diff --git a/tests/service/test_entry_service.py b/tests/service/test_entry_service.py
new file mode 100644
index 0000000..6cf267c
--- /dev/null
+++ b/tests/service/test_entry_service.py
@@ -0,0 +1,269 @@
+from re import search
+
+import pytest
+from datetime import datetime
+from unittest.mock import Mock
+from sqlalchemy import create_engine
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.orm import sessionmaker
+
+from pilgrim.database import Base
+from pilgrim.models.travel_diary import TravelDiary
+from pilgrim.models.entry import Entry
+from pilgrim.models.photo import Photo
+
+from pilgrim.service.entry_service import EntryService
+
+
+
+@pytest.fixture
+def session_with_an_entry(populated_db_session):
+    session = populated_db_session
+    initial_entry = Entry(
+        title="Título Original",
+        text="Texto original.",
+        date=datetime(2025, 1, 1),
+        travel_diary_id=1
+    )
+    session.add(initial_entry)
+    session.commit()
+    return session, initial_entry.id
+
+@pytest.fixture
+def session_with_multiple_entries(populated_db_session):
+    """Fixture que cria um diário e duas entradas para ele."""
+    session = populated_db_session
+
+    entry1 = Entry(title="Entrada 1", text="Texto 1", date=datetime(2025, 1, 1), travel_diary_id=1)
+    entry2 = Entry(title="Entrada 2", text="Texto 2", date=datetime(2025, 1, 2), travel_diary_id=1)
+
+    session.add_all([entry1, entry2])
+    session.commit()
+
+    return session
+
+def test_create_entry_successfully(populated_db_session):
+    session = populated_db_session
+    service = EntryService(session)
+    diary_id = 1  # Sabemos que o ID é 1 por causa da nossa fixture
+    title = "Primeiro Dia na Praia"
+    text = "O dia foi ensolarado e o mar estava ótimo."
+    date = datetime(2025, 7, 20)
+    photos = [Photo(filepath="/path/to/photo1.jpg",name="Photo 1",photo_hash="hash_12345678",fk_travel_diary_id=diary_id), Photo(filepath="/path/to/photo2.jpg",name="Photo 1",photo_hash="hash_87654321",fk_travel_diary_id=diary_id)]
+    created_entry = service.create(
+        travel_diary_id=diary_id,
+        title=title,
+        text=text,
+        date=date,
+        photos=photos
+    )
+    assert created_entry is not None
+    assert created_entry.id is not None  # Garante que foi salvo no BD e tem um ID
+    assert created_entry.title == title
+    assert created_entry.text == text
+    assert len(created_entry.photos) == 2
+    assert created_entry.photos[0].filepath == "/path/to/photo1.jpg"
+
+    entry_in_db = session.query(Entry).filter_by(id=created_entry.id).one()
+    assert entry_in_db.title == "Primeiro Dia na Praia"
+
+def test_create_entry_fails_when_diary_id_is_invalid(db_session):
+    session = db_session
+    service = EntryService(session)
+    invalid_id = 666
+
+    result = service.create(
+        travel_diary_id=invalid_id,
+        title="Título de Teste",
+        text="Texto de Teste",
+        date=datetime(2025, 7, 20),
+        photos=[]
+    )
+
+    assert result is None
+
+def test_create_entry_successfully_without_photo(populated_db_session):
+    session = populated_db_session
+    service = EntryService(session)
+    diary_id = 1  # Sabemos que o ID é 1 por causa da nossa fixture
+    title = "Primeiro Dia na Praia"
+    text = "O dia foi ensolarado e o mar estava ótimo."
