Fix some tests using magics.

For some odd reason, %hist isn't getting loaded into the ipython instance
running the tests.  But by loading it manually, now the tests do run and
pass.  

Similarly, load %clear manually so it can be tested.

IPython/testing/plugin/ipdoctest.py

@@ -207,6 +207,15 b' def start_ipython():'
     _ip.IP.magic_run_ori = _ip.IP.magic_run
     _ip.IP.magic_run = im
 
+    # XXX - For some very bizarre reason, the loading of %history by default is
+    # failing.  This needs to be fixed later, but for now at least this ensures
+    # that tests that use %hist run to completion.
+    from IPython import history
+    history.init_ipython(_ip)
+    if not hasattr(_ip.IP,'magic_history'):
+        raise RuntimeError("Can't load magics, aborting")
+
+
 # The start call MUST be made here.  I'm not sure yet why it doesn't work if
 # it is made later, at plugin initialization time, but in all my tests, that's
 # the case.

IPython/tests/test_magic.py

@@ -25,16 +25,23 b' def test_rehashx():'
     _ip.magic('rehashx')
     # Practically ALL ipython development systems will have more than 10 aliases
 
-    assert len(_ip.IP.alias_table) > 10
+    yield (nt.assert_true, len(_ip.IP.alias_table) > 10)
     for key, val in _ip.IP.alias_table.items():
         # we must strip dots from alias names
-        assert '.' not in key
+        nt.assert_true('.' not in key)
 
     # rehashx must fill up syscmdlist
     scoms = _ip.db['syscmdlist']
-    assert len(scoms) > 10
+    yield (nt.assert_true, len(scoms) > 10)
 
 
+## def doctest_lsmagic():
+##     """
+##     In [15]: %lsmagic
+##     Available magic functions:
+##     %Exit
+## """
+
 def doctest_hist_f():
     """Test %hist -f with temporary filename.
 
@@ -42,7 +49,8 b' def doctest_hist_f():'
 
     In [10]: tfile = tempfile.mktemp('.py','tmp-ipython-')
 
-    In [11]: %history -n -f $tfile 3
+    In [11]: %hist -n -f $tfile 3
+
     """
 
 
@@ -51,9 +59,12 b' def doctest_hist_r():'
 
     XXX - This test is not recording the output correctly.  Not sure why...
 
+    In [20]: 'hist' in _ip.IP.lsmagic()
+    Out[20]: True
+
     In [6]: x=1
 
-    In [7]: hist -n -r 2
+    In [7]: %hist -n -r 2
     x=1  # random
     hist -n -r 2  # random
     """
@@ -94,12 +105,13 b' def test_shist():'
     
 @dec.skipif_not_numpy
 def test_numpy_clear_array_undec():
+    from IPython.Extensions import clearcmd
+
     _ip.ex('import numpy as np')
     _ip.ex('a = np.empty(2)')
-    
-    yield nt.assert_true,'a' in _ip.user_ns
+    yield (nt.assert_true, 'a' in _ip.user_ns)
     _ip.magic('clear array')
-    yield nt.assert_false,'a' in _ip.user_ns
+    yield (nt.assert_false, 'a' in _ip.user_ns)
     
 
 @dec.skip()