Add an app_shell_unittests target

extensions/shell/browser/shell_nacl_browser_delegate_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "extensions/shell/browser/shell_nacl_browser_delegate.h"
+
+#include "base/strings/string_util.h"
+#include "content/public/test/test_browser_context.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace extensions {
+
+typedef testing::Test ShellNaClBrowserDelegateTest;
+
+// Verifies that the returned version string has a valid format.
+TEST_F(ShellNaClBrowserDelegateTest, VersionString) {
+  content::TestBrowserContext browser_context;
+  ShellNaClBrowserDelegate delegate(&browser_context);
+
+  // Version should look like "1.2.3.4 (5)".
+  std::string version = delegate.GetVersionString();
+  EXPECT_TRUE(MatchPattern(version, "*.*.*.* (*)")) << "bad version "
+                                                    << version;
+}
+
+}  // namespace extensions