+    date = datetime(2025, 7, 20)
+    photos = []
+    created_entry = service.create(
+        travel_diary_id=diary_id,
+        title=title,
+        text=text,
+        date=date,
+        photos=photos
+    )
+    assert created_entry is not None
+    assert created_entry.id is not None  # Garante que foi salvo no BD e tem um ID
+    assert created_entry.title == title
+    assert created_entry.text == text
+    assert len(created_entry.photos) == 0
+    entry_in_db = session.query(Entry).filter_by(id=created_entry.id).one()
+    assert entry_in_db.title == "Primeiro Dia na Praia"
+
+def test_create_entry_fails_with_null_title(populated_db_session):
+    session = populated_db_session
+    service = EntryService(session)
+    diary_id = 1
+    with pytest.raises(IntegrityError):
+        service.create(
+            travel_diary_id=diary_id,
+            title=None,
+            text="Um texto qualquer.",
+            date=datetime.now(),
+            photos=[]
+        )
+
+def test_create_entry_fails_with_null_date(populated_db_session):
+    session = populated_db_session
+    service = EntryService(session)
+    diary_id = 1
+    with pytest.raises(IntegrityError):
+        service.create(
+            travel_diary_id=diary_id,
+            title="Sabado de sol",
+            text="Um texto qualquer.",
+            date=None,
+            photos=[]
+        )
+
+def test_create_entry_fails_with_null_diary_id(populated_db_session):
+    session = populated_db_session
+    service = EntryService(session)
+    diary_id = 1
+    result = service.create(
+            travel_diary_id=None,
+            title="Sabado de sol",
+            text="Um texto qualquer.",
+            date=datetime.now(),
+            photos=[]
+        )
+    assert result is None
+def test_ready_by_id_successfully(session_with_an_entry):
+    session,_ = session_with_an_entry
+    service = EntryService(session)
+    search_id = 1
+    result = service.read_by_id(search_id)
+    assert result is not None
+def test_ready_by_id_fails_when_id_is_invalid(db_session):
+    session = db_session
+    service = EntryService(session)
+    invalid_id = 666
+    result = service.read_by_id(invalid_id)
+    assert result is None
+
+def test_read_all_returns_all_entries(session_with_multiple_entries):
+    session = session_with_multiple_entries
+    service = EntryService(session)
+    all_entries = service.read_all()
+    assert isinstance(all_entries, list)
+    assert len(all_entries) == 2
+    assert all_entries[0].title == "Entrada 1"
+    assert all_entries[1].title == "Entrada 2"
+
+def test_read_all_returns_empty_list_on_empty_db(db_session):
+    session = db_session
+    service = EntryService(session)
+    all_entries = service.read_all()
+    assert isinstance(all_entries, list)
+    assert len(all_entries) == 0
+
+def test_update_entry_successfully(session_with_an_entry):
+    session, entry_id = session_with_an_entry
+    service = EntryService(session)
+    entry_src = session.query(Entry).filter_by(id=entry_id).one()
+    new_date = datetime(2025, 1, 2)
+    entry_dst = Entry(
+        title="Título Atualizado",
+        text="Texto atualizado.",
+        date=new_date,
+        travel_diary_id=1,  # Mantemos o mesmo travel_diary_id
+        photos=[]
+    )
+    updated_entry = service.update(entry_src, entry_dst)
+    assert updated_entry is not None
+    assert updated_entry.id == entry_id
+    assert updated_entry.title == "Título Atualizado"
+    assert updated_entry.text == "Texto atualizado."
+    entry_in_db = session.query(Entry).filter_by(id=entry_id).one()
+    assert entry_in_db.title == "Título Atualizado"
+
+def test_update_entry_fails_if_entry_does_not_exist(db_session):
+    service = EntryService(db_session)
+    non_existent_entry = Entry(
+        title="dummy",
+        text="dummy",
+        date=datetime.now(),
+        travel_diary_id=1)
+    non_existent_entry.id = 999
+    entry_with_new_data = Entry(title="Novo Título", text="Novo Texto", date=datetime.now(), travel_diary_id=1)
+    result = service.update(non_existent_entry, entry_with_new_data)
+    assert result is None
+
+def test_update_fails_with_null_title(session_with_an_entry):
+    session, entry_id = session_with_an_entry
+    service = EntryService(session)
+    entry_src = session.query(Entry).filter_by(id=entry_id).one()
+    entry_dst = Entry(
+        title=None,
+        text="Texto atualizado.",
+        date=datetime.now(),
+        travel_diary_id=1,
+        photos=[]
+    )
+    with pytest.raises(IntegrityError):
+        service.update(entry_src, entry_dst)
+
+def test_update_fails_with_null_date(session_with_an_entry):
+    session, entry_id = session_with_an_entry
+    service = EntryService(session)
+    entry_src = session.query(Entry).filter_by(id=entry_id).one()
+    entry_dst = Entry(
+        title=entry_src.title,
+        text="Texto atualizado.",
+        date=None,
+        travel_diary_id=1,
+        photos=[]
+    )
+    with pytest.raises(IntegrityError):
+        service.update(entry_src, entry_dst)
+
+def test_update_fails_with_null_diary_id(session_with_an_entry):
+    session, entry_id = session_with_an_entry
+    service = EntryService(session)
+    entry_src = session.query(Entry).filter_by(id=entry_id).one()
+    entry_dst = Entry(
+        title=entry_src.title,
+        text="Texto atualizado.",
+        date=datetime.now(),
+        travel_diary_id=None,
+        photos=[]
+    )
+    with pytest.raises(IntegrityError):
+        service.update(entry_src, entry_dst)
+
+def test_delete_successfully_removes_entry(session_with_an_entry):
+    session, entry_id = session_with_an_entry
+    service = EntryService(session)
+    entry_to_delete = service.read_by_id(entry_id)
+    assert entry_to_delete is not None
+    deleted_entry = service.delete(entry_to_delete)
+    assert deleted_entry is not None
+    assert deleted_entry.id == entry_id
+    entry_in_db = service.read_by_id(entry_id)
+    assert entry_in_db is None
+
+def test_delete_returns_none_if_entry_does_not_exist(db_session):
+    service = EntryService(db_session)
+    non_existent_entry = Entry(
+        title="dummy",
+        text="dummy",
+        date=datetime.now(),
+        travel_diary_id=1)
+    non_existent_entry.id = 999
+    result = service.delete(non_existent_entry)
+    assert result is None