Fix tests

gerbonara/graphic_primitives.py

@@ -23,7 +23,7 @@ from dataclasses import dataclass, KW_ONLY, replace
 
 from .utils import *
 
-prec = lambda x: f'{x:.6}'
+prec = lambda x: f'{float(x):.6}'
 
 
 @dataclass

gerbonara/layers.py

@@ -345,7 +345,7 @@ class LayerStack:
                     layer = LazyCamFile(GerberFile, path)
 
                 if not lazy:
-                    layer = layer.open()
+                    layer = layer.instance
 
                 if key == 'mechanical outline':
                     layers['mechanical', 'outline'] = layer

gerbonara/tests/image_support.py

@@ -172,7 +172,13 @@ def gerber_difference(reference, actual, diff_out=None, svg_transform=None, size
 
         with svg_soup(ref_svg.name) as soup:
             if svg_transform is not None:
-                soup.find('g', attrs={'id': 'surface1'})['transform'] = svg_transform
+                svg = soup.svg
+                children = list(svg.children)
+                g = soup.new_tag('g', attrs={'transform': svg_transform})
+                for c in children:
+                    g.append(c.extract())
+                svg.append(g)
+
             cleanup_gerbv_svg(soup)
 
         with svg_soup(act_svg.name) as soup: