn(() => ({ single: mockSingleAssignment, }));
+const mockSelectAssignment = jest.fn(() => ({ eq: mockSelectAssignmentEq, }));
+const mockSelectTasksEq = jest.fn();
+const mockSelectTasks = jest.fn(() => ({ eq: mockSelectTasksEq }));
+const mockDeleteAssignmentEq = jest.fn();
+const mockDeleteAssignment = jest.fn(() => ({ eq: mockDeleteAssignmentEq, }));
+
+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/supabase", () => {
+  return {
+    supabase: {
+      auth: {
+        getUser: jest.fn(() =>
+          Promise.resolve({
+            data: { user: { uId: "user-123" } },
+            error: null,
+          })
+        ),
+        getSession: jest.fn(() =>
+          Promise.resolve({
+            data: {
+              session: {
+                user: { uId: "user-123" },
+              },
+            },
+          })
+        ),
+        onAuthStateChange: jest.fn(() => ({
+          data: {
+            subscription: {
+              unsubscribe: jest.fn(),
+            },
+          },
+        })),
+      },
+      from: jest.fn((table) => {
+        if (table === "assignments") {
+          return {
+            select: mockSelectAssignment,
+            delete: mockDeleteAssignment,
+          };
+        }
+
+        if (table === "tasks") {
+          return {
+            select: mockSelectTasks,
+          };
+        }
+
+        return {};
+      }),
+    },
+  };
+});
+
+const alertSpy = jest.spyOn(Alert, "alert");
+
+test("deletes a task and navigates back", async () => {
+  mockSingleAssignment.mockResolvedValue({ 
+    data: { 
+      aId: "assignment-123",
+      title: "create a simple test",
+      uId: "user-123",
+    },
+    error: null,
+  });
+  mockSelectTasksEq.mockResolvedValue({ data: [], error: null, })
+  mockDeleteAssignmentEq.mockResolvedValue({ error: null, });
+
+  const screen = render(<ViewDetailsAssignment />);
+  fireEvent.press(await screen.findByTestId("delete-assignment-button"));
+
+  expect(alertSpy).toHaveBeenCalledWith(
+    "Delete Assignment",
+    "Are you sure you want to delete this assignment?",
+    expect.any(Array),
+  );
+
+  const alertButtons = alertSpy.mock.calls[0][2];
+  const confirmDeleteButton = alertButtons[1];
+
+  await confirmDeleteButton.onPress();    
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("assignments");
+    expect(mockDeleteAssignment).toHaveBeenCalled();
+    expect(mockDeleteAssignmentEq).toHaveBeenCalledWith("aId", "assignment-123");
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/assignment/editAssignment.test.tsx

@@ -0,0 +1,99 @@
+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();
+  });
+});

__tests__/subject/createSubject.test.tsx

@@ -0,0 +1,48 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import CreateSubject from "../../app/subject/createSubject";
+
+const mockInsert = jest.fn();
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+}));
+
+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 a subject and navigates back", async () => {
+  mockInsert.mockResolvedValue({ error: null });
+
+  const screen = render(<CreateSubject />);
+  fireEvent.changeText(screen.getByTestId("subject-title-input"), "ikt205g26v");
+  fireEvent.press(screen.getByTestId("create-subject-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("subjects");
+    expect(mockInsert).toHaveBeenCalled();
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/subject/deleteSubject.test.tsx

