update windows build to Python 3.7

Lib/distutils/tests/test_bdist_wininst.py

@@ -0,0 +1,33 @@
+"""Tests for distutils.command.bdist_wininst."""
+import unittest
+from test.support import run_unittest
+
+from distutils.command.bdist_wininst import bdist_wininst
+from distutils.tests import support
+
+@unittest.skipIf(getattr(bdist_wininst, '_unsupported', False),
+    'bdist_wininst is not supported in this install')
+class BuildWinInstTestCase(support.TempdirManager,
+                           support.LoggingSilencer,
+                           unittest.TestCase):
+
+    def test_get_exe_bytes(self):
+
+        # issue5731: command was broken on non-windows platforms
+        # this test makes sure it works now for every platform
+        # let's create a command
+        pkg_pth, dist = self.create_dist()
+        cmd = bdist_wininst(dist)
+        cmd.ensure_finalized()
+
+        # let's run the code that finds the right wininst*.exe file
+        # and make sure it finds it and returns its content
+        # no matter what platform we have
+        exe_file = cmd.get_exe_bytes()
+        self.assertGreater(len(exe_file), 10)
+
+def test_suite():
+    return unittest.makeSuite(BuildWinInstTestCase)
+
+if __name__ == '__main__':
+    run_unittest(test_suite())