Uploaded Test files

venv/Lib/site-packages/IPython/utils/tests/test_io.py

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+# encoding: utf-8
+"""Tests for io.py"""
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+
+import sys
+from io import StringIO
+
+from subprocess import Popen, PIPE
+import unittest
+
+import nose.tools as nt
+
+from IPython.utils.io import IOStream, Tee, capture_output
+
+
+def test_tee_simple():
+    "Very simple check with stdout only"
+    chan = StringIO()
+    text = 'Hello'
+    tee = Tee(chan, channel='stdout')
+    print(text, file=chan)
+    nt.assert_equal(chan.getvalue(), text+"\n")
+
+
+class TeeTestCase(unittest.TestCase):
+
+    def tchan(self, channel):
+        trap = StringIO()
+        chan = StringIO()
+        text = 'Hello'
+        
+        std_ori = getattr(sys, channel)
+        setattr(sys, channel, trap)
+
+        tee = Tee(chan, channel=channel)
+
+        print(text, end='', file=chan)
+        trap_val = trap.getvalue()
+        nt.assert_equal(chan.getvalue(), text)
+
+        tee.close()
+
+        setattr(sys, channel, std_ori)
+        assert getattr(sys, channel) == std_ori
+
+    def test(self):
+        for chan in ['stdout', 'stderr']:
+            self.tchan(chan)
+
+def test_io_init():
+    """Test that io.stdin/out/err exist at startup"""
+    for name in ('stdin', 'stdout', 'stderr'):
+        cmd = "from IPython.utils import io;print(io.%s.__class__)"%name
+        with Popen([sys.executable, '-c', cmd], stdout=PIPE) as p:
+            p.wait()
+            classname = p.stdout.read().strip().decode('ascii')
+        # __class__ is a reference to the class object in Python 3, so we can't
+        # just test for string equality.
+        assert 'IPython.utils.io.IOStream' in classname, classname
+
+class TestIOStream(unittest.TestCase):
+
+    def test_IOStream_init(self):
+        """IOStream initializes from a file-like object missing attributes. """
+        # Cause a failure from getattr and dir(). (Issue #6386)
+        class BadStringIO(StringIO):
+            def __dir__(self):
+                attrs = super().__dir__()
+                attrs.append('name')
+                return attrs
+        with self.assertWarns(DeprecationWarning):
+            iostream = IOStream(BadStringIO())
+            iostream.write('hi, bad iostream\n')
+
+        assert not hasattr(iostream, 'name')
+        iostream.close()
+
+    def test_capture_output(self):
+        """capture_output() context works"""
+        
+        with capture_output() as io:
+            print('hi, stdout')
+            print('hi, stderr', file=sys.stderr)
+        
+        nt.assert_equal(io.stdout, 'hi, stdout\n')
+        nt.assert_equal(io.stderr, 'hi, stderr\n')