tweak the fit of the parts

test/package_builder_test.rb

@@ -68,6 +68,30 @@ class PackageBuilderTest < Minitest::Test
     end
   end
 
+  def test_builds_aligned_multicolor_lid_package_when_artwork_is_enabled
+    Dir.mktmpdir do |directory|
+      root = Pathname(directory)
+      tools = create_fake_tools(root)
+      model = root.join("model.scad")
+      renderer = root.join("renderer.py")
+      File.write(model, "cube([1,1,1]);\n")
+      File.write(renderer, "# test renderer\n")
+      config = FeatherCaseWizard::Config.create(name: "IMU", slug: "imu")
+      config.parameters["lid_label"] = "IMU"
+      config.parameters["lid_logo_enabled"] = true
+
+      destination = build(config, root.join("cases"), tools, model, renderer)
+
+      %w[lid lid_base lid_accent].each do |part|
+        assert destination.join("exports/3mf/#{part}.3mf").file?
+      end
+      assert destination.join("exports/3mf/lid_multicolor.3mf").file?
+      assert destination.join("source/assets/NME-fixed.svg").file?
+      assert destination.join("tools/package_multimaterial_3mf.py").file?
+      assert destination.join("previews/lid_multicolor_top.png").file?
+    end
+  end
+
   private
 
   def build(config, root, tools, model, renderer)
@@ -93,14 +117,26 @@ class PackageBuilderTest < Minitest::Test
       #!/usr/bin/env ruby
       require "fileutils"
       args = ARGV[(ARGV.index("--") + 1)..]
-      _mesh, output, basename, selected = args
-      views = selected ? selected.split(",") : %w[iso front back left right top]
+      multicolor = ARGV[ARGV.index("--python") + 1].include?("render_multicolor")
+      if multicolor
+        _base, _accent, output, basename = args
+        views = %w[iso top]
+      else
+        _mesh, output, basename, selected = args
+        views = selected ? selected.split(",") : %w[iso front back left right top]
+      end
       FileUtils.mkdir_p(output)
       views.each { |view| File.binwrite(File.join(output, "\#{basename}_\#{view}.png"), "png") }
     RUBY
-    FileUtils.chmod(0o755, [openscad, blender])
+    python = bin.join("python3")
+    File.write(python, <<~RUBY)
+      #!/usr/bin/env ruby
+      File.binwrite(ARGV[3], "multipart")
+    RUBY
+    FileUtils.chmod(0o755, [openscad, blender, python])
     FeatherCaseWizard::Toolchain.new(
-      env: {"PATH" => bin.to_s, "OPENSCAD" => openscad.to_s, "BLENDER" => blender.to_s}
+      env: {"PATH" => bin.to_s, "OPENSCAD" => openscad.to_s,
+            "BLENDER" => blender.to_s, "PYTHON" => python.to_s}
     )
   end
 end