Added test file for SystemInfo.m, on top of the initial commit for Chrome meta installer.

Just look at BUILD.gn and SystemInfo_test.mm, everything else is consistent with CL 2094583004 (Initial commit for Chrome meta installer https://codereview.chromium.org/2094583004/)

BUG=

patch from issue 2106523002 at patchset 60001 (http://crrev.com/2106523002#ps60001)

Review-Url: https://codereview.chromium.org/2137743002
Cr-Commit-Position: refs/heads/master@{#407573}

chrome/installer/mac/app/BUILD.gn

@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
+
 static_library("mac_installer_base") {
   sources = [
     "Downloader.m",
@@ -21,9 +23,19 @@ executable("mac_installer") {
   deps = [
     ":mac_installer_base",
   ]
-  libs = [
-    "AppKit.framework",
-    "CoreFoundation.framework",
-    "Foundation.framework",
+  libs = [ "Foundation.framework" ]
+}
+
+test("mac_installer_test") {
+  sources = [
+    "testing/OmahaXMLRequest_test.mm",
+    "testing/SystemInfo_test.mm",
+  ]
+  deps = [
+    ":mac_installer_base",
+    "//base:base",
+    "//base/test:run_all_unittests",
+    "//testing/gtest:gtest",
   ]
+  libs = [ "Foundation.framework" ]
 }

chrome/installer/mac/app/testing/OmahaXMLRequest_test.mm

+// Copyright 2016 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.
+
+#import "chrome/installer/mac/app/OmahaXMLRequest.h"
+
+#include "base/mac/scoped_nsobject.h"
+#include "base/macros.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+TEST(OmahaXMLRequestTest, CreateReturnsValidXML) {
+  base::scoped_nsobject<NSXMLDocument> xml_body_(
+      [OmahaXMLRequest createXMLRequestBody]);
+  ASSERT_TRUE(xml_body_);
+
+  NSString* requestDTDLocation = [[[[NSBundle mainBundle] bundlePath]
+      stringByAppendingPathComponent:
+          @"../../chrome/installer/mac/app/testing/requestCheck.dtd"]
+      stringByResolvingSymlinksInPath];
+  NSData* requestDTDData = [NSData dataWithContentsOfFile:requestDTDLocation];
+  ASSERT_TRUE(requestDTDData);
+
+  NSError* error;
+  NSXMLDTD* requestXMLChecker =
+      [[NSXMLDTD alloc] initWithData:requestDTDData options:0 error:&error];
+  [requestXMLChecker setName:@"request"];
+  [xml_body_ setDTD:requestXMLChecker];
+  EXPECT_TRUE([xml_body_ validateAndReturnError:&error]);
+}
+
+}  // namespace

chrome/installer/mac/app/testing/SystemInfo_test.mm

+// Copyright 2016 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.
+
+#import "chrome/installer/mac/app/SystemInfo.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+TEST(SystemInfoTest, GetArchReturnsExpectedString) {
+  NSString* arch = [SystemInfo getArch];
+
+  EXPECT_TRUE([arch isEqualToString:@"i486"] ||
+              [arch isEqualToString:@"x86_64h"]);
+}
+
+TEST(SystemInfoTest, GetOSVersionMatchesRegexFormat) {
+  NSString* os_version = [SystemInfo getOSVersion];
+
+  NSRegularExpression* regex = [NSRegularExpression
+      regularExpressionWithPattern:@"^10\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)$"
+                           options:0
+                             error:nil];
+  NSUInteger matches =
+      [regex numberOfMatchesInString:os_version
+                             options:0
+                               range:NSMakeRange(0, os_version.length)];
+  EXPECT_EQ(1u, matches);
+}
+
+}  // namespace

chrome/installer/mac/app/testing/requestCheck.dtd

+<!--
+  Copyright 2016 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.
+-->
+<!--
+
+  Welcome to a document type declaration (DTD).
+  This is a document that makes sure XML files are correctly formed.
+
+  Below, |request| is implied to be the root element of the XML document, whose
+  children are |os| and |app|.
+-->
+<!ELEMENT request (os, app)>
+<!--
+
+  Below, this indicates that |protocol| is a required attribute of the
+  |request| element; by indicating `NMTOKEN`, we indicate that this attribute
+  must have a value associated with it that does not contain whitespace. `CDATA`
+  would be the more commonly used keyword for content with whitespace.
+-->
+<!ATTLIST request protocol NMTOKEN #REQUIRED>
+<!--
+
+  The |os| element should not have any children and cannot have any content
+  within the tag. (<os/> and <os></os> are allowed, but <os>stuff here!</os> is
+  not a valid element.)
+-->
+<!ELEMENT os EMPTY>
+<!--
+
+  This |platform| attribute is a required attribute of |os|, and its value must
+  be "mac".
+-->
+<!ATTLIST os platform (mac) #REQUIRED>
+<!--
+
+  The |version|, |arch|, and |sp| attributes are optional attributes of |os|. If
+  a request's XML body has the |sp|, it may not need the version or arch; if the
+  |sp| is not included but |version| and |arch| are specified, the XML body is
+  still valid. Unfortunately there is relatively less logic available for
+  attributes, so I currently cannot reject the XML document if there is only
+  either |arch| or |version|.
+-->
+<!ATTLIST os version NMTOKEN #IMPLIED>
+<!ATTLIST os arch NMTOKEN #IMPLIED>
+<!ATTLIST os sp NMTOKEN #IMPLIED>
+<!--
+
+  |app| has only one child, |updatecheck|.
+-->
+<!ELEMENT app (updatecheck)>
+<!--
+
+  The |appid| attribute of the |app| element must have "com.google.Chrome" as
+  its value.
+-->
+<!ATTLIST app appid (com.google.Chrome) #REQUIRED>
+<!--
+
+  The following two attributes are required; their values must not contain
+  whitespace.
+-->
+<!ATTLIST app version NMTOKEN #REQUIRED>
+<!ATTLIST app lang NMTOKEN #REQUIRED>
+<!--
+
+  |updatecheck| must be an empty element.
+-->
+<!ELEMENT updatecheck EMPTY>