Fix pytest fixtures on Win10 (#1326)

Catch and deal with failed symlinking on Windows

tests/conftest.py

@@ -87,7 +87,15 @@ def mock_download(self, url, dest):
     if dest.exists():
         os.unlink(str(dest))
 
-    if PY2 and WINDOWS:
+    # Python2 does not support os.symlink on Windows whereas Python3 does.  os.symlink requires either administrative
+    # privileges or developer mode on Win10, throwing an OSError is neither is active.
+    if WINDOWS:
+        if PY2:
+            shutil.copyfile(str(fixture), str(dest))
+        else:
+            try:
+                os.symlink(str(fixture), str(dest))
+            except OSError:
                 shutil.copyfile(str(fixture), str(dest))
     else:
         os.symlink(str(fixture), str(dest))

tests/console/conftest.py

@@ -52,7 +52,15 @@ def mock_download(self, url, dest):
     if dest.exists():
         shutil.rmtree(str(dest))
 
-    if PY2 and WINDOWS:
+    # Python2 does not support os.symlink on Windows whereas Python3 does.  os.symlink requires either administrative
+    # privileges or developer mode on Win10, throwing an OSError is neither is active.
+    if WINDOWS:
+        if PY2:
+            shutil.copyfile(str(fixture), str(dest))
+        else:
+            try:
+                os.symlink(str(fixture), str(dest))
+            except OSError:
                 shutil.copyfile(str(fixture), str(dest))
     else:
         os.symlink(str(fixture), str(dest))