winVersion.WinVersion: add unit test cases. Re nvaccess#11837.

Add unit tests for the following:
* winVersion.getWinVer (compared against what Python returns through sys.getwindowsversion)
* Convert a string representation of a Windows release to WinVersion class instance
* See if a specific major.minor.build is returned for a given release

source/winVersion.py

@@ -16,6 +16,7 @@
 		winVersionText+=".%d"%winVersion.service_pack_minor
 winVersionText+=" %s" % ("workstation","domain controller","server")[winVersion.product_type-1]
 
+
 @functools.total_ordering
 class WinVersion(object):
 	"""
@@ -81,6 +82,7 @@ def getWinVer():
 		servicePack=winVersion.service_pack
 	)
 
+
 def getWinVerFromVersionText(versionText: str):
 	major, minor, build = versionText.split(".")
 	return WinVersion(

tests/unit/test_winVersion.py

@@ -0,0 +1,37 @@
+#A part of NonVisual Desktop Access (NVDA)
+#This file is covered by the GNU General Public License.
+#See the file COPYING for more details.
+#Copyright (C) 2020 NV Access Limited, Joseph Lee
+
+"""Unit tests for the Windows version module."""
+
+import unittest
+import sys
+import winVersion
+
+class TestWinVersion(unittest.TestCase):
+
+	def test_getWinVer(self):
+		# Test a 3-tuple consisting of version major, minor, build.
+		# sys.getwindowsversion() internally returns a named tuple, so comparing tuples is possible.
+		currentWinVer = winVersion.getWinVer()
+		winVerPython = sys.getwindowsversion()
+		self.assertTupleEqual(
+			(currentWinVer.major, currentWinVer.minor, currentWinVer.build),
+			winVerPython[:3]
+		)
+
+	def test_specificWinVer(self):
+		# Try detecting Windows 8.1 or later.
+		win81 = winVersion.WinVersion(release="8.1")
+		self.assertTupleEqual(
+			(win81.major, win81.minor, win81.build),
+			(6, 3, 9600)
+		)
+
+	def test_getWinVerFromVersionText(self):
+		winTenInitial = winVersion.getWinVerFromVersionText("10.0.10240")
+		self.assertTupleEqual(
+			(winTenInitial.major, winTenInitial.minor, winTenInitial.build),
+			(10, 0, 10240)
+		)