ninja windows: make sure there's a trailing slash on $(VCInstallDir)

test/win/gyptest-macro-vcinstalldir.py

Index: test/win/gyptest-macro-vcinstalldir.py
diff --git a/test/win/gyptest-macro-vcinstalldir.py b/test/win/gyptest-macro-vcinstalldir.py
new file mode 100644
index 0000000000000000000000000000000000000000..6a859704b34e69818da29f9f0a74b0b200620d80
--- /dev/null
+++ b/test/win/gyptest-macro-vcinstalldir.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Make sure macro expansion of $(VCInstallDir) is handled, and specifically
+always / terminated for compatibility.
+"""
+
+import TestGyp
+
+import sys
+
+if sys.platform == 'win32':
+  test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
+
+  CHDIR = 'vs-macros'
+  test.run_gyp('vcinstalldir.gyp', chdir=CHDIR)
+  test.build('vcinstalldir.gyp', test.ALL, chdir=CHDIR)
+  test.pass_test()