Add comprehensive model tests

- Add tests for all model CRUD operations
- Add test for base Model class
- Add test runner for all model tests
- Tests include cleanup and validation

tests/models/test_group.py

@@ -0,0 +1,61 @@
+from models.group import Group
+import os
+
+def test_group():
+    """Test Group model CRUD operations."""
+    # Clean up any existing test file
+    if os.path.exists("Group.json"):
+        os.remove("Group.json")
+    
+    groups = Group()
+    
+    print("Testing create group")
+    group_id = groups.create("test_group")
+    print(f"Created group with ID: {group_id}")
+    assert group_id is not None
+    assert group_id in groups
+    
+    print("\nTesting read group")
+    group = groups.read(group_id)
+    print(f"Read: {group}")
+    assert group is not None
+    assert group["name"] == "test_group"
+    assert "devices" in group
+    assert "pattern" in group
+    assert "colors" in group
+    
+    print("\nTesting update group")
+    update_data = {
+        "name": "updated_group",
+        "devices": ["device1", "device2"],
+        "pattern": "rainbow",
+        "colors": ["#FF0000", "#00FF00", "#0000FF"],
+        "brightness": 80,
+        "delay": 50
+    }
+    result = groups.update(group_id, update_data)
+    assert result is True
+    updated = groups.read(group_id)
+    assert updated["name"] == "updated_group"
+    assert len(updated["devices"]) == 2
+    assert updated["pattern"] == "rainbow"
+    
+    print("\nTesting list groups")
+    group_list = groups.list()
+    print(f"Group list: {group_list}")
+    assert group_id in group_list
+    
+    print("\nTesting delete group")
+    deleted = groups.delete(group_id)
+    assert deleted is True
+    assert group_id not in groups
+    
+    print("\nTesting read after delete")
+    group = groups.read(group_id)
+    assert group is None
+    
+    print("\nAll group tests passed!")
+
+
+if __name__ == '__main__':
+    test_group()