test first element of sys.path in Kernel

both when `--profile-dir` is specified, and when it is not.

IPython/kernel/tests/test_kernel.py

@@ -17,6 +17,7 b' import nose.tools as nt'
 
 from IPython.testing import decorators as dec, tools as tt
 from IPython.utils import py3compat
+from IPython.utils.path import locate_profile
 
 from .utils import new_kernel, kernel, TIMEOUT, assemble_output, execute, flush_channels
 
@@ -46,6 +47,21 b' def test_simple_print():'
         _check_mp_mode(kc, expected=False)
 
 
+def test_sys_path():
+    """test that sys.path doesn't get messed up by default"""
+    with kernel() as kc:
+        msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")
+        stdout, stderr = assemble_output(kc.iopub_channel)
+        nt.assert_equal(stdout, "''\n")
+
+def test_sys_path_profile_dir():
+    """test that sys.path doesn't get messed up when `--profile-dir` is specified"""
+    
+    with new_kernel(['--profile-dir', locate_profile('default')]) as kc:
+        msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")
+        stdout, stderr = assemble_output(kc.iopub_channel)
+        nt.assert_equal(stdout, "''\n")
+
 @dec.knownfailureif(sys.platform == 'win32', "subprocess prints fail on Windows")
 def test_subprocess_print():
     """printing from forked mp.Process"""

IPython/kernel/tests/utils.py

@@ -36,10 +36,13 b' KC = None'
 #-------------------------------------------------------------------------------
 
 
-def start_new_kernel():
+def start_new_kernel(argv=None):
     """start a new kernel, and return its Manager and Client"""
     km = KernelManager()
-    km.start_kernel(stdout=PIPE, stderr=PIPE)
+    kwargs = dict(stdout=PIPE, stderr=PIPE)
+    if argv:
+        kwargs['extra_arguments'] = argv
+    km.start_kernel(**kwargs)
     kc = km.client()
     kc.start_channels()
     
@@ -123,7 +126,7 b' def stop_global_kernel():'
     KM = None
 
 @contextmanager
-def new_kernel():
+def new_kernel(argv=None):
     """Context manager for a new kernel in a subprocess
     
     Should only be used for tests where the kernel must not be re-used.
@@ -132,7 +135,7 b' def new_kernel():'
     -------
     kernel_client: connected KernelClient instance
     """
-    km, kc = start_new_kernel()
+    km, kc = start_new_kernel(argv)
     try:
         yield kc
     finally: