Use AssertPrints in test_magic.

IPython/core/tests/test_magic.py

@@ -1,461 +1,454 b''
 """Tests for various magic functions.
 
 Needs to be run by nose (to make ipython session available).
 """
 from __future__ import absolute_import
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import os
 import sys
 import tempfile
 import types
 from StringIO import StringIO
 
 import nose.tools as nt
 
 from IPython.utils.path import get_long_path_name
 from IPython.testing import decorators as dec
 from IPython.testing import tools as tt
 from IPython.utils import py3compat
 
 #-----------------------------------------------------------------------------
 # Test functions begin
 #-----------------------------------------------------------------------------
 def test_rehashx():
     # clear up everything
     _ip = get_ipython()
     _ip.alias_manager.alias_table.clear()
     del _ip.db['syscmdlist']
     
     _ip.magic('rehashx')
     # Practically ALL ipython development systems will have more than 10 aliases
 
     yield (nt.assert_true, len(_ip.alias_manager.alias_table) > 10)
     for key, val in _ip.alias_manager.alias_table.iteritems():
         # we must strip dots from alias names
         nt.assert_true('.' not in key)
 
     # rehashx must fill up syscmdlist
     scoms = _ip.db['syscmdlist']
     yield (nt.assert_true, len(scoms) > 10)
 
 
 def test_magic_parse_options():
     """Test that we don't mangle paths when parsing magic options."""
     ip = get_ipython()
     path = 'c:\\x'
     opts = ip.parse_options('-f %s' % path,'f:')[0]
     # argv splitting is os-dependent
     if os.name == 'posix':
         expected = 'c:x'
     else:
         expected = path
     nt.assert_equals(opts['f'], expected)
 
     
 def doctest_hist_f():
     """Test %hist -f with temporary filename.
 
     In [9]: import tempfile
 
     In [10]: tfile = tempfile.mktemp('.py','tmp-ipython-')
 
     In [11]: %hist -nl -f $tfile 3
 
     In [13]: import os; os.unlink(tfile)
     """
 
 
 def doctest_hist_r():
     """Test %hist -r
 
     XXX - This test is not recording the output correctly.  For some reason, in
     testing mode the raw history isn't getting populated.  No idea why.
     Disabling the output checking for now, though at least we do run it.
 
     In [1]: 'hist' in _ip.lsmagic()
     Out[1]: True
 
     In [2]: x=1
 
     In [3]: %hist -rl 2
     x=1 # random
     %hist -r 2
     """
 
 def doctest_hist_op():
     """Test %hist -op
 
     In [1]: class b(float):
        ...:     pass
        ...: 
 
     In [2]: class s(object):
        ...:     def __str__(self):
        ...:         return 's'
        ...: 
 
     In [3]: 
 
     In [4]: class r(b):
        ...:     def __repr__(self):
        ...:         return 'r'
        ...: 
 
     In [5]: class sr(s,r): pass
        ...: 
 
     In [6]: 
 
     In [7]: bb=b()
 
     In [8]: ss=s()
 
     In [9]: rr=r()
 
     In [10]: ssrr=sr()
 
     In [11]: 4.5
     Out[11]: 4.5
 
     In [12]: str(ss)
     Out[12]: 's'
 
     In [13]: 
 
     In [14]: %hist -op
     >>> class b:
     ...     pass
     ... 
     >>> class s(b):
     ...     def __str__(self):
     ...         return 's'
     ... 
     >>> 
     >>> class r(b):
     ...     def __repr__(self):
     ...         return 'r'
     ... 
     >>> class sr(s,r): pass
     >>> 
     >>> bb=b()
     >>> ss=s()
     >>> rr=r()
     >>> ssrr=sr()
     >>> 4.5
     4.5
     >>> str(ss)
     's'
     >>> 
     """
   
 def test_macro():
     ip = get_ipython()
     ip.history_manager.reset()   # Clear any existing history.
     cmds = ["a=1", "def b():\n  return a**2", "print(a,b())"]
     for i, cmd in enumerate(cmds, start=1):
         ip.history_manager.store_inputs(i, cmd)
     ip.magic("macro test 1-3")
     nt.assert_equal(ip.user_ns["test"].value, "\n".join(cmds)+"\n")
     
