add on_init/on_exit exception tests

tests/test_app_exit_exception.rb

@@ -0,0 +1,36 @@
+# Copyright (c) 2023 M.J.N. Corino, The Netherlands
+#
+# This software is released under the MIT license.
+
+require 'test/unit'
+require 'wx'
+
+class TestApp < Test::Unit::TestCase
+
+  class TestFrame < Wx::Frame
+    def initialize
+      super(nil, -1, '')
+      evt_paint { on_paint }
+    end
+
+    def on_paint
+      paint {}
+      close
+    end
+  end
+
+  class TestApp < Wx::App
+    def on_init
+      TestFrame.new.show
+    end
+
+    def on_exit
+      raise RuntimeError, 'on_exit exception'
+    end
+  end
+
+  def test_self_closing_frame
+    assert_raise_kind_of(RuntimeError) { TestApp.run }
+  end
+
+end

tests/test_app_init_exception.rb

@@ -0,0 +1,20 @@
+# Copyright (c) 2023 M.J.N. Corino, The Netherlands
+#
+# This software is released under the MIT license.
+
+require 'test/unit'
+require 'wx'
+
+class AppInitExitExceptions < Test::Unit::TestCase
+
+  class TestApp < Wx::App
+    def on_init
+      raise RuntimeError, 'on_init exception'
+    end
+  end
+
+  def test_on_init_exception
+    assert_raise_kind_of(RuntimeError) { TestApp.run }
+  end
+
+end