1.0.0

tests/unit/core/test_generation_engine.py

@@ -1027,6 +1027,42 @@ class TestGeneratePreview:
             # The image name contains dimensions
             call_args = mock_bpy.data.images.new.call_args[0]
             assert "128x128" in call_args[0]
+
+    def test_preview_defaults_to_texture_resolution(self):
+        """Preview falls back to full texture dimensions when none provided."""
+        with patch('PIL.Image') as mock_pil_image_module, \
+             patch('PIL.ImageDraw') as mock_pil_imagedraw_module, \
+             patch('PIL.ImageFont') as mock_pil_imagefont_module, \
+             patch('src.core.generation_engine.bpy') as mock_bpy:
+
+            mock_pil_image = MagicMock()
+            mock_pil_image.size = (256, 128)
+            mock_pil_image.getdata.return_value = [(255, 255, 255, 255)] * (256 * 128)
+            mock_pil_image.transpose.return_value = mock_pil_image
+            mock_pil_image_module.new.return_value = mock_pil_image
+            mock_pil_image_module.FLIP_TOP_BOTTOM = 1
+
+            mock_draw = MagicMock()
+            mock_draw.textbbox.return_value = (0, 0, 50, 25)
+            mock_pil_imagedraw_module.Draw.return_value = mock_draw
+
+            mock_font = MagicMock()
+            mock_pil_imagefont_module.load_default.return_value = mock_font
+
+            mock_blender_image = MagicMock()
+            mock_blender_image.pixels = [0.0] * (256 * 128 * 4)
+            mock_bpy.data.images.new.return_value = mock_blender_image
+            mock_bpy.data.images.__contains__.return_value = False
+
+            props = create_mock_props(text="AutoSize")
+            props.texture_width = 256
+            props.texture_height = 128
+
+            result = generate_preview(props)
+
+            assert result is not None
+            call_args = mock_bpy.data.images.new.call_args[0]
+            assert "256x128" in call_args[0]
     
     def test_preview_uses_same_props(self):
         """Test that preview uses same properties as main generation."""