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diff --git a/test/repository/test_answer_repository.py b/test/repository/test_answer_repository.py
new file mode 100644
index 0000000..431ba45
--- /dev/null
+++ b/test/repository/test_answer_repository.py
@@ -0,0 +1,109 @@
+import pytest
+from unittest.mock import MagicMock
+from bson import ObjectId
+from datetime import datetime
+from app.repositories import UserAnswerRepository
+from app.models import UserAnswerEntity
+from app.models.entities import AnswerItemEntity
+
+
+@pytest.fixture
+def mock_db():
+    return MagicMock()
+
+
+@pytest.fixture
+def repository(mock_db):
+    return UserAnswerRepository(db=mock_db)
+
+
+def generate_dummy_answer_entity() -> UserAnswerEntity:
+    return UserAnswerEntity(
+        session_id="session123",
+        quiz_id=str(ObjectId()),
+        user_id="user123",
+        answered_at=datetime.utcnow(),
+        answers=[
+            AnswerItemEntity(
+                question_index=0, answer="B", is_correct=True, time_spent=10
+            )
+        ],
+        total_score=80,
+        total_correct=4,
+    )
+
+
+def test_create(repository):
+    dummy_entity = generate_dummy_answer_entity()
+    insert_result = MagicMock(inserted_id=ObjectId())
+    repository.collection.insert_one.return_value = insert_result
+
+    result = repository.create(dummy_entity)
+
+    repository.collection.insert_one.assert_called_once()
+    assert isinstance(result, str)
+
+
+def test_get_by_id_found(repository):
+    dummy_entity = generate_dummy_answer_entity()
+    data = dummy_entity.model_dump(by_alias=True)
+    data["_id"] = ObjectId()
+
+    repository.collection.find_one.return_value = data
+
+    result = repository.get_by_id(str(data["_id"]))
+
+    assert isinstance(result, UserAnswerEntity)
+    assert result.user_id == dummy_entity.user_id
+    assert result.quiz_id == dummy_entity.quiz_id
+
+
+def test_get_by_id_not_found(repository):
+    repository.collection.find_one.return_value = None
+
+    result = repository.get_by_id(str(ObjectId()))
+
+    assert result is None
+
+
+def test_get_by_user_and_quiz(repository):
+    quiz_id = ObjectId()
+    repository.collection.find.return_value = [
+        {"_id": ObjectId(), "user_id": "u1", "quiz_id": quiz_id}
+    ]
+
+    result = repository.get_by_user_and_quiz("u1", str(quiz_id))
+
+    repository.collection.find.assert_called_once_with(
+        {"user_id": "u1", "quiz_id": quiz_id}
+    )
+    assert isinstance(result, list)
+
+
+def test_get_by_user(repository):
+    dummy_data = [generate_dummy_answer_entity().model_dump(by_alias=True)]
+    repository.collection.find.return_value = dummy_data
+
+    result = repository.get_by_user("user123")
+
+    assert isinstance(result, list)
+    assert all(isinstance(item, UserAnswerEntity) for item in result)
+
+
+def test_get_by_session(repository):
+    session_id = ObjectId()
+    repository.collection.find.return_value = [{"session_id": str(session_id)}]
+
+    result = repository.get_by_session(str(session_id))
+
+    repository.collection.find.assert_called_once_with({"session_id": session_id})
+    assert isinstance(result, list)
+    assert result[0]["session_id"] == str(session_id)
+
+
+def test_delete_by_id(repository):
+    repository.collection.delete_one.return_value = MagicMock(deleted_count=1)
+
+    result = repository.delete_by_id(str(ObjectId()))
+
+    assert result is True
diff --git a/test/repository/test_quiz_repository.py b/test/repository/test_quiz_repository.py
new file mode 100644
index 0000000..8bbdefa
--- /dev/null
+++ b/test/repository/test_quiz_repository.py
@@ -0,0 +1,171 @@
+import pytest
+from unittest.mock import MagicMock
+from bson import ObjectId
+from datetime import datetime
+from app.repositories import QuizRepository
+from app.models.entities import QuizEntity
+
+
+@pytest.fixture
+def mock_db():
+    return MagicMock()
+
+
+@pytest.fixture
+def repository(mock_db):
+    return QuizRepository(db=mock_db)
+
+
+def generate_quiz_entity(**kwargs) -> QuizEntity:
+    return QuizEntity(
+        subject_id=kwargs.get("subject_id", "subject1"),
+        title=kwargs.get("title", "Kuis Sejarah Indonesia"),
+        description=kwargs.get(
+            "description", "Soal mengenai peristiwa penting Indonesia"
+        ),
+        is_public=kwargs.get("is_public", True),
+        date=kwargs.get("date", datetime.now()),
+        total_quiz=kwargs.get("total_quiz", 10),
+        limit_duration=kwargs.get("limit_duration", 30),
+        total_user_playing=kwargs.get("total_user_playing", 100),
+        question_listings=[],
+        author_id=kwargs.get("author_id", "guru123"),
+    )
+
+
+def test_create_quiz(repository):
+    quiz = generate_quiz_entity()
+    insert_result = MagicMock(inserted_id=ObjectId())
+    repository.collection.insert_one.return_value = insert_result
+
+    result = repository.create(quiz)
+
+    repository.collection.insert_one.assert_called_once()
+    assert isinstance(result, str)
+
+
+def test_get_by_id_found(repository):
+    quiz_id = ObjectId()
+    quiz_data = generate_quiz_entity().model_dump(by_alias=True)
+    quiz_data["_id"] = quiz_id
+    repository.collection.find_one.return_value = quiz_data
+
+    result = repository.get_by_id(str(quiz_id))
+
+    assert isinstance(result, QuizEntity)
+    assert result.id == quiz_id
+
+
+def test_get_by_id_not_found(repository):
+    repository.collection.find_one.return_value = None
+
+    result = repository.get_by_id(str(ObjectId()))
+
+    assert result is None
+
+
+def test_search_by_title_or_category(repository):
+    mock_cursor = MagicMock()
+    mock_cursor.skip.return_value = mock_cursor
+    mock_cursor.limit.return_value = [generate_quiz_entity().model_dump(by_alias=True)]
+    repository.collection.find.return_value = mock_cursor
+
+    result = repository.search_by_title_or_category(
+        keyword="Indonesia",
+        subject_id=None,
+        page=1,
+        page_size=10,
+    )
+
+    assert len(result) == 1
+    assert isinstance(result[0], QuizEntity)
+
+
+def test_count_by_search(repository):
+    repository.collection.count_documents.return_value = 3
+
+    result = repository.count_by_search("sejarah")
+
+    assert result == 3
+
+
+def test_get_by_ids(repository):
+    qid1, qid2 = ObjectId(), ObjectId()
+    data = [generate_quiz_entity().model_dump(by_alias=True) for _ in range(2)]
+    data[0]["_id"] = qid1
+    data[1]["_id"] = qid2
+    repository.collection.find.return_value = data
+
+    result = repository.get_by_ids([str(qid1), str(qid2)])
+
+    assert result is not None
+    assert all(isinstance(q, QuizEntity) for q in result)
+
+
+def test_get_by_user_id(repository):
+    mock_cursor = MagicMock()
+    mock_cursor.skip.return_value = mock_cursor
+    mock_cursor.limit.return_value = [generate_quiz_entity().model_dump(by_alias=True)]
+    repository.collection.find.return_value = mock_cursor
+
+    result = repository.get_by_user_id("guru123")
+
+    assert isinstance(result, list)
+    assert isinstance(result[0], QuizEntity)
+
+
+def test_get_all(repository):
+    mock_cursor = MagicMock()
+    mock_cursor.skip.return_value = mock_cursor
+    mock_cursor.limit.return_value = [generate_quiz_entity().model_dump(by_alias=True)]
+    repository.collection.find.return_value = mock_cursor
+
+    result = repository.get_all()
+
+    assert len(result) == 1
+    assert isinstance(result[0], QuizEntity)
+
+
+def test_update(repository):
+    repository.collection.update_one.return_value = MagicMock(modified_count=1)
+
+    result = repository.update(str(ObjectId()), {"title": "Update Title"})
+
+    assert result is True
+
+
+def test_update_user_playing(repository):
+    repository.collection.update_one.return_value = MagicMock(modified_count=1)
+
+    result = repository.update_user_playing(str(ObjectId()), 123)
+
+    assert result is True
+
+
+def test_delete(repository):
+    repository.collection.delete_one.return_value = MagicMock(deleted_count=1)
+
+    result = repository.delete(str(ObjectId()))
+
+    assert result is True
+
+
+def test_count_by_user_id(repository):
+    repository.collection.count_documents.return_value = 7
+
+    result = repository.count_by_user_id("guru123")
+
+    assert result == 7
+
+
+def test_get_top_played_quizzes(repository):
+    mock_cursor = MagicMock()
+    mock_cursor.sort.return_value = mock_cursor
