diff --git a/odo/backends/tests/test_dask_dataframe.py b/odo/backends/tests/test_dask_dataframe.py
index de44c234..3c2daf93 100644
--- a/odo/backends/tests/test_dask_dataframe.py
+++ b/odo/backends/tests/test_dask_dataframe.py
@@ -17,7 +17,7 @@
 
 def test_discover():
     df = pd.DataFrame({'x': list('a'*5 + 'b'*5 + 'c'*5),
-                       'y': range(15),
+                       'y': np.arange(15, dtype=np.int64),
                        'z': list(map(float, range(15)))},
                        columns=['x', 'y', 'z'])
     df.x = df.x.astype('category')
diff --git a/odo/backends/tests/test_pandas.py b/odo/backends/tests/test_pandas.py
index 4b039a0b..9b1aa1eb 100644
--- a/odo/backends/tests/test_pandas.py
+++ b/odo/backends/tests/test_pandas.py
@@ -75,7 +75,8 @@ def test_timedelta_to_pandas():
 
 def test_categorical_pandas():
     df = pd.DataFrame({'x': list('a'*5 + 'b'*5 + 'c'*5),
-                       'y': range(15)}, columns=['x', 'y'])
+                       'y': np.arange(15, dtype=np.int64)},
+		      columns=['x', 'y'])
     df.x = df.x.astype('category')
     assert_dshape_equal(discover(df), 15 * Record([('x',
                         Categorical(['a', 'b', 'c'])), ('y', int64)]))
diff --git a/odo/backends/tests/test_postgres.py b/odo/backends/tests/test_postgres.py
index abb6ec66..30ec6d94 100644
--- a/odo/backends/tests/test_postgres.py
+++ b/odo/backends/tests/test_postgres.py
@@ -17,11 +17,13 @@
 from odo import odo, into, resource, drop, discover, convert
 from odo.utils import assert_allclose, tmpfile
 
+@pytest.fixture(scope='module')
+def pg_ip():
+    return os.environ.get('POSTGRES_IP', 'localhost')
 
 skip_no_rw_loc = \
-    pytest.mark.skipif(sys.platform == 'win32' and os.environ.get('POSTGRES_TMP_DIR') is None,
-                       reason=("Requires a read/write location defined by "
-                               "env var POSTGRES_TMP_DIR"))
+    pytest.mark.skipif(pg_ip() != 'localhost',
+                       reason=("Skipping tests with remote PG server (%s)" % pg_ip()))
 
 names = ('tbl%d' % i for i in itertools.count())
 new_schema = object()
@@ -61,11 +63,6 @@ def complex_csv(tmpdir):
         yield CSV(fn, has_header=True)
 
 
-@pytest.fixture(scope='module')
-def pg_ip():
-    return os.environ.get('POSTGRES_IP', 'localhost')
-
-
 @pytest.fixture
 def url(pg_ip):
     return 'postgresql://postgres@{}/test::{}'.format(pg_ip, next(names))
diff --git a/odo/backends/tests/test_sqlite.py b/odo/backends/tests/test_sqlite.py
index 0b6120b8..a07175fe 100644
--- a/odo/backends/tests/test_sqlite.py
+++ b/odo/backends/tests/test_sqlite.py
@@ -1,6 +1,7 @@
 from __future__ import absolute_import, division, print_function
 
 import os
+import sys
 from platform import platform
 from itertools import product
 import pytest
@@ -84,7 +85,8 @@ def test_different_encoding():
                   'sqlite:///%s::t' % db, encoding=encoding)
         result = odo(sql, list)
 
-    NULL = u'' if 'windows' not in platform().lower() else None
+    NULL = u''
+
     expected = [(u'1958.001.500131-1A', 1, NULL, NULL, 899),
                 (u'1958.001.500156-6', 1, NULL, NULL, 899),
                 (u'1958.001.500162-1', 1, NULL, NULL, 899),