     # List macros.
     assert "test" in ip.magic("macro")
 
 def test_macro_run():
     """Test that we can run a multi-line macro successfully."""
     ip = get_ipython()
     ip.history_manager.reset()
     cmds = ["a=10", "a+=1", py3compat.doctest_refactor_print("print a"),
                                                             "%macro test 2-3"]
     for cmd in cmds:
         ip.run_cell(cmd)
     nt.assert_equal(ip.user_ns["test"].value,
                             py3compat.doctest_refactor_print("a+=1\nprint a\n"))
-    original_stdout = sys.stdout
-    new_stdout = StringIO()
-    sys.stdout = new_stdout
-    try:
+    with tt.AssertPrints("12"):
         ip.run_cell("test")
-        nt.assert_true("12" in new_stdout.getvalue())
+    with tt.AssertPrints("13"):
         ip.run_cell("test")
-        nt.assert_true("13" in new_stdout.getvalue())
-    finally:
-        sys.stdout = original_stdout
-        new_stdout.close()
 
     
 # XXX failing for now, until we get clearcmd out of quarantine.  But we should
 # fix this and revert the skip to happen only if numpy is not around.
 #@dec.skipif_not_numpy
 @dec.skip_known_failure
 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)
     _ip.magic('clear array')
     yield (nt.assert_false, 'a' in _ip.user_ns)
     
 
 # Multiple tests for clipboard pasting
 @dec.parametric
 def test_paste():
     _ip = get_ipython()
     def paste(txt, flags='-q'):
         """Paste input text, by default in quiet mode"""
         hooks.clipboard_get = lambda : txt
         _ip.magic('paste '+flags)
 
     # Inject fake clipboard hook but save original so we can restore it later
     hooks = _ip.hooks
     user_ns = _ip.user_ns
     original_clip = hooks.clipboard_get
 
     try:
         # Run tests with fake clipboard function
         user_ns.pop('x', None)
         paste('x=1')
         yield nt.assert_equal(user_ns['x'], 1)
 
         user_ns.pop('x', None)
         paste('>>> x=2')
         yield nt.assert_equal(user_ns['x'], 2)
 
         paste("""
         >>> x = [1,2,3]
         >>> y = []
         >>> for i in x:
         ...     y.append(i**2)
         ...
         """)
         yield nt.assert_equal(user_ns['x'], [1,2,3])
         yield nt.assert_equal(user_ns['y'], [1,4,9])
 
         # Now, test that paste -r works
         user_ns.pop('x', None)
         yield nt.assert_false('x' in user_ns)
         _ip.magic('paste -r')
         yield nt.assert_equal(user_ns['x'], [1,2,3])
 
         # Also test paste echoing, by temporarily faking the writer
         w = StringIO()
         writer = _ip.write
         _ip.write = w.write
         code = """
         a = 100
         b = 200"""
         try:
             paste(code,'')
             out = w.getvalue()
         finally:
             _ip.write = writer
         yield nt.assert_equal(user_ns['a'], 100)
         yield nt.assert_equal(user_ns['b'], 200)
         yield nt.assert_equal(out, code+"\n## -- End pasted text --\n")
         
     finally:
         # Restore original hook
         hooks.clipboard_get = original_clip
 
 
 def test_time():
     _ip.magic('time None')
 
 
 @py3compat.doctest_refactor_print
 def doctest_time():
     """
     In [10]: %time None
     CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
     Wall time: 0.00 s
     
     In [11]: def f(kmjy):
        ....:    %time print 2*kmjy
        
     In [12]: f(3)
     6
     CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
     Wall time: 0.00 s
     """
 
 
 def test_doctest_mode():
     "Toggle doctest_mode twice, it should be a no-op and run without error"
     _ip.magic('doctest_mode')
     _ip.magic('doctest_mode')
 
 
 def test_parse_options():
     """Tests for basic options parsing in magics."""
     # These are only the most minimal of tests, more should be added later.  At
     # the very least we check that basic text/unicode calls work OK.
     nt.assert_equal(_ip.parse_options('foo', '')[1], 'foo')
     nt.assert_equal(_ip.parse_options(u'foo', '')[1], u'foo')
 
