Add unit test for chrome\installer\util\version

BUG=none
TEST=this

Review URL: http://codereview.chromium.org/155842

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21229 0039d316-1c4b-4281-b951-d872f2087c98

chrome/installer/installer.gyp

@@ -274,6 +274,7 @@
             'util/run_all_unittests.cc',
             'util/set_reg_value_work_item_unittest.cc',
             'util/work_item_list_unittest.cc',
+            'util/version_unittest.cc',
           ],
           'msvs_settings': {
             'VCManifestTool': {

chrome/installer/util/version_unittest.cc

+// Copyright (c) 2009 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 "chrome/installer/util/version.h"
+
+#include <string>
+#include <vector>
+
+#include "base/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+static const installer::Version* kNoVersion = NULL;
+
+TEST(VersionTest, Parse) {
+  EXPECT_EQ(installer::Version::GetVersionFromString(L"1"), kNoVersion);
+  EXPECT_EQ(installer::Version::GetVersionFromString(L"1.2"), kNoVersion);
+  EXPECT_EQ(installer::Version::GetVersionFromString(L"1.2.3"), kNoVersion);
+  EXPECT_EQ(installer::Version::GetVersionFromString(L"1.2.3.4.5"), kNoVersion);
+  EXPECT_EQ(installer::Version::GetVersionFromString(L"hokum"), kNoVersion);
+
+  scoped_ptr<installer::Version> v1(
+      installer::Version::GetVersionFromString(L"1.22.333.4444"));
+  EXPECT_EQ(v1->GetString(), L"1.22.333.4444");
+}
+
+bool Implies(bool p, bool q) { return  !p | q; }
+
+TEST(VersionTest, Comparison) {
+  static const wchar_t* version_strings[] = {
+    L"0.0.0.0",
+    L"1.0.0.0",
+    L"0.1.0.0",
+    L"0.0.1.0",
+    L"0.0.0.1",
+    L"2.0.193.1",
+    L"3.0.183.1",
+    L"3.0.187.1",
+    L"3.0.189.0",
+  };
+
+  std::vector<const installer::Version*> versions;
+
+  for (size_t i = 0;  i < _countof(version_strings);  ++i) {
+    std::wstring version_string(version_strings[i]);
+    const installer::Version* version =
+        installer::Version::GetVersionFromString(version_string);
+    EXPECT_NE(version, kNoVersion);
+    EXPECT_EQ(version_string, version->GetString());
+    versions.push_back(version);
+  }
+
+  // Compare all N*N pairs and check that IsHigherThan is antireflexive.
+  for (size_t i = 0;  i < versions.size();  ++i) {
+    const installer::Version* v1 = versions[i];
+    for (size_t j = 0;  j < versions.size();  ++j) {
+      const installer::Version* v2 = versions[j];
+      // Check exactly one of '>', '<', or '=' is true.
+      bool higher = v1->IsHigherThan(v2);
+      bool lower = v2->IsHigherThan(v1);
+      bool equal = v1->GetString() == v2->GetString();
+      EXPECT_EQ(1, higher + lower + equal);
+    }
+  }
+
+  // Compare all N*N*N triples and check that IsHigherThan is a total order.
+  for (size_t i = 0;  i < versions.size();  ++i) {
+    const installer::Version* v1 = versions[i];
+    for (size_t j = 0;  j < versions.size();  ++j) {
+      const installer::Version* v2 = versions[j];
+      for (size_t k = 0;  k < versions.size();  ++k) {
+        const installer::Version* v3 = versions[j];
+        EXPECT_TRUE(Implies(v2->IsHigherThan(v1) && v3->IsHigherThan(v2),
+                            v3->IsHigherThan(v1)));
+      }
+    }
+  }
+
+  for (size_t i = 0;  i < versions.size();  ++i) {
+    delete versions[i];
+  }
+}