diff --git a/src/unittests/unit/client/mixins/display_test.py b/src/unittests/unit/client/mixins/display_test.py
new file mode 100755
index 0000000000..f8e626c9d5
--- /dev/null
+++ b/src/unittests/unit/client/mixins/display_test.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# This file is part of Xpra.
+# Copyright (C) 2019 Antoine Martin <antoine@xpra.org>
+# Xpra is released under the terms of the GNU GPL v2, or, at your option, any
+# later version. See the file COPYING for details.
+
+import os
+import unittest
+
+from xpra.os_util import POSIX, OSX
+from xpra.util import AdHocStruct, typedict
+from unit.client.mixins.clientmixintest_util import ClientMixinTest
+
+
+class DisplayClientTest(ClientMixinTest):
+
+	def test_display(self):
+		if os.environ.get("DISPLAY") and POSIX and not OSX and os.environ.get("GDK_BACKEND", "x11")=="x11":
+			from xpra.x11.gtk_x11.gdk_display_source import init_gdk_display_source
+			init_gdk_display_source()
+		from xpra.client.mixins.display import DisplayClient
+		x = DisplayClient()
+		def get_root_size():
+			return 1024, 768
+		x.get_root_size = get_root_size
+		def get_screen_sizes(*_args):
+			return ((1024, 768),)
+		x.get_screen_sizes = get_screen_sizes
+		opts = AdHocStruct()
+		opts.desktop_fullscreen = False
+		opts.desktop_scaling = False
+		opts.dpi = 144
+		x.init(opts)
+		assert x.get_caps() is not None
+		x.server_capabilities = typedict({
+			"display" : ":999",
+			"desktop_size" : (1024, 768),
+			"max_desktop_size" : (3840, 2160),
+			"actual_desktop_size" : (1024, 768),
+			"resize_screen" : True,
+			})
+		x.parse_server_capabilities()
+
+def main():
+	unittest.main()
+
+
+if __name__ == '__main__':
+	main()