diff --git a/backend/tests/models/test_rsvp.py b/backend/tests/models/test_rsvp.py
new file mode 100644
index 0000000..9b99dbe
--- /dev/null
+++ b/backend/tests/models/test_rsvp.py
@@ -0,0 +1,106 @@
+# tests/models/test_rsvp.py
+import uuid
+from datetime import datetime, timedelta, timezone
+from app.models.rsvp import RSVP, RSVPStatus
+
+
+def test_create_rsvp(db_session):
+    # Arrange
+    rsvp = RSVP(
+        id=uuid.uuid4(),
+        event_id=uuid.uuid4(),
+        guest_id=uuid.uuid4(),
+        status=RSVPStatus.NOT_ATTENDING,
+        number_of_guests=1,
+        response_message="Sorry, can't make it.",
+        dietary_requirements="None",
+    )
+    db_session.add(rsvp)
+
+    # Act
+    db_session.commit()
+    created_rsvp = db_session.query(RSVP).filter_by(id=rsvp.id).first()
+
+    # Assert
+    assert created_rsvp is not None
+    assert created_rsvp.status == RSVPStatus.NOT_ATTENDING
+    assert created_rsvp.number_of_guests == 1
+    assert created_rsvp.dietary_requirements == "None"
+
+
+def test_update_rsvp_status(rsvp_fixture, db_session):
+    # Act
+    rsvp_fixture.update_status(new_status=RSVPStatus.MAYBE, guests_count=3)
+    db_session.commit()
+
+    # Assert
+    assert rsvp_fixture.status == RSVPStatus.MAYBE
+    assert rsvp_fixture.number_of_guests == 3
+
+    # Check last_updated is approximately now
+    assert rsvp_fixture.last_updated >= datetime.now(timezone.utc) - timedelta(seconds=1)
+
+
+def test_is_attending(rsvp_fixture):
+    # Act
+    is_attending = rsvp_fixture.is_attending
+
+    # Assert
+    assert is_attending is True  # By default RSVPStatus.ATTENDING is set in the fixture
+
+    # Update RSVP to NOT_ATTENDING and verify
+    rsvp_fixture.status = RSVPStatus.NOT_ATTENDING
+    assert rsvp_fixture.is_attending is False
+
+
+def test_unique_rsvp_constraint(db_session):
+    # Arrange
+    event_id = uuid.uuid4()
+    guest_id = uuid.uuid4()
+
+    rsvp1 = RSVP(
+        id=uuid.uuid4(),
+        event_id=event_id,
+        guest_id=guest_id,
+        status=RSVPStatus.ATTENDING,
+        number_of_guests=2,
+    )
+    db_session.add(rsvp1)
+    db_session.commit()
+
+    # Attempt to create another RSVP for the same event and guest
+    rsvp2 = RSVP(
+        id=uuid.uuid4(),
+        event_id=event_id,
+        guest_id=guest_id,
+        status=RSVPStatus.NOT_ATTENDING,
+        number_of_guests=1,
+    )
+    db_session.add(rsvp2)
+
+    # Act and Assert
+    try:
+        db_session.commit()
+        # If no exception is raised, the test should fail
+        assert False, "Expected IntegrityError for duplicate RSVP"
+    except Exception as e:
+        # Check the exception to confirm it matches SQLite's UNIQUE constraint error
+        error_message = str(e)
+        if "sqlite3.IntegrityError" in error_message:
+            assert "UNIQUE constraint failed: rsvps.event_id, rsvps.guest_id" in error_message
+        else:
+            # For other databases (e.g., PostgreSQL), the constraint name should appear
+            assert "uq_event_guest_rsvp" in error_message
+
+
+
+def test_dietary_requirements(rsvp_fixture):
+    # Act
+    dietary = rsvp_fixture.dietary_requirements
+
+    # Assert
+    assert dietary == "Vegetarian"
+
+    # Update and re-check
+    rsvp_fixture.dietary_requirements = "No preference"
+    assert rsvp_fixture.dietary_requirements == "No preference"
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