[Icons NTP] Add LargeIconUrlParser.

chrome/common/favicon/large_icon_url_parser_unittest.cc

+// Copyright 2015 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/common/favicon/large_icon_url_parser.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+namespace {
+
+const char kTestUrlStr[] = "https://www.google.ca/imghp?hl=en&tab=wi";
+
+}  // namespace
+
+TEST(LargeIconUrlParserTest, ParseLargeIconPathSuccess) {
+  // Everything populated.
+  {
+    LargeIconUrlParser parser;
+    EXPECT_TRUE(parser.Parse(std::string("48/") + kTestUrlStr));
+    EXPECT_EQ(48, parser.size_in_pixels());
+    EXPECT_EQ(GURL(kTestUrlStr), GURL(parser.url_string()));
+    EXPECT_EQ(3U, parser.path_index());
+  }
+
+  // Empty URL.
+  {
+    LargeIconUrlParser parser;
+    EXPECT_TRUE(parser.Parse("48/"));
+    EXPECT_EQ(48, parser.size_in_pixels());
+    EXPECT_EQ(GURL(), GURL(parser.url_string()));
+    EXPECT_EQ(3U, parser.path_index());
+  }
+
+  // Tolerate invalid URL.
+  {
+    LargeIconUrlParser parser;
+    EXPECT_TRUE(parser.Parse("48/NOT A VALID URL"));
+    EXPECT_EQ(48, parser.size_in_pixels());
+    EXPECT_EQ("NOT A VALID URL", parser.url_string());
+    EXPECT_EQ(3U, parser.path_index());
+  }
+}
+
+TEST(LargeIconUrlParserTest, ParseLargeIconPathFailure) {
+  const char* const test_cases[] = {
+    "",
+    "/",
+    "//",
+    "48",  // Missing '/'.
+    "/http://www.google.com/",  // Missing size.
+    "not_a_number/http://www.google.com/",  // Bad size.
+    "0/http://www.google.com/",  // Non-positive size.
+    "-1/http://www.google.com/",  // Non-positive size.
+  };
+  for (size_t i = 0; i < arraysize(test_cases); ++i) {
