add pymongo to iptest exclusions

IPython/testing/iptest.py

@@ -105,6 +105,7 b" have['wx'] = test_for('wx')"
 have['wx.aui'] = test_for('wx.aui')
 have['pexpect'] = test_for('pexpect')
 have['zmq'] = test_for('zmq', '2.0.10')
+have['pymongo'] = test_for('pymongo')
 
 #-----------------------------------------------------------------------------
 # Functions and classes
@@ -187,6 +188,9 b' def make_exclude():'
         exclusions.append(ipjoin('zmq'))
         exclusions.append(ipjoin('parallel'))
 
+    if not have['pymongo']:
+        exclusions.append(ipjoin('parallel', 'controller', 'mongodb'))
+
     # This is needed for the reg-exp to match on win32 in the ipdoctest plugin.
     if sys.platform == 'win32':
         exclusions = [s.replace('\\','\\\\') for s in exclusions]