diff --git a/IPython/utils/tests/test_openpy.py b/IPython/utils/tests/test_openpy.py
index 9e66d43..e205f06 100644
--- a/IPython/utils/tests/test_openpy.py
+++ b/IPython/utils/tests/test_openpy.py
@@ -1,6 +1,5 @@
 import io
 import os.path
-import nose.tools as nt
 
 from IPython.utils import openpy
 
@@ -11,14 +10,14 @@ nonascii_path = os.path.join(mydir, "../../core/tests/nonascii.py")
 def test_detect_encoding():
     with open(nonascii_path, "rb") as f:
         enc, lines = openpy.detect_encoding(f.readline)
-    nt.assert_equal(enc, "iso-8859-5")
+    assert enc == "iso-8859-5"
 
 
 def test_read_file():
     with io.open(nonascii_path, encoding="iso-8859-5") as f:
         read_specified_enc = f.read()
     read_detected_enc = openpy.read_py_file(nonascii_path, skip_encoding_cookie=False)
-    nt.assert_equal(read_detected_enc, read_specified_enc)
+    assert read_detected_enc == read_specified_enc
     assert "coding: iso-8859-5" in read_detected_enc
 
     read_strip_enc_cookie = openpy.read_py_file(
@@ -30,10 +29,10 @@ def test_read_file():
 def test_source_to_unicode():
     with io.open(nonascii_path, "rb") as f:
         source_bytes = f.read()
-    nt.assert_equal(
-        openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines(),
-        source_bytes.decode("iso-8859-5").splitlines(),
+    assert (
+        openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines()
+        == source_bytes.decode("iso-8859-5").splitlines()
     )
 
     source_no_cookie = openpy.source_to_unicode(source_bytes, skip_encoding_cookie=True)
-    nt.assert_not_in("coding: iso-8859-5", source_no_cookie)
+    assert "coding: iso-8859-5" not in source_no_cookie