@@ -0,0 +1,111 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import { Alert } from "react-native";
+import ViewDetailsSubject from "../../app/subject/viewDetailsSubject";
+
+const mockSingleSubject = jest.fn();
+const mockSelectSubjectEq = jest.fn(() => ({ single: mockSingleSubject, }));
+const mockSelectSubject = jest.fn(() => ({ eq: mockSelectSubjectEq, }));
+const mockOrderAssignments = jest.fn();
+const mockSelectAssignmentsEq = jest.fn(() => ({ order: mockOrderAssignments }));
+const mockSelectAssignments = jest.fn(() => ({ eq: mockSelectAssignmentsEq }));
+const mockDeleteSubjectEq = jest.fn();
+const mockDeleteSubject = jest.fn(() => ({ eq: mockDeleteSubjectEq, }));
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+  useLocalSearchParams: () => ({
+    sId: "subject-123",
+  }),
+  useFocusEffect: (callback: () => void) => callback(),
+}));
+
+jest.mock("@/lib/supabase", () => {
+  return {
+    supabase: {
+      auth: {
+        getUser: jest.fn(() =>
+          Promise.resolve({
+            data: { user: { uId: "user-123" } },
+            error: null,
+          })
+        ),
+        getSession: jest.fn(() =>
+          Promise.resolve({
+            data: {
+              session: {
+                user: { uId: "user-123" },
+              },
+            },
+          })
+        ),
+        onAuthStateChange: jest.fn(() => ({
+          data: {
+            subscription: {
+              unsubscribe: jest.fn(),
+            },
+          },
+        })),
+      },
+      from: jest.fn((table) => {
+        if (table === "subjects") {
+          return {
+            select: mockSelectSubject,
+            delete: mockDeleteSubject,
+          };
+        }
+
+        if (table === "assignments") {
+          return {
+            select: mockSelectAssignments,
+          };
+        }
+
+        return {};
+      }),
+    },
+  };
+});
+
+const alertSpy = jest.spyOn(Alert, "alert");
+
+test("deletes a subject and navigates back", async () => {
+  mockSingleSubject.mockResolvedValue({ 
+    data: { 
+      sId: "subject-123",
+      title: "ikt205g26v",
+      uId: "user-123",
+    },
+    error: null,
+  });
+  mockOrderAssignments.mockResolvedValue({ data: [], error: null, })
+  mockDeleteSubjectEq.mockResolvedValue({ error: null, });
+
+  const screen = render(<ViewDetailsSubject />);
+  fireEvent.press(await screen.findByTestId("delete-subject-button"));
+
+  expect(alertSpy).toHaveBeenCalledWith(
+    "Delete Subject",
+    "Are you sure you want to delete this subject?",
+    expect.any(Array),
+  );
+
+  const alertButtons = alertSpy.mock.calls[0][2];
+  const confirmDeleteButton = alertButtons[1];
+
+  await confirmDeleteButton.onPress();    
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("subjects");
+    expect(mockDeleteSubject).toHaveBeenCalled();
+    expect(mockDeleteSubjectEq).toHaveBeenCalledWith("sId", "subject-123");
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/subject/editSubject.test.tsx

@@ -0,0 +1,72 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import EditSubject from "../../app/subject/editSubject";
+
+const mockUpdateEq = jest.fn();
+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: () => ({
+    sId: "subject-123",
+  }),
+  useFocusEffect: (callback: () => void) => callback(),
+}));
+
+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 a subject and navigates back", async () => {
+  mockSingle.mockResolvedValue({ 
+    data: { 
+        sId: "subject-123",
+        title: "ikt205g26v",
+        uId: "user-123",
+    },
+    error: null,
+  });
+  mockUpdateEq.mockResolvedValue({ error: null, });
+
+  const screen = render(<EditSubject />);
+  fireEvent.changeText(await screen.findByTestId("subject-title-input"), "ikt206g26v");
+  fireEvent.press(screen.getByTestId("edit-subject-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("subjects");
+    expect(mockSelect).toHaveBeenCalled();
+    expect(mockUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        title: "ikt206g26v",
+        uId: "user-123",
+      })
+    );
+    expect(mockUpdateEq).toHaveBeenCalledWith("sId", "subject-123");
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/task/createTask.test.tsx

@@ -0,0 +1,55 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import CreateTask from "../../app/task/createTask";
+
+const mockInsert = jest.fn();
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+  useLocalSearchParams: () => ({
+    aId: null,
+  }),
+}));
+
+jest.mock("@/lib/progress", () => ({
+  CheckAssignmentCompletion: jest.fn(),
+}));
+
+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 a task and navigates back", async () => {
+  mockInsert.mockResolvedValue({ error: null });
+
+  const screen = render(<CreateTask />);
+  fireEvent.changeText(screen.getByTestId("task-title-input"), "Read chapter 4");
+  fireEvent.press(screen.getByTestId("create-task-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("tasks");
+    expect(mockInsert).toHaveBeenCalled();
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/task/deleteTask.test.tsx

@@ -0,0 +1,97 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import { Alert } from "react-native";
+import ViewDetailsTask from "../../app/task/viewDetailsTask";
+
+const mockSingleTask = jest.fn();
+const mockSelectTaskEq = jest.fn(() => ({ single: mockSingleTask, }));
+const mockSelectTask = jest.fn(() => ({ eq: mockSelectTaskEq, }));
+const mockDeleteTaskEq = jest.fn();
+const mockDeleteTask = jest.fn(() => ({ eq: mockDeleteTaskEq, }));
+
+jest.mock("expo-router", () => ({
+  router: {
+    back: jest.fn(),
+    replace: jest.fn(),
+  },
+  Stack: {
+    Screen: () => null,
+  },
+  useLocalSearchParams: () => ({
+    tId: "task-123",
+  }),
+  useFocusEffect: (callback: () => void) => callback(),
+}));
+
+jest.mock("@/lib/supabase", () => {
+  return {
+    supabase: {
+      auth: {
+        getUser: jest.fn(() =>
+          Promise.resolve({
+            data: { user: { uId: "user-123" } },
+            error: null,
+          })
+        ),
+        getSession: jest.fn(() =>
+          Promise.resolve({
+            data: {
+              session: {
+                user: { uId: "user-123" },
+              },
+            },
+          })
+        ),
+        onAuthStateChange: jest.fn(() => ({
+          data: {
+            subscription: {
+              unsubscribe: jest.fn(),
+            },
+          },
+        })),
+      },
+      from: jest.fn(() => {
+        return {
+          select: mockSelectTask,
+          delete: mockDeleteTask,
+        };
+      }),
+    },
+  };
+});
+
+const alertSpy = jest.spyOn(Alert, "alert");
+
+test("deletes a task and navigates back", async () => {
+  mockSingleTask.mockResolvedValue({ 
+    data: { 
+      tId: "task-123",
+      title: "Read chapter 4",
+      uId: "user-123",
+    },
+    error: null,
+  });
+  mockDeleteTaskEq.mockResolvedValue({ error: null, });
+
+  const screen = render(<ViewDetailsTask />);
+  fireEvent.press(await screen.findByTestId("delete-task-button"));
+
+  expect(alertSpy).toHaveBeenCalledWith(
+    "Delete Task",
+    "Are you sure you want to delete this task?",
+    expect.any(Array),
+  );
+
+  const alertButtons = alertSpy.mock.calls[0][2];
+  const confirmDeleteButton = alertButtons[1];
+
+  await confirmDeleteButton.onPress();    
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("tasks");
+    expect(mockDeleteTask).toHaveBeenCalled();
+    expect(mockDeleteTaskEq).toHaveBeenCalledWith("tId", "task-123");
+    expect(router.back).toHaveBeenCalled();
+  });
+});

__tests__/task/editTask.test.tsx

@@ -0,0 +1,76 @@
+import { supabase } from "@/lib/supabase";
+import { fireEvent, render, waitFor } from "@testing-library/react-native";
+import { router } from "expo-router";
+import EditTask from "../../app/task/editTask";
+
+const mockUpdateEq = jest.fn();
+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: () => ({
+    tId: "task-123",
+  }),
+  useFocusEffect: (callback: () => void) => callback(),
+}));
+
+jest.mock("@/lib/progress", () => ({
+  CheckAssignmentCompletion: jest.fn(),
+}));
+
+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 a task and navigates back", async () => {
+  mockSingle.mockResolvedValue({ 
+    data: {
+        tId: "task-123", 
+        title: "Read chapter 4",
+        uId: "user-123",
+    },
+    error: null,
+  });
+  mockUpdateEq.mockResolvedValue({ error: null, });
+
+  const screen = render(<EditTask />);
+  fireEvent.changeText(await screen.findByTestId("task-title-input"), "Read chapter 5");
+  fireEvent.press(screen.getByTestId("edit-task-button"));
+
+  await waitFor(() => {
+    expect(supabase.from).toHaveBeenCalledWith("tasks");
+    expect(mockSelect).toHaveBeenCalled();
+    expect(mockUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        title: "Read chapter 5",
+        uId: "user-123",
+      })
+    );
+    expect(mockUpdateEq).toHaveBeenCalledWith("tId", "task-123");
+    expect(router.back).toHaveBeenCalled();
+  });
+});

app.json

@@ -1,7 +1,7 @@
 {
   "expo": {
     "name": "Study-Sprint",
-    "slug": "Study-Sprint",
+    "slug": "study-sprint",
     "version": "1.0.0",
     "orientation": "portrait",
     "icon": "./assets/images/icon.png",
@@ -49,8 +49,9 @@
     "extra": {
       "router": {},
       "eas": {
-        "projectId": "25652385-934a-4a29-8fa7-deff3281e03e"
+        "projectId": "d9e26d91-0f0c-4b97-b11a-20be2916e9f3"
       }
-    }
+    },
+    "owner": "ikt205g26v-g18"
   }
 }

app/assignment/createAssignment.tsx

@@ -153,6 +153,7 @@ export default function CreateAssignment() {
               <View className="mb-5">
                 <Text className={labelClassName}>Title</Text>
                 <TextInput
+                  testID = "assignment-title-input"
                   className={inputClassName}
                   placeholder="Enter assignment title"
                   value={title}
@@ -219,6 +220,7 @@ export default function CreateAssignment() {
               </Pressable>
 
               <Pressable
+                testID = "create-assignment-button"
                 className={`h-14 items-center justify-center rounded-2xl ${
                   isSaving ? 'bg-accent-disabled' : 'bg-accent'
                 }`}

app/assignment/editAssignment.tsx

@@ -149,6 +149,7 @@ export default function EditAssignment() {
             <TouchableWithoutFeedback onPress={Keyboard.dismiss}>
               <View style={defaultStyles.container}>
                 <TextInput
+                  testID="assignment-title-input"
                   style={defaultStyles.inputText}
                   placeholder="Title"
                   value={assignment.title}
@@ -176,7 +177,7 @@ export default function EditAssignment() {
                   <Text style={defaultStyles.checkboxLabel}>{assignment.isCompleted ? 'Completed' : 'Not Completed'}</Text>
                 </Pressable>
 
-                <Button title={isSaving ? "Saving..." : "Save"} onPress={EditAssignment} disabled={isSaving} />
+                <Button testID="edit-assignment-button" title={isSaving ? "Saving..." : "Save"} onPress={EditAssignment} disabled={isSaving} />
                 {isSaving && (
                   <ActivityIndicator size="large" />
                 )}

app/assignment/viewDetailsAssignment.tsx

@@ -198,7 +198,7 @@ export default function ViewDetailsAssignment() {
             </View>
 
             <Button title="Edit" onPress={() => router.push({pathname: "/assignment/editAssignment", params: { aId: assignment.aId }})} />
-            <Button title="Delete" onPress={() => DeleteAssignment(assignment.aId)} />
+            <Button testID = "delete-assignment-button" title="Delete" onPress={() => DeleteAssignment(assignment.aId)} />
           </View>
 
           <View style={defaultStyles.buttonContainer}>
@@ -224,7 +224,7 @@ export default function ViewDetailsAssignment() {
                   {isOwner && (
                     <View style={defaultStyles.buttonContainer}>
                       <Button title="Edit" onPress={() => router.push({pathname: "/task/editTask", params: { tId: item.tId }})} />
-                      <Button title="Delete" onPress={() => DeleteTask(item.tId, item.tId)} />
+                      <Button title="Delete" onPress={() => DeleteTask(item.tId, item.aId)} />
                     </View>
                   )}
                 </View>

app/subject/createSubject.tsx

@@ -103,6 +103,7 @@ export default function CreateSubject() {
               <View className="mb-5">
                 <Text className={labelClassName}>Title</Text>
                 <TextInput
+                  testID="subject-title-input"
                   className={inputClassName}
                   placeholder="Enter subject title"
                   value={title}
@@ -157,6 +158,7 @@ export default function CreateSubject() {
               </Pressable>
 
               <Pressable
+                testID="create-subject-button"
                 className={`h-14 items-center justify-center rounded-2xl ${
                   isSaving ? 'bg-accent-disabled' : 'bg-accent'
                 }`}

app/subject/editSubject.tsx

@@ -88,6 +88,7 @@ export default function EditSubject() {
             <TouchableWithoutFeedback onPress={Keyboard.dismiss}>
               <View style={defaultStyles.container}>
                 <TextInput
+                  testID="subject-title-input"
                   style={defaultStyles.inputText}
                   placeholder="Title"
                   value={subject.title}
@@ -109,7 +110,7 @@ export default function EditSubject() {
                   <Text style={defaultStyles.checkboxLabel}>{subject.isActive ? 'Active' : 'inactive'}</Text>
                 </Pressable>
 
-                <Button title={isSaving ? "Saving..." : "Save"} onPress={EditSubject} disabled={isSaving} />
+                <Button testID="edit-subject-button" title={isSaving ? "Saving..." : "Save"} onPress={EditSubject} disabled={isSaving} />
                 {isSaving && (
                   <ActivityIndicator size="large" />
                 )}

app/subject/viewDetailsSubject.tsx

@@ -186,7 +186,7 @@ export default function ViewDetailsSubject() {
             </View>
 
             <Button title="Edit" onPress={() => router.push({pathname: "/subject/editSubject", params: { sId: subject.sId }})} />
-            <Button title="Delete" onPress={() => DeleteSubject(subject.sId)} />
+            <Button testID = "delete-subject-button" title="Delete" onPress={() => DeleteSubject(subject.sId)} />
 