+    mock_cursor.skip.return_value = mock_cursor
+    mock_cursor.limit.return_value = [generate_quiz_entity().model_dump(by_alias=True)]
+    repository.collection.find.return_value = mock_cursor
+
+    result = repository.get_top_played_quizzes()
+
+    assert isinstance(result, list)
+    assert isinstance(result[0], QuizEntity)
diff --git a/test/repository/test_session_repository.py b/test/repository/test_session_repository.py
new file mode 100644
index 0000000..590f411
--- /dev/null
+++ b/test/repository/test_session_repository.py
@@ -0,0 +1,116 @@
+import pytest
+from unittest.mock import MagicMock
+from bson import ObjectId
+from datetime import datetime
+from app.repositories import SessionRepository
+from app.models.entities import SessionEntity
+
+
+@pytest.fixture
+def mock_db():
+    return MagicMock()
+
+
+@pytest.fixture
+def repository(mock_db):
+    return SessionRepository(db=mock_db)
+
+
+def generate_session_entity() -> SessionEntity:
+    return SessionEntity(
+        session_code="ABC123",
+        quiz_id="quiz1",
+        host_id="user1",
+        created_at=datetime.now(),
+        started_at=None,
+        ended_at=None,
+        is_active=True,
+        participan_limit=5,
+        participants=["user1"],
+        current_question_index=0,
+    )
+
+
+def test_insert_session(repository):
+    session = generate_session_entity()
+    insert_result = MagicMock(inserted_id=ObjectId())
+    repository.collection.insert_one.return_value = insert_result
+
+    result = repository.insert(session)
+
+    repository.collection.insert_one.assert_called_once()
+    assert isinstance(result, str)
+
+
+def test_find_by_session_id_found(repository):
+    session = generate_session_entity()
+    doc = session.model_dump(by_alias=True)
+    repository.collection.find_one.return_value = doc
+
+    result = repository.find_by_session_id(session_id=doc["_id"])
+
+    assert isinstance(result, SessionEntity)
+    assert result.session_code == "ABC123"
+
+
+def test_find_by_session_id_not_found(repository):
+    repository.collection.find_one.return_value = None
+
+    result = repository.find_by_session_id("nonexistent_id")
+
+    assert result is None
+
+
+def test_find_by_session_code_found(repository):
+    session = generate_session_entity()
+    doc = session.model_dump(by_alias=True)
+    repository.collection.find_one.return_value = doc
+
+    result = repository.find_by_session_code("ABC123")
+
+    assert isinstance(result, SessionEntity)
+    assert result.quiz_id == "quiz1"
+
+
+def test_update_session(repository):
+    repository.collection.update_one.return_value = MagicMock(modified_count=1)
+
+    update_data = {"is_active": False}
+    result = repository.update("session123", update_data)
+
+    repository.collection.update_one.assert_called_once_with(
+        {"_id": "session123"}, {"$set": update_data}
+    )
+    assert result is True
+
+
+def test_add_participant(repository):
+    repository.collection.update_one.return_value = MagicMock(modified_count=1)
+
+    result = repository.add_participant("session123", "user999")
+
+    repository.collection.update_one.assert_called_once_with(
+        {"_id": "session123"}, {"$addToSet": {"participants": "user999"}}
+    )
+    assert result is True
+
+
+def test_delete_session(repository):
+    repository.collection.delete_one.return_value = MagicMock(deleted_count=1)
+
+    result = repository.delete("session123")
+
+    repository.collection.delete_one.assert_called_once_with({"_id": "session123"})
+    assert result is True
+
+
+def test_list_active_sessions(repository):
+    doc = generate_session_entity().model_dump(by_alias=True)
+    repository.collection.find.return_value = [doc]
+
+    result = repository.list_active_sessions()
+
+    repository.collection.find.assert_called_once_with({"is_active": True})
+    assert len(result) == 1
+    assert isinstance(result[0], SessionEntity)
+    assert result[0].is_active is True
diff --git a/test/repository/test_subject_repository.py b/test/repository/test_subject_repository.py
new file mode 100644
index 0000000..16e5541
--- /dev/null
+++ b/test/repository/test_subject_repository.py
@@ -0,0 +1,139 @@
+import pytest
