Add simple smoketest for clipboard access

IPython/lib/tests/test_clipboard.py

@@ -0,0 +1,20 b''
+import nose.tools as nt
+
+from IPython.core.error import TryNext
+from IPython.lib.clipboard import ClipboardEmpty
+from IPython.utils.py3compat import unicode_type
+
+def test_clipboard_get():
+    # Smoketest for clipboard access - we can't easily guarantee that the
+    # clipboard is accessible and has something on it, but this tries to
+    # exercise the relevant code anyway.
+    try:
+        a = get_ipython().hooks.clipboard_get()
+    except ClipboardEmpty:
+        # Nothing in clipboard to get
+        pass
+    except TryNext:
+        # No clipboard access API available
+        pass
+    else:
+        nt.assert_is_instance(a, unicode_type)