             <View style={defaultStyles.buttonContainer}>
               <Button title="Create Assignment" onPress={() => router.push({pathname: "/assignment/createAssignment", params: { sId: subject.sId }})} />

app/task/createTask.tsx

@@ -115,6 +115,7 @@ export default function CreateTask() {
               <View className="mb-5">
                 <Text className={labelClassName}>Title</Text>
                 <TextInput
+                  testID="task-title-input"
                   className={inputClassName}
                   placeholder="Enter task title"
                   value={title}
@@ -169,6 +170,7 @@ export default function CreateTask() {
               </Pressable>
 
               <Pressable
+                testID="create-task-button"
                 className={`h-14 items-center justify-center rounded-2xl ${
                   isSaving ? 'bg-accent-disabled' : 'bg-accent'
                 }`}

app/task/editTask.tsx

@@ -98,6 +98,7 @@ export default function EditTask() {
             <TouchableWithoutFeedback onPress={Keyboard.dismiss}>
               <View style={defaultStyles.container}>
                 <TextInput
+                  testID="task-title-input"
                   style={defaultStyles.inputText}
                   placeholder="Title"
                   value={task.title}
@@ -119,7 +120,7 @@ export default function EditTask() {
                   <Text style={defaultStyles.checkboxLabel}>{task.isCompleted ? 'Completed' : 'Not Completed'}</Text>
                 </Pressable>
 
-                <Button title={isSaving ? "Saving..." : "Save"} onPress={EditTask} disabled={isSaving} />
+                <Button testID="edit-task-button" title={isSaving ? "Saving..." : "Save"} onPress={EditTask} disabled={isSaving} />
                 {isSaving && (
                   <ActivityIndicator size="large" />
                 )}

app/task/viewDetailsTask.tsx

@@ -119,7 +119,7 @@ export default function ViewDetailsTask() {
 
           <View style={defaultStyles.buttonContainer}>
             <Button title="Edit" onPress={() => router.push({pathname: "/task/editTask", params: { tId: task.tId }})} />
-            <Button title="Delete" onPress={() => DeleteTask(task.tId)} />
+            <Button testID = "delete-task-button" title="Delete" onPress={() => DeleteTask(task.tId)} />
           </View>
         </View>
       )}

notes/work-report-2026-04-24-to-25.md

@@ -0,0 +1,71 @@
+# CRUD Testing Summary (React Native + Jest + Supabase)
+
+## What these tests are about
+Tests verify **app behavior**, not Supabase itself.
+
+They check:
+- User interaction works
+- Correct database functions are called
+- Navigation happens after actions
+
+---
+
+## CRUD Breakdown
+
+### CREATE
+- User inputs data
+- `insert()` is called
+- App navigates back
+
+Flow:
+User → type → press create → insert() → router.back()
+
+---
+
+### READ
+- Data is fetched (`select().eq().single()`)
+- State updates
+- UI renders correct content
+
+---
+
+### UPDATE
+- Existing data is loaded
+- User edits input
+- `update().eq()` is called with correct values
+- Navigation happens
+
+---
+
+### DELETE
+- User presses delete
+- `Alert.alert()` is triggered
+- Confirm button (`onPress`) is manually called in test
+- `delete().eq()` runs
+- Navigation happens
+
+---
+
+## Why mocking is used
+- No real database calls
+- Faster tests
+- Full control over success/error cases
+- No side effects (no real data created/deleted)
+
+---
+
+## Mock rule
+The mock must match the real call chain:
+
+Real:
+from → update → eq → select → single
+
+Mock:
+from() → update() → eq() → select() → single()
+
+If not → errors like:
+".select is not a function"
+
+---
+
+https://oss.callstack.com/react-native-testing-library/

package.json

@@ -8,7 +8,8 @@
     "android": "expo start --android",
     "ios": "expo start --ios",
     "web": "expo start --web",
-    "lint": "expo lint"
+    "lint": "expo lint",
+    "test": "jest"
   },
   "dependencies": {
     "@expo/vector-icons": "^15.0.3",
@@ -45,12 +46,20 @@
     "react-native-worklets": "0.5.1"
   },
   "devDependencies": {
+    "@testing-library/react-native": "^13.3.3",
+    "@types/jest": "^30.0.0",
     "@types/react": "~19.1.0",
     "eslint": "^9.25.0",
     "eslint-config-expo": "~10.0.0",
+    "jest": "^29.7.0",
+    "jest-expo": "^55.0.16",
     "patch-package": "^8.0.1",
+    "react-test-renderer": "19.1.0",
     "tailwindcss": "^3.4.19",
     "typescript": "~5.9.2"
   },
-  "private": true
-}
+  "private": true,
+  "jest": {
+    "preset": "jest-expo"
+  }
+}