diff --git a/Address-Book/test_AddressbookCreateTask.py.invalid b/Address-Book/test_AddressbookCreateTask.py.invalid
new file mode 100644
index 0000000000..ebdca76f2b
--- /dev/null
+++ b/Address-Book/test_AddressbookCreateTask.py.invalid
@@ -0,0 +1,97 @@
+import pytest
+from unittest.mock import patch, MagicMock
+from tkinter import Toplevel, Label, Button
+from Address-Book.addressbook import create_task, onClickAdded
+
+@pytest.fixture
+def mock_tkinter():
+    with patch('Address-Book.addressbook.Toplevel') as mock_toplevel, \
+         patch('Address-Book.addressbook.Label') as mock_label, \
+         patch('Address-Book.addressbook.Button') as mock_button:
+        yield mock_toplevel, mock_label, mock_button
+
+@pytest.fixture
+def mock_database():
+    with patch('Address-Book.addressbook.conn') as mock_conn:
+        mock_cursor = MagicMock()
+        mock_conn.cursor.return_value = mock_cursor
+        yield mock_conn, mock_cursor
+
+@pytest.mark.valid
+def test_create_task_with_valid_inputs(mock_tkinter, mock_database):
+    mock_toplevel, mock_label, mock_button = mock_tkinter
+    mock_conn, mock_cursor = mock_database
+
+    with patch('Address-Book.addressbook.Name.get', return_value='John Doe'), \
+         patch('Address-Book.addressbook.Number.get', return_value='1234567890'), \
+         patch('Address-Book.addressbook.list_of_names', []):
+        
+        result = create_task()
+        
+        onClickAdded.assert_called_once()
+        mock_cursor.execute.assert_called_once_with(''' INSERT INTO tasks(name,status_id) VALUES(?,?) ''', ('John Doe', '1234567890'))
+        mock_conn.commit.assert_called_once()
+        assert result == mock_cursor.lastrowid
+
+@pytest.mark.invalid
+def test_create_task_with_empty_name(mock_tkinter, mock_database):
+    mock_toplevel, mock_label, mock_button = mock_tkinter
+    mock_conn, mock_cursor = mock_database
+
+    with patch('Address-Book.addressbook.Name.get', return_value=''), \
+         patch('Address-Book.addressbook.Number.get', return_value='1234567890'):
+        
+        create_task()
+        
+        mock_toplevel.assert_called_once()
+        mock_label.assert_called_once_with(mock_toplevel(), text="NAME IS EMPTY\n")
+        mock_button.assert_called_once_with(mock_toplevel(), text=' Back ', command=mock_toplevel().destroy)
+        mock_cursor.execute.assert_not_called()
+
+@pytest.mark.invalid
+def test_create_task_with_invalid_phone_number_length(mock_tkinter, mock_database):
+    mock_toplevel, mock_label, mock_button = mock_tkinter
+    mock_conn, mock_cursor = mock_database
+
+    with patch('Address-Book.addressbook.Name.get', return_value='John Doe'), \
+         patch('Address-Book.addressbook.Number.get', return_value='12345'), \
+         patch('Address-Book.addressbook.list_of_names', []):
+        
+        create_task()
+        
+        mock_toplevel.assert_called_once()
+        mock_label.assert_called_once_with(mock_toplevel(), text="Phone no should be 10  digits\n")
+        mock_button.assert_called_once_with(mock_toplevel(), text=' Back ', command=mock_toplevel().destroy)
+        mock_cursor.execute.assert_not_called()
+
+@pytest.mark.invalid
+def test_create_task_with_duplicate_name(mock_tkinter, mock_database):
+    mock_toplevel, mock_label, mock_button = mock_tkinter
+    mock_conn, mock_cursor = mock_database
+
+    with patch('Address-Book.addressbook.Name.get', return_value='John Doe'), \
+         patch('Address-Book.addressbook.Number.get', return_value='1234567890'), \
+         patch('Address-Book.addressbook.list_of_names', ['John Doe']):
+        
+        create_task()
+        
+        mock_toplevel.assert_called_once()
+        mock_label.assert_called_once_with(mock_toplevel(), text="John Doe  Already Exist\n")
+        mock_button.assert_called_once_with(mock_toplevel(), text=' Back ', command=mock_toplevel().destroy)
+        mock_cursor.execute.assert_not_called()
+
+@pytest.mark.invalid
+def test_create_task_with_empty_phone_number(mock_tkinter, mock_database):
+    mock_toplevel, mock_label, mock_button = mock_tkinter
+    mock_conn, mock_cursor = mock_database
+
+    with patch('Address-Book.addressbook.Name.get', return_value='John Doe'), \
+         patch('Address-Book.addressbook.Number.get', return_value=''), \
+         patch('Address-Book.addressbook.list_of_names', []):
+        
+        create_task()
+        
+        mock_toplevel.assert_called_once()
+        mock_label.assert_called_once_with(mock_toplevel(), text="Phone no should be 10  digits\n")
+        mock_button.assert_called_once_with(mock_toplevel(), text=' Back ', command=mock_toplevel().destroy)
+        mock_cursor.execute.assert_not_called()
diff --git a/Address-Book/test_AddressbookOnClickAdded.py.invalid b/Address-Book/test_AddressbookOnClickAdded.py.invalid