     
 def test_dirops():
     """Test various directory handling operations."""
     # curpath = lambda :os.path.splitdrive(os.getcwdu())[1].replace('\\','/')
     curpath = os.getcwdu
     startdir = os.getcwdu()
     ipdir = _ip.ipython_dir
     try:
         _ip.magic('cd "%s"' % ipdir)
         nt.assert_equal(curpath(), ipdir)
         _ip.magic('cd -')
         nt.assert_equal(curpath(), startdir)
         _ip.magic('pushd "%s"' % ipdir)
         nt.assert_equal(curpath(), ipdir)
         _ip.magic('popd')
         nt.assert_equal(curpath(), startdir)
     finally:
         os.chdir(startdir)
 
 
 def check_cpaste(code, should_fail=False):
     """Execute code via 'cpaste' and ensure it was executed, unless
     should_fail is set.
     """
     _ip.user_ns['code_ran'] = False
 
     src = StringIO()
     src.write('\n')
     src.write(code)
     src.write('\n--\n')
     src.seek(0)
 
     stdin_save = sys.stdin
     sys.stdin = src
     
     try:
         _ip.magic('cpaste')
     except:
         if not should_fail:
             raise AssertionError("Failure not expected : '%s'" %
                                  code)
     else:
         assert _ip.user_ns['code_ran']
         if should_fail:
             raise AssertionError("Failure expected : '%s'" % code)
     finally:
         sys.stdin = stdin_save
 
 
 def test_cpaste():
     """Test cpaste magic"""
 
     def run():
         """Marker function: sets a flag when executed.
         """
         _ip.user_ns['code_ran'] = True
         return 'run' # return string so '+ run()' doesn't result in success
 
     tests = {'pass': ["> > > run()",
                       ">>> > run()",
                       "+++ run()",
                       "++ run()",
                       "  >>> run()"],
 
              'fail': ["+ + run()",
                       " ++ run()"]}
 
     _ip.user_ns['run'] = run
 
     for code in tests['pass']:
         check_cpaste(code)
 
     for code in tests['fail']:
         check_cpaste(code, should_fail=True)
 
 def test_xmode():
     # Calling xmode three times should be a no-op
     xmode = _ip.InteractiveTB.mode
     for i in range(3):
         _ip.magic("xmode")
     nt.assert_equal(_ip.InteractiveTB.mode, xmode)
     
 def test_reset_hard():
     monitor = []
     class A(object):
         def __del__(self):
             monitor.append(1)
         def __repr__(self):
             return "<A instance>"
             
     _ip.user_ns["a"] = A()
     _ip.run_cell("a")
     
     nt.assert_equal(monitor, [])
     _ip.magic_reset("-f")
     nt.assert_equal(monitor, [1])
     
 class TestXdel(tt.TempFileMixin):
     def test_xdel(self):
         """Test that references from %run are cleared by xdel."""
         src = ("class A(object):\n"
                "    monitor = []\n"
                "    def __del__(self):\n"
                "        self.monitor.append(1)\n"
                "a = A()\n")
         self.mktmp(src)
         # %run creates some hidden references...
         _ip.magic("run %s" % self.fname)
         # ... as does the displayhook.
         _ip.run_cell("a")
         
         monitor = _ip.user_ns["A"].monitor
         nt.assert_equal(monitor, [])
         
         _ip.magic("xdel a")
         
         # Check that a's __del__ method has been called.
         nt.assert_equal(monitor, [1])
 
 def doctest_who():
     """doctest for %who
     
     In [1]: %reset -f
     
     In [2]: alpha = 123
     
     In [3]: beta = 'beta'
     
     In [4]: %who int
     alpha
     
     In [5]: %who str
     beta
     
     In [6]: %whos
     Variable   Type    Data/Info
     ----------------------------
     alpha      int     123
     beta       str     beta
     
     In [7]: %who_ls
     Out[7]: ['alpha', 'beta']
     """
 
 @py3compat.u_format
 def doctest_precision():
     """doctest for %precision
     
     In [1]: f = get_ipython().shell.display_formatter.formatters['text/plain']
     
     In [2]: %precision 5
     Out[2]: {u}'%.5f'
     
     In [3]: f.float_format
     Out[3]: {u}'%.5f'
     
     In [4]: %precision %e
     Out[4]: {u}'%e'
     
     In [5]: f(3.1415927)
     Out[5]: {u}'3.141593e+00'
     """