Add tests and fixture for EventTheme model

Introduce a new pytest fixture for creating EventTheme instances and add comprehensive unit tests covering its properties, relationships, and behaviors. These changes improve test coverage and ensure the EventTheme model functions as expected.

backend/tests/conftest.py

@@ -3,7 +3,8 @@ import pytest
 import uuid
 from app.models.user import User
 from app.utils.test_utils import setup_test_db, teardown_test_db
-from app.models import GiftItem, GiftStatus, GiftPriority, RSVP, RSVPStatus, EventMedia, MediaType, MediaPurpose
+from app.models import GiftItem, GiftStatus, GiftPriority, RSVP, RSVPStatus, EventMedia, MediaType, MediaPurpose, \
+    EventTheme
 
 
 @pytest.fixture(scope="function")
@@ -111,3 +112,29 @@ def event_media_fixture(db_session, mock_user):
     db_session.add(event_media)
     db_session.commit()
     return event_media
+
+
+@pytest.fixture
+def event_theme_fixture(db_session):
+    """
+    Fixture to create and return a default EventTheme instance.
+    """
+    event_theme = EventTheme(
+        id=uuid.uuid4(),
+        name="Animal Theme",
+        description="An animal-themed design for events.",
+        preview_image_url="https://example.com/preview/animal_theme.jpg",
+        color_palette={
+            "primary": "#ff5722",
+            "secondary": "#4caf50",
+            "background": "#ffffff",
+            "text": "#000000"
+        },
+        fonts={
+            "header": "Roboto",
+            "body": "Open Sans"
+        }
+    )
+    db_session.add(event_theme)
+    db_session.commit()
+    return event_theme

backend/tests/models/test_event_theme.py

@@ -0,0 +1,105 @@
+# tests/models/test_event_theme.py
+import uuid
+from app.models.event_theme import EventTheme
+
+
+def test_create_event_theme(db_session):
+    # Arrange
+    event_theme = EventTheme(
+        id=uuid.uuid4(),
+        name="Festive Theme",
+        description="A vibrant and colorful theme for celebrations.",
+        preview_image_url="https://example.com/preview/festive_theme.jpg",
+        color_palette={
+            "primary": "#e91e63",
+            "secondary": "#9c27b0",
+            "background": "#f9f9f9",
+            "text": "#333333"
+        },
+        fonts={
+            "header": "Lora",
+            "body": "Muli"
+        }
+    )
+    db_session.add(event_theme)
+
+    # Act
+    db_session.commit()
+    created_theme = db_session.query(EventTheme).filter_by(id=event_theme.id).first()
+
+    # Assert
+    assert created_theme is not None
+    assert created_theme.name == "Festive Theme"
+    assert created_theme.description == "A vibrant and colorful theme for celebrations."
+    assert created_theme.preview_image_url == "https://example.com/preview/festive_theme.jpg"
+    assert created_theme.color_palette == {
+        "primary": "#e91e63",
+        "secondary": "#9c27b0",
+        "background": "#f9f9f9",
+        "text": "#333333"
+    }
+    assert created_theme.fonts == {
+        "header": "Lora",
+        "body": "Muli"
+    }
+
+
+def test_event_theme_relationship(event_theme_fixture, db_session):
+    # Assert
+    assert event_theme_fixture.events == []  # No events associated yet
+
+
+def test_repr_method(event_theme_fixture):
+    # Act
+    repr_output = repr(event_theme_fixture)
+
+    # Assert
+    assert repr_output == f"<EventTheme {event_theme_fixture.name}>"
+
+
+def test_color_palette_property(event_theme_fixture):
+    # Act
+    color_palette = event_theme_fixture.color_palette
+
+    # Assert
+    assert color_palette == {
+        "primary": "#ff5722",
+        "secondary": "#4caf50",
+        "background": "#ffffff",
+        "text": "#000000"
+    }
+
+    # Update and check
+    event_theme_fixture.color_palette = {
+        "primary": "#0000ff",
+        "secondary": "#00ff00",
+        "background": "#fefefe",
+        "text": "#111111"
+    }
+    assert event_theme_fixture.color_palette == {
+        "primary": "#0000ff",
+        "secondary": "#00ff00",
+        "background": "#fefefe",
+        "text": "#111111"
+    }
+
+
+def test_fonts_property(event_theme_fixture):
+    # Act
+    fonts = event_theme_fixture.fonts
+
+    # Assert
+    assert fonts == {
+        "header": "Roboto",
+        "body": "Open Sans"
+    }
+
+    # Update and check
+    event_theme_fixture.fonts = {
+        "header": "Arial",
+        "body": "Verdana"
+    }
+    assert event_theme_fixture.fonts == {
+        "header": "Arial",
+        "body": "Verdana"
+    }