Add test for st_nlink on win

tests/test_misc.py

@@ -3,9 +3,12 @@
 from os import link
 from os.path import join
 
+import pytest
+from conda_build.utils import on_win
 import conda_build._link as _link
 from conda_build.conda_interface import PathType, EntityEncoder, CrossPlatformStLink
 
+
 class TestLink(unittest.TestCase):
 
     def test_pyc_f_2(self):
@@ -43,6 +46,7 @@ def test_entity_encoder(tmpdir):
     assert json_file == {"a": "hardlink", "b": 1}
 
 
+@pytest.skipif(on_win, reason="link not available on win/py2.7")
 def test_crossplatform_st_link(tmpdir):
     test_file = join(str(tmpdir), "test-file")
     test_file_linked = join(str(tmpdir), "test-file-linked")
@@ -55,3 +59,9 @@ def test_crossplatform_st_link(tmpdir):
     assert 2 == CrossPlatformStLink.st_nlink(test_file_link)
     assert 2 == CrossPlatformStLink.st_nlink(test_file_linked)
 
+
+def test_crossplatform_st_link_on_win(tmpdir):
+    test_file = join(str(tmpdir), "test-file")
+    open(test_file, "a").close()
+    assert 1 == CrossPlatformStLink.st_nlink(test_file)
+