Add tests for %alias_magic.

IPython/core/tests/test_magic.py

@@ -722,3 +722,22 b' def test_multiple_magics():'
     mm.register(foo2)
     nt.assert_true(mm.magics['line']['foo'].im_self is foo2)
     
+def test_alias_magic():
+    """Test %alias_magic."""
+    ip = get_ipython()
+    mm = ip.magics_manager
+
+    # Basic operation: both cell and line magics are created, if possible.
+    ip.run_line_magic('alias_magic', 'timeit_alias timeit')
+    nt.assert_true('timeit_alias' in mm.magics['line'])
+    nt.assert_true('timeit_alias' in mm.magics['cell'])
+
+    # --cell is specified, line magic not created.
+    ip.run_line_magic('alias_magic', '--cell timeit_cell_alias timeit')
+    nt.assert_false('timeit_cell_alias' in mm.magics['line'])
+    nt.assert_true('timeit_cell_alias' in mm.magics['cell'])
+
+    # Test that line alias is created successfully.
+    ip.run_line_magic('alias_magic', '--line env_alias env')
+    nt.assert_equal(ip.run_line_magic('env', ''),
+                    ip.run_line_magic('env_alias', ''))