new file mode 100644
index 0000000000..1ed5c59616
--- /dev/null
+++ b/Address-Book/test_AddressbookOnClickAdded.py.invalid
@@ -0,0 +1,73 @@
+import pytest
+from unittest.mock import patch
+from tkinter import StringVar
+import tkinter.messagebox
+from Address-Book.addressbook import onClickAdded
+
+class Test_AddressbookOnClickAdded:
+
+    @pytest.fixture(autouse=True)
+    def setup(self):
+        global Name
+        Name = StringVar()
+
+    @pytest.mark.valid
+    def test_successful_addition_message_display(self):
+        # Arrange
+        Name.set("John Doe")
+        
+        with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+            # Act
+            onClickAdded()
+            
+            # Assert
+            mock_showinfo.assert_called_once_with(" ", "John Doe got added")
+
+    @pytest.mark.invalid
+    def test_empty_name_input_handling(self):
+        # Arrange
+        Name.set("")
+        
+        with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+            # Act
+            onClickAdded()
+            
+            # Assert
+            mock_showinfo.assert_called_once_with(" ", " got added")
+
+    @pytest.mark.regression
+    def test_message_box_title(self):
+        # Arrange
+        Name.set("Sample Name")
+        
+        with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+            # Act
+            onClickAdded()
+            
+            # Assert
+            mock_showinfo.assert_called_once_with(" ", "Sample Name got added")
+
+    @pytest.mark.valid
+    def test_special_characters_in_name(self):
+        # Arrange
+        Name.set("John@Doe!")
+        
+        with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+            # Act
+            onClickAdded()
+            
+            # Assert
+            mock_showinfo.assert_called_once_with(" ", "John@Doe! got added")
+
+    @pytest.mark.performance
+    def test_long_name_input(self):
+        # Arrange
+        long_name = "A" * 256  # TODO: Adjust the length if needed
+        Name.set(long_name)
+        
+        with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+            # Act
+            onClickAdded()
+            
+            # Assert
+            mock_showinfo.assert_called_once_with(" ", f"{long_name} got added")
diff --git a/Address-Book/test_AddressbookOnClickDeleted.py.invalid b/Address-Book/test_AddressbookOnClickDeleted.py.invalid
new file mode 100644
index 0000000000..cf64858184
--- /dev/null
+++ b/Address-Book/test_AddressbookOnClickDeleted.py.invalid
@@ -0,0 +1,58 @@
+import pytest
+from unittest.mock import patch
+from tkinter import Tk, StringVar
+import tkinter.messagebox
+from Address-Book.addressbook import onClickDeleted
+
+@pytest.fixture
+def setup_tkinter_env():
+    root = Tk()
+    root.geometry('600x370')
+    name_var = StringVar()
+    return root, name_var
+
+@pytest.mark.valid
+def test_message_box_display_with_valid_name(setup_tkinter_env):
+    root, name_var = setup_tkinter_env
+    name_var.set("John Doe")
+    
+    with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+        onClickDeleted()
+        mock_showinfo.assert_called_once_with(" ", "John Doe got deleted")
+
+@pytest.mark.invalid
+def test_message_box_display_with_empty_name(setup_tkinter_env):
+    root, name_var = setup_tkinter_env
+    name_var.set("")
+    
+    with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+        onClickDeleted()
+        mock_showinfo.assert_called_once_with(" ", " got deleted")
+
+@pytest.mark.valid
+def test_message_box_display_with_special_characters(setup_tkinter_env):
+    root, name_var = setup_tkinter_env
+    name_var.set("@John!")
+    
+    with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+        onClickDeleted()
+        mock_showinfo.assert_called_once_with(" ", "@John! got deleted")
+
+@pytest.mark.valid
+def test_message_box_display_with_long_name(setup_tkinter_env):
+    root, name_var = setup_tkinter_env
+    long_name = "A" * 101  # TODO: Adjust the length if needed
+    name_var.set(long_name)
+    
+    with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+        onClickDeleted()
+        mock_showinfo.assert_called_once_with(" ", f"{long_name} got deleted")
+
+@pytest.mark.invalid
+def test_message_box_display_with_non_string_input(setup_tkinter_env):
+    root, name_var = setup_tkinter_env
+    name_var.set(12345)  # Non-string input
+    
+    with patch('tkinter.messagebox.showinfo') as mock_showinfo:
+        onClickDeleted()
+        mock_showinfo.assert_called_once_with(" ", "12345 got deleted")
diff --git a/requirements-roost.txt b/requirements-roost.txt
new file mode 100644
index 0000000000..55b033e901
--- /dev/null
+++ b/requirements-roost.txt
@@ -0,0 +1 @@
+pytest
\ No newline at end of file