diff --git a/testdata/ruby/layPluginTests.rb b/testdata/ruby/layPluginTests.rb
index 41b91c053..245a91e1e 100644
--- a/testdata/ruby/layPluginTests.rb
+++ b/testdata/ruby/layPluginTests.rb
@@ -37,141 +37,152 @@ class PluginFactory < RBA::PluginFactory
   end
 end
 
-class Plugin2EditorOptionsPage < RBA::EditorOptionsPage
-  def initialize
-    super("title", 1)
-  end
-end
+has_qt = RBA.constants.member?(:EditorOptionsPage) && RBA.constants.member?(:MainWindow)
+if has_qt
 
-class Plugin2ConfigPage < RBA::ConfigPage
-  def initialize
-    super("title")
+  class Plugin2EditorOptionsPage < RBA::EditorOptionsPage
+    def initialize
+      super("title", 1)
+    end
   end
-end
 
-class Plugin2 < RBA::Plugin
-  def set_tp(tp)
-    @tp = tp
+  class Plugin2ConfigPage < RBA::ConfigPage
+    def initialize
+      super("title")
+    end
   end
-  def has_tracking_position
-    !!@tp
-  end
-  def tracking_position
-    @tp || RBA::DPoint::new
-  end
-end
 
-class PluginFactory2 < RBA::PluginFactory
-  def initialize()
-    @ep = 0
-    @cp = 0
-    @pi = nil
-    register(1001, "plugin_for_test2", "Plugin2")
+  class Plugin2 < RBA::Plugin
+    def set_tp(tp)
+      @tp = tp
+    end
+    def has_tracking_position
+      !!@tp
+    end
+    def tracking_position
+      @tp || RBA::DPoint::new
+    end
   end
-  def create_plugin(manager, unused, view)
-    @pi = Plugin2::new
-    @pi
-  end
-  def create_editor_options_pages
-    add_editor_options_page(Plugin2EditorOptionsPage::new)
-    @ep += 1
-  end
-  def create_config_pages
-    add_config_page(Plugin2ConfigPage::new)
-    @cp += 1
-  end
-  def pi
-    @pi
-  end
-  def ep
-    @ep
-  end
-  def cp
-    @cp
-  end
-end
 
-class LayPlugin_TestClass < TestBase
+  class PluginFactory2 < RBA::PluginFactory
+    def initialize()
+      @ep = 0
+      @cp = 0
+      @pi = nil
+      register(1001, "plugin_for_test2", "Plugin2")
+    end
+    def create_plugin(manager, unused, view)
+      @pi = Plugin2::new
+      @pi
+    end
+    def create_editor_options_pages
+      add_editor_options_page(Plugin2EditorOptionsPage::new)
+      @ep += 1
+    end
+    def create_config_pages
+      add_config_page(Plugin2ConfigPage::new)
+      @cp += 1
+    end
+    def pi
+      @pi
+    end
+    def ep
+      @ep
+    end
+    def cp
+      @cp
+    end
+  end
 
-  def test_1
+  class LayPlugin_TestClass < TestBase
 
-    assert_equal(RBA::Plugin::AC_Global.to_s, "AC_Global")
-    assert_equal(RBA::Plugin::AC_Any.to_s, "AC_Any")
-    assert_equal(RBA::Plugin::AC_Diagonal.to_s, "AC_Diagonal")
-    assert_equal(RBA::Plugin::AC_Horizontal.to_s, "AC_Horizontal")
-    assert_equal(RBA::Plugin::AC_Vertical.to_s, "AC_Vertical")
-    
-    assert_equal(RBA::Plugin::ac_from_buttons(0), RBA::Plugin::AC_Global)
-    assert_equal(RBA::Plugin::ac_from_buttons(1), RBA::Plugin::AC_Ortho)
-    assert_equal(RBA::Plugin::ac_from_buttons(2), RBA::Plugin::AC_Diagonal)
+    def test_1
 
-    begin
-
-      dpi = PluginFactory::new
-      dpi2 = PluginFactory2::new
+      assert_equal(RBA::Plugin::AC_Global.to_s, "AC_Global")
+      assert_equal(RBA::Plugin::AC_Any.to_s, "AC_Any")
+      assert_equal(RBA::Plugin::AC_Diagonal.to_s, "AC_Diagonal")
+      assert_equal(RBA::Plugin::AC_Horizontal.to_s, "AC_Horizontal")
+      assert_equal(RBA::Plugin::AC_Vertical.to_s, "AC_Vertical")
       
-      # Create a new layout
-      main_window = RBA::MainWindow.instance()
-      main_window.close_all
-      main_window.create_layout(2)
+      assert_equal(RBA::Plugin::ac_from_buttons(0), RBA::Plugin::AC_Global)
+      assert_equal(RBA::Plugin::ac_from_buttons(1), RBA::Plugin::AC_Ortho)
+      assert_equal(RBA::Plugin::ac_from_buttons(2), RBA::Plugin::AC_Diagonal)
 
-      pi = dpi.pi
-      pi2 = dpi2.pi
-      
-      # smoke test
-      pi.grab_mouse
-      pi.ungrab_mouse
-      pi.set_cursor(RBA::Cursor::Wait)
-      pi.add_edge_marker(RBA::DEdge::new)
-      pi.add_mouse_cursor(RBA::DPoint::new)
-      pi.clear_mouse_cursors
+      begin
 
