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"""Tests for the key interactiveshell module.
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Historically the main classes in interactiveshell have been under-tested. This
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module should grow as many single-method tests as possible to trap many of the
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recurring bugs we seem to encounter with high-level interaction.
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Authors
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-------
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* Fernando Perez
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# stdlib
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import unittest
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from StringIO import StringIO
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from IPython.testing import decorators as dec
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from IPython.utils import io
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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class InteractiveShellTestCase(unittest.TestCase):
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def test_naked_string_cells(self):
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"""Test that cells with only naked strings are fully executed"""
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ip = get_ipython()
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# First, single-line inputs
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ip.run_cell('"a"\n')
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self.assertEquals(ip.user_ns['_'], 'a')
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# And also multi-line cells
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ip.run_cell('"""a\nb"""\n')
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self.assertEquals(ip.user_ns['_'], 'a\nb')
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def test_run_empty_cell(self):
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"""Just make sure we don't get a horrible error with a blank
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cell of input. Yes, I did overlook that."""
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ip = get_ipython()
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old_xc = ip.execution_count
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ip.run_cell('')
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self.assertEquals(ip.execution_count, old_xc)
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def test_run_cell_multiline(self):
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"""Multi-block, multi-line cells must execute correctly.
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"""
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ip = get_ipython()
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src = '\n'.join(["x=1",
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"y=2",
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"if 1:",
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" x += 1",
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" y += 1",])
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ip.run_cell(src)
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self.assertEquals(ip.user_ns['x'], 2)
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self.assertEquals(ip.user_ns['y'], 3)
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def test_multiline_string_cells(self):
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"Code sprinkled with multiline strings should execute (GH-306)"
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ip = get_ipython()
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ip.run_cell('tmp=0')
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self.assertEquals(ip.user_ns['tmp'], 0)
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ip.run_cell('tmp=1;"""a\nb"""\n')
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self.assertEquals(ip.user_ns['tmp'], 1)
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def test_dont_cache_with_semicolon(self):
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"Ending a line with semicolon should not cache the returned object (GH-307)"
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ip = get_ipython()
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oldlen = len(ip.user_ns['Out'])
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a = ip.run_cell('1;', store_history=True)
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newlen = len(ip.user_ns['Out'])
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self.assertEquals(oldlen, newlen)
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#also test the default caching behavior
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ip.run_cell('1', store_history=True)
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newlen = len(ip.user_ns['Out'])
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self.assertEquals(oldlen+1, newlen)
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def test_In_variable(self):
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"Verify that In variable grows with user input (GH-284)"
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ip = get_ipython()
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oldlen = len(ip.user_ns['In'])
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ip.run_cell('1;', store_history=True)
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newlen = len(ip.user_ns['In'])
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self.assertEquals(oldlen+1, newlen)
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self.assertEquals(ip.user_ns['In'][-1],'1;')
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def test_magic_names_in_string(self):
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ip = get_ipython()
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ip.run_cell('a = """\n%exit\n"""')
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self.assertEquals(ip.user_ns['a'], '\n%exit\n')
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def test_alias_crash(self):
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"""Errors in prefilter can't crash IPython"""
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ip = get_ipython()
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ip.run_cell('%alias parts echo first %s second %s')
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# capture stderr:
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save_err = io.stderr
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io.stderr = StringIO()
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ip.run_cell('parts 1')
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err = io.stderr.getvalue()
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io.stderr = save_err
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self.assertEquals(err.split(':')[0], 'ERROR')
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def test_trailing_newline(self):
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"""test that running !(command) does not raise a SyntaxError"""
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ip = get_ipython()
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ip.run_cell('!(true)\n', False)
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ip.run_cell('!(true)\n\n\n', False)
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def test_gh_597(self):
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"""Pretty-printing lists of objects with non-ascii reprs may cause
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problems."""
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class Spam(object):
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def __repr__(self):
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return "\xe9"*50
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import IPython.core.formatters
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f = IPython.core.formatters.PlainTextFormatter()
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f([Spam(),Spam()])
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def test_future_flags(self):
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"""Check that future flags are used for parsing code (gh-777)"""
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ip = get_ipython()
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ip.run_cell('from __future__ import print_function')
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try:
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ip.run_cell('prfunc_return_val = print(1,2, sep=" ")')
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assert 'prfunc_return_val' in ip.user_ns
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finally:
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# Reset compiler flags so we don't mess up other tests.
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ip.compile.reset_compiler_flags()
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def test_future_unicode(self):
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"""Check that unicode_literals is imported from __future__ (gh #786)"""
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ip = get_ipython()
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try:
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ip.run_cell(u'byte_str = "a"')
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assert isinstance(ip.user_ns['byte_str'], str) # string literals are byte strings by default
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ip.run_cell('from __future__ import unicode_literals')
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ip.run_cell(u'unicode_str = "a"')
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assert isinstance(ip.user_ns['unicode_str'], unicode) # strings literals are now unicode
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finally:
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# Reset compiler flags so we don't mess up other tests.
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ip.compile.reset_compiler_flags()
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def test_bad_custom_tb(self):
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"""Check that InteractiveShell is protected from bad custom exception handlers"""
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ip = get_ipython()
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from IPython.utils import io
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save_stderr = io.stderr
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try:
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# capture stderr
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io.stderr = StringIO()
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ip.set_custom_exc((IOError,), lambda etype,value,tb: 1/0)
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self.assertEquals(ip.custom_exceptions, (IOError,))
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ip.run_cell(u'raise IOError("foo")')
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self.assertEquals(ip.custom_exceptions, ())
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self.assertTrue("Custom TB Handler failed" in io.stderr.getvalue())
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finally:
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io.stderr = save_stderr
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def test_bad_custom_tb_return(self):
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"""Check that InteractiveShell is protected from bad return types in custom exception handlers"""
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ip = get_ipython()
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from IPython.utils import io
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save_stderr = io.stderr
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try:
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# capture stderr
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io.stderr = StringIO()
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ip.set_custom_exc((NameError,),lambda etype,value,tb, tb_offset=None: 1)
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self.assertEquals(ip.custom_exceptions, (NameError,))
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ip.run_cell(u'a=abracadabra')
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self.assertEquals(ip.custom_exceptions, ())
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self.assertTrue("Custom TB Handler failed" in io.stderr.getvalue())
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finally:
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io.stderr = save_stderr
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def test_drop_by_id(self):
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ip = get_ipython()
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myvars = {"a":object(), "b":object(), "c": object()}
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ip.push(myvars, interactive=False)
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for name in myvars:
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assert name in ip.user_ns, name
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assert name in ip.user_ns_hidden, name
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ip.user_ns['b'] = 12
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ip.drop_by_id(myvars)
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for name in ["a", "c"]:
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assert name not in ip.user_ns, name
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assert name not in ip.user_ns_hidden, name
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assert ip.user_ns['b'] == 12
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ip.reset()
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