Add test for disabling history manager

IPython/core/tests/test_history.py

@@ -1,188 +1,211
 # coding: utf-8
 """Tests for the IPython tab-completion machinery.
 """
 #-----------------------------------------------------------------------------
 # Module imports
 #-----------------------------------------------------------------------------
 
 # stdlib
 import io
 import os
 import sys
 import tempfile
 from datetime import datetime
 
 # third party
 import nose.tools as nt
 
 # our own packages
 from traitlets.config.loader import Config
 from IPython.utils.tempdir import TemporaryDirectory
 from IPython.core.history import HistoryManager, extract_hist_ranges
 from IPython.utils import py3compat
 
 def setUp():
     nt.assert_equal(sys.getdefaultencoding(), "utf-8" if py3compat.PY3 else "ascii")
 
 def test_history():
     ip = get_ipython()
     with TemporaryDirectory() as tmpdir:
         hist_manager_ori = ip.history_manager
         hist_file = os.path.join(tmpdir, 'history.sqlite')
         try:
             ip.history_manager = HistoryManager(shell=ip, hist_file=hist_file)
             hist = [u'a=1', u'def f():\n    test = 1\n    return test', u"b='€Æ¾÷ß'"]
             for i, h in enumerate(hist, start=1):
                 ip.history_manager.store_inputs(i, h)
 
             ip.history_manager.db_log_output = True
             # Doesn't match the input, but we'll just check it's stored.
             ip.history_manager.output_hist_reprs[3] = "spam"
             ip.history_manager.store_output(3)
 
             nt.assert_equal(ip.history_manager.input_hist_raw, [''] + hist)
             
             # Detailed tests for _get_range_session
             grs = ip.history_manager._get_range_session
             nt.assert_equal(list(grs(start=2,stop=-1)), list(zip([0], [2], hist[1:-1])))
             nt.assert_equal(list(grs(start=-2)), list(zip([0,0], [2,3], hist[-2:])))
             nt.assert_equal(list(grs(output=True)), list(zip([0,0,0], [1,2,3], zip(hist, [None,None,'spam']))))
 
             # Check whether specifying a range beyond the end of the current
             # session results in an error (gh-804)
             ip.magic('%hist 2-500')
             
             # Check that we can write non-ascii characters to a file
             ip.magic("%%hist -f %s" % os.path.join(tmpdir, "test1"))
             ip.magic("%%hist -pf %s" % os.path.join(tmpdir, "test2"))
             ip.magic("%%hist -nf %s" % os.path.join(tmpdir, "test3"))
             ip.magic("%%save %s 1-10" % os.path.join(tmpdir, "test4"))
 
             # New session
             ip.history_manager.reset()
             newcmds = [u"z=5",
                        u"class X(object):\n    pass",
                        u"k='p'",
                        u"z=5"]
             for i, cmd in enumerate(newcmds, start=1):
                 ip.history_manager.store_inputs(i, cmd)
             gothist = ip.history_manager.get_range(start=1, stop=4)
             nt.assert_equal(list(gothist), list(zip([0,0,0],[1,2,3], newcmds)))
             # Previous session:
             gothist = ip.history_manager.get_range(-1, 1, 4)
             nt.assert_equal(list(gothist), list(zip([1,1,1],[1,2,3], hist)))
 
             newhist = [(2, i, c) for (i, c) in enumerate(newcmds, 1)]
 
             # Check get_hist_tail
             gothist = ip.history_manager.get_tail(5, output=True,
                                                     include_latest=True)
             expected = [(1, 3, (hist[-1], "spam"))] \
                 + [(s, n, (c, None)) for (s, n, c) in newhist]
             nt.assert_equal(list(gothist), expected)
 
             gothist = ip.history_manager.get_tail(2)
             expected = newhist[-3:-1]
             nt.assert_equal(list(gothist), expected)
 
