Add test code for history session offset.

IPython/core/tests/test_history.py

@@ -30,11 +30,11 b' def test_history():'
             ip.history_manager = HistoryManager(ip)
             ip.history_manager.hist_file = histfile
             print 'test',histfile
-            hist = ['a=1\n', 'def f():\n    test = 1\n    return test\n', 'b=2\n']
+            hist = ['a=1', 'def f():\n    test = 1\n    return test', 'b=2']
             # test save and load
             ip.history_manager.input_hist_raw[:] = []
             for h in hist:
-                ip.history_manager.input_hist_raw.append(h)
+                ip.history_manager.store_inputs(h)
             ip.save_history()
             ip.history_manager.input_hist_raw[:] = []
             ip.reload_history()
@@ -43,6 +43,23 b' def test_history():'
             nt.assert_equal(len(ip.history_manager.input_hist_raw), len(hist))
             for i,h in enumerate(hist):
                 nt.assert_equal(hist[i], ip.history_manager.input_hist_raw[i])
+              
+            # Test that session offset works.
+            ip.history_manager.session_offset = \
+                                    len(ip.history_manager.input_hist_raw) -1
+            newcmds = ["z=5","class X(object):\n    pass", "k='p'"]
+            for cmd in newcmds:
+                ip.history_manager.store_inputs(cmd)
+            gothist = ip.history_manager.get_history((1,4),
+                                                        raw=True, output=False)
+            nt.assert_equal(gothist, dict(zip([1,2,3], newcmds)))
+            
+            # Cross testing: check that magic %save picks up on the session
+            # offset.
+            testfilename = os.path.realpath(os.path.join(tmpdir, "test.py"))
+            ip.magic_save(testfilename + " 1-3")
+            testfile = open(testfilename, "r")
+            nt.assert_equal(testfile.read(), "\n".join(newcmds))
         finally:
             # Restore history manager
             ip.history_manager = hist_manager_ori