add test_magic, with single test (for rehashx)

IPython/tests/test_magic.py

@@ -0,0 +1,21 b''
+""" Tests for various magic functions
+
+Needs to be run by nose (to make ipython session available)
+
+"""
+def test_rehashx():
+    # clear up everything
+    _ip.IP.alias_table.clear()
+    del _ip.db['syscmdlist']
+    
+    _ip.magic('rehashx')
+    # Practically ALL ipython development systems will have more than 10 aliases
+
+    assert 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
+
+    # rehashx must fill up syscmdlist
+    scoms = _ip.db['syscmdlist']
+    assert len(scoms) > 10