             # Check get_hist_search
             gothist = ip.history_manager.search("*test*")
             nt.assert_equal(list(gothist), [(1,2,hist[1])] )
 
             gothist = ip.history_manager.search("*=*")
             nt.assert_equal(list(gothist),
                             [(1, 1, hist[0]),
                              (1, 2, hist[1]),
                              (1, 3, hist[2]),
                              newhist[0],
                              newhist[2],
                              newhist[3]])
 
             gothist = ip.history_manager.search("*=*", n=4)
             nt.assert_equal(list(gothist),
                             [(1, 3, hist[2]),
                              newhist[0],
                              newhist[2],
                              newhist[3]])
 
             gothist = ip.history_manager.search("*=*", unique=True)
             nt.assert_equal(list(gothist),
                             [(1, 1, hist[0]),
                              (1, 2, hist[1]),
                              (1, 3, hist[2]),
                              newhist[2],
                              newhist[3]])
 
             gothist = ip.history_manager.search("*=*", unique=True, n=3)
             nt.assert_equal(list(gothist),
                             [(1, 3, hist[2]),
                              newhist[2],
                              newhist[3]])
 
             gothist = ip.history_manager.search("b*", output=True)
             nt.assert_equal(list(gothist), [(1,3,(hist[2],"spam"))] )
 
             # Cross testing: check that magic %save can get previous session.
             testfilename = os.path.realpath(os.path.join(tmpdir, "test.py"))
             ip.magic("save " + testfilename + " ~1/1-3")
             with io.open(testfilename, encoding='utf-8') as testfile:
                 nt.assert_equal(testfile.read(),
                                         u"# coding: utf-8\n" + u"\n".join(hist)+u"\n")
 
             # Duplicate line numbers - check that it doesn't crash, and
             # gets a new session
             ip.history_manager.store_inputs(1, "rogue")
             ip.history_manager.writeout_cache()
             nt.assert_equal(ip.history_manager.session_number, 3)
         finally:
             # Ensure saving thread is shut down before we try to clean up the files
             ip.history_manager.save_thread.stop()
             # Forcibly close database rather than relying on garbage collection
             ip.history_manager.db.close()
             # Restore history manager
             ip.history_manager = hist_manager_ori
 
 
 def test_extract_hist_ranges():
     instr = "1 2/3 ~4/5-6 ~4/7-~4/9 ~9/2-~7/5 ~10/"
     expected = [(0, 1, 2),  # 0 == current session
                 (2, 3, 4),
                 (-4, 5, 7),
                 (-4, 7, 10),
                 (-9, 2, None),  # None == to end
                 (-8, 1, None),
                 (-7, 1, 6),
                 (-10, 1, None)]
     actual = list(extract_hist_ranges(instr))
     nt.assert_equal(actual, expected)
 
 def test_magic_rerun():
     """Simple test for %rerun (no args -> rerun last line)"""
     ip = get_ipython()
     ip.run_cell("a = 10", store_history=True)
     ip.run_cell("a += 1", store_history=True)
     nt.assert_equal(ip.user_ns["a"], 11)
     ip.run_cell("%rerun", store_history=True)
     nt.assert_equal(ip.user_ns["a"], 12)
 
 def test_timestamp_type():
     ip = get_ipython()
     info = ip.history_manager.get_session_info()
     nt.assert_true(isinstance(info[1], datetime))
 
 def test_hist_file_config():
     cfg = Config()
     tfile = tempfile.NamedTemporaryFile(delete=False)
     cfg.HistoryManager.hist_file = tfile.name
     try:
         hm = HistoryManager(shell=get_ipython(), config=cfg)
         nt.assert_equal(hm.hist_file, cfg.HistoryManager.hist_file)
     finally:
         try:
             os.remove(tfile.name)
         except OSError:
             # same catch as in testing.tools.TempFileMixin
             # On Windows, even though we close the file, we still can't
             # delete it.  I have no clue why
             pass
 
+def test_histmanager_disabled():
+    """Ensure that disabling the history manager doesn't create a database."""
+    cfg = Config()
+    cfg.HistoryAccessor.enabled = False
+
+    ip = get_ipython()
+    with TemporaryDirectory() as tmpdir:
+        hist_manager_ori = ip.history_manager
+        hist_file = os.path.join(tmpdir, 'history.sqlite')
+        cfg.HistoryManager.hist_file = hist_file
+        try:
+            ip.history_manager = HistoryManager(shell=ip, config=cfg)
+            hist = [u'a=1', u'def f():\n    test = 1\n    return test', u"b='€Æ¾÷ß'"]
+            for i, h in enumerate(hist, start=1):
+                ip.history_manager.store_inputs(i, h)
+            nt.assert_equal(ip.history_manager.input_hist_raw, [''] + hist)
+            ip.history_manager.reset()
+            ip.history_manager.end_session()
+        finally:
+            ip.history_manager = hist_manager_ori
+
+    # hist_file should not be created
+    nt.assert_false(os.path.exists(hist_file))