-      # virtual methods
-      assert_equal(pi.has_tracking_position_test, false)
-      pi.clear_mouse_cursors
-      pi.add_mouse_cursor(RBA::DPoint::new(1, 2))
-      assert_equal(pi.has_tracking_position_test, true)
-      assert_equal(pi.tracking_position_test.to_s, "1,2")
-      pi.clear_mouse_cursors
-      assert_equal(pi.has_tracking_position_test, false)
+        dpi = PluginFactory::new
+        dpi2 = PluginFactory2::new
+        
+        # Create a new layout
+        main_window = RBA::MainWindow.instance()
+        main_window.close_all
+        main_window.create_layout(2)
 
-      assert_equal(pi2.has_tracking_position_test, false)
-      pi2.set_tp(RBA::DPoint::new(2, 3))
-      assert_equal(pi2.has_tracking_position_test, true)
-      assert_equal(pi2.tracking_position_test.to_s, "2,3")
-      pi2.set_tp(nil)
-      assert_equal(pi2.has_tracking_position_test, false)
+        pi = dpi.pi
+        pi2 = dpi2.pi
+        
+        # smoke test
+        pi.grab_mouse
+        pi.ungrab_mouse
+        pi.set_cursor(RBA::Cursor::Wait)
+        pi.add_edge_marker(RBA::DEdge::new)
+        pi.add_mouse_cursor(RBA::DPoint::new)
+        pi.clear_mouse_cursors
 
-      assert_equal(dpi2.ep, 1)
-      assert_equal(dpi2.cp, 1)
-      assert_equal(pi2.editor_options_pages.size, 1)
-      assert_equal(pi2.editor_options_pages[0].class.to_s, "Plugin2EditorOptionsPage")
+        # virtual methods
+        assert_equal(pi.has_tracking_position_test, false)
+        pi.clear_mouse_cursors
+        pi.add_mouse_cursor(RBA::DPoint::new(1, 2))
+        assert_equal(pi.has_tracking_position_test, true)
+        assert_equal(pi.tracking_position_test.to_s, "1,2")
+        pi.clear_mouse_cursors
+        assert_equal(pi.has_tracking_position_test, false)
 
-      pi.configure_test("edit-grid", "0.0")
-      assert_equal(pi.snap(RBA::DPoint::new(0.01, 0.02)).to_s, "0.01,0.02")
-      assert_equal(pi.snap(RBA::DVector::new(0.01, 0.02)).to_s, "0.01,0.02")
-      pi.configure_test("edit-grid", "0.1")
-      assert_equal(pi.snap(RBA::DPoint::new(0.11, 0.18)).to_s, "0.1,0.2")
-      assert_equal(pi.snap(RBA::DVector::new(0.11, 0.18)).to_s, "0.1,0.2")
+        assert_equal(pi2.has_tracking_position_test, false)
+        pi2.set_tp(RBA::DPoint::new(2, 3))
+        assert_equal(pi2.has_tracking_position_test, true)
+        assert_equal(pi2.tracking_position_test.to_s, "2,3")
+        pi2.set_tp(nil)
+        assert_equal(pi2.has_tracking_position_test, false)
 
-      pi.configure_test("edit-connect-angle-mode", "ortho")
-      assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), true).to_s, "1.5,2")
-      assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), false).to_s, "1.5,2.1")
-      assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), false, RBA::Plugin::AC_Ortho).to_s, "1.5,2")
+        assert_equal(dpi2.ep, 1)
+        assert_equal(dpi2.cp, 1)
+        assert_equal(pi2.editor_options_pages.size, 1)
+        assert_equal(pi2.editor_options_pages[0].class.to_s, "Plugin2EditorOptionsPage")
 
-      pi.configure_test("edit-connect-angle-mode", "ortho")
-      assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), true).to_s, "0,2.1")
-      assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), false).to_s, "0.5,2.1")
-      assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), false, RBA::Plugin::AC_Ortho).to_s, "0,2.1")
+        pi.configure_test("edit-grid", "0.0")
+        assert_equal(pi.snap(RBA::DPoint::new(0.01, 0.02)).to_s, "0.01,0.02")
+        assert_equal(pi.snap(RBA::DVector::new(0.01, 0.02)).to_s, "0.01,0.02")
+        pi.configure_test("edit-grid", "0.1")
+        assert_equal(pi.snap(RBA::DPoint::new(0.11, 0.18)).to_s, "0.1,0.2")
+        assert_equal(pi.snap(RBA::DVector::new(0.11, 0.18)).to_s, "0.1,0.2")
+
+        pi.configure_test("edit-connect-angle-mode", "ortho")
+        assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), true).to_s, "1.5,2")
+        assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), false).to_s, "1.5,2.1")
+        assert_equal(pi.snap(RBA::DPoint::new(1.5, 2.1), RBA::DPoint::new(1, 2), false, RBA::Plugin::AC_Ortho).to_s, "1.5,2")
+
+        pi.configure_test("edit-connect-angle-mode", "ortho")
+        assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), true).to_s, "0,2.1")
+        assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), false).to_s, "0.5,2.1")
+        assert_equal(pi.snap(RBA::DVector::new(0.5, 2.1), false, RBA::Plugin::AC_Ortho).to_s, "0,2.1")
+
+      ensure
+        main_window.close_all
+        dpi._destroy
+        dpi2._destroy
+      end
 
-    ensure
-      main_window.close_all
-      dpi._destroy
-      dpi2._destroy
     end
 
   end
 
+else
+
+  # at least one test is needed
+  class LayPlugin_TestClass < TestBase
+  end
+
 end
 
 load("test_epilogue.rb")