+from unittest.mock import MagicMock
+from bson import ObjectId
+from app.repositories.subject_repository import SubjectRepository
+from app.models.entities import SubjectEntity
+
+
+@pytest.fixture
+def mock_db():
+    return MagicMock()
+
+
+@pytest.fixture
+def repository(mock_db):
+    return SubjectRepository(db=mock_db)
+
+
+def generate_subject(name, short_name, desc, icon="") -> SubjectEntity:
+    return SubjectEntity(name=name, short_name=short_name, description=desc, icon=icon)
+
+
+def test_create_subject(repository):
+    subject = generate_subject(
+        name="Sejarah Indonesia",
+        short_name="SEJARAH",
+        desc="Mempelajari peristiwa dan tokoh penting dalam sejarah nasional.",
+    )
+    insert_result = MagicMock(inserted_id=ObjectId())
+    repository.collection.insert_one.return_value = insert_result
+
+    result = repository.create(subject)
+
+    repository.collection.insert_one.assert_called_once()
+    assert isinstance(result, str)
+
+
+def test_get_all_subjects(repository):
+    mock_data = [
+        generate_subject(
+            "Biologi",
+            "BIO",
+            "Ilmu yang mempelajari makhluk hidup dan lingkungannya.",
+        ).model_dump(by_alias=True),
+        generate_subject(
+            "Fisika",
+            "FIS",
+            "Mempelajari fenomena alam seperti gaya, energi, dan gerak.",
+        ).model_dump(by_alias=True),
+    ]
+    repository.collection.find.return_value = mock_data
+
+    result = repository.get_all()
+
+    assert len(result) == 2
+    assert result[0].name == "Biologi"
+    assert result[1].short_name == "FIS"
+
+
+def test_get_by_id_valid(repository):
+    oid = ObjectId()
+    doc = generate_subject(
+        "Geografi",
+        "GEO",
+        "Studi tentang lokasi, wilayah, dan interaksi manusia-lingkungan.",
+    ).model_dump(by_alias=True)
+    doc["_id"] = oid
+    repository.collection.find_one.return_value = doc
+
+    result = repository.get_by_id(str(oid))
+
+    assert isinstance(result, SubjectEntity)
+    assert result.name == "Geografi"
+    assert result.id == oid
+
+
+def test_get_by_id_invalid(repository):
+    result = repository.get_by_id("invalid_id")
+    assert result is None
+
+
+def test_get_by_ids_mixed(repository):
+    oid1 = ObjectId()
+    oid2 = ObjectId()
+    ids = [str(oid1), "invalid_id", str(oid2)]
+
+    mock_docs = [
+        {
+            **generate_subject(
+                "Kimia",
+                "KIM",
+                "Ilmu tentang zat dan reaksinya",
+            ).model_dump(by_alias=True),
+            "_id": oid1,
+        },
+        {
+            **generate_subject(
+                "Ekonomi",
+                "EKO",
+                "Analisis produksi, distribusi, dan konsumsi",
+            ).model_dump(by_alias=True),
+            "_id": oid2,
+        },
+    ]
+    repository.collection.find.return_value = mock_docs
+
+    result = repository.get_by_ids(ids)
+
+    assert len(result) == 2
+    assert result[0].short_name == "KIM"
+    assert result[1].name == "Ekonomi"
+
+
+def test_update_valid(repository):
+    oid = ObjectId()
+    repository.collection.update_one.return_value = MagicMock(modified_count=1)
+
+    result = repository.update(str(oid), {"description": "Updated Description"})
+
+    assert result is True
+
+
+def test_update_invalid(repository):
+    result = repository.update("invalid_object_id", {"name": "Something"})
+
+    assert result is False
+
+
+def test_delete_valid(repository):
+    oid = ObjectId()
+    repository.collection.delete_one.return_value = MagicMock(deleted_count=1)
+
+    result = repository.delete(str(oid))
+
+    assert result is True
+
+
+def test_delete_invalid(repository):
+    result = repository.delete("invalid_object_id")
+    assert result is False
diff --git a/test/repository/test_user_repository.py b/test/repository/test_user_repository.py
new file mode 100644
index 0000000..82f8414
--- /dev/null
+++ b/test/repository/test_user_repository.py
@@ -0,0 +1,155 @@
+import pytest
+from unittest.mock import MagicMock
+from bson import ObjectId
+from datetime import datetime
+from app.repositories.user_repository import UserRepository
+from app.models.entities import UserEntity
+
+
+@pytest.fixture
+def mock_db():
+    return MagicMock()
+
+
+@pytest.fixture
+def user_repository(mock_db):
+    return UserRepository(db=mock_db)
+
+
+def test_get_all_users(user_repository):
+    mock_users = [
+        {
+            "_id": ObjectId(),
+            "email": "a@example.com",
+            "name": "A",
+            "password": "pass1",
+            "locale": "id-ID",
+        },
+        {
+            "_id": ObjectId(),
+            "email": "b@example.com",
+            "name": "B",
+            "password": "pass2",
+            "locale": "id-ID",
+        },
+    ]
+    user_repository.collection.find.return_value = mock_users
+
+    result = user_repository.get_all_users()
+
+    assert len(result) == 2
+    assert all(isinstance(user, UserEntity) for user in result)
+    assert result[0].email == "a@example.com"
+    assert result[1].name == "B"
+
+
+def test_get_user_by_email_found(user_repository):
+    mock_user = {
+        "_id": ObjectId(),
+        "email": "john@example.com",
+        "name": "John Doe",
+        "password": "hashed",
+        "birth_date": datetime(2000, 1, 1),
+        "locale": "en-US",
+        "phone": "08123456789",
+    }
+    user_repository.collection.find_one.return_value = mock_user
+
+    result = user_repository.get_user_by_email("john@example.com")
+
+    assert isinstance(result, UserEntity)
+    assert result.email == "john@example.com"
+    assert result.name == "John Doe"
+
+
+def test_get_user_by_email_not_found(user_repository):
+    user_repository.collection.find_one.return_value = None
+
+    result = user_repository.get_user_by_email("notfound@example.com")
+
+    assert result is None
+
+
+def test_get_user_by_id_found(user_repository):
+    user_id = ObjectId()
+    mock_user = {
+        "_id": user_id,
+        "email": "jane@example.com",
+        "name": "Jane",
+        "password": "hashed",
+        "birth_date": datetime(1990, 1, 1),
+        "locale": "en-US",
+        "phone": "089999999",
+    }
+    user_repository.collection.find_one.return_value = mock_user
+
+    result = user_repository.get_user_by_id(str(user_id))
+
+    assert isinstance(result, UserEntity)
+    assert str(result.id) == str(user_id)
+    assert result.name == "Jane"
+
+
+def test_get_by_google_id_found(user_repository):
+    mock_user = {
+        "_id": ObjectId(),
+        "google_id": "google-123",
+        "email": "google@example.com",
+        "name": "Google User",
+        "locale": "en-US",
+    }
+    user_repository.collection.find_one.return_value = mock_user
+
+    result = user_repository.get_by_google_id("google-123")
+
+    assert isinstance(result, UserEntity)
+    assert result.google_id == "google-123"
+    assert result.email == "google@example.com"
+
+
+def test_insert_user(user_repository):
+    user_entity = UserEntity(
+        name="Test",
+        email="test@example.com",
+        password="123",
+        birth_date=datetime(2000, 1, 1),
+        phone="081111111",
+        locale="id-ID",
+    )
+    mock_insert_result = MagicMock(inserted_id=ObjectId())
+    user_repository.collection.insert_one.return_value = mock_insert_result
+
+    result = user_repository.insert_user(user_entity)
+
+    user_repository.collection.insert_one.assert_called_once()
+    assert isinstance(result, str)
+
+
+def test_update_user(user_repository):
+    user_id = str(ObjectId())
+    mock_result = MagicMock(modified_count=1)
+    user_repository.collection.update_one.return_value = mock_result
+
+    result = user_repository.update_user(user_id, {"name": "Updated Name"})
+
+    assert result is True
+
+
+def test_update_user_field(user_repository):
+    user_id = str(ObjectId())
+    mock_result = MagicMock(modified_count=1)
+    user_repository.collection.update_one.return_value = mock_result
+
+    result = user_repository.update_user_field(user_id, "phone", "0822334455")
+
+    assert result is True
+
+
+def test_delete_user(user_repository):
+    user_id = str(ObjectId())
+    mock_result = MagicMock(deleted_count=1)
+    user_repository.collection.delete_one.return_value = mock_result
+
+    result = user_repository.delete_user(user_id)
+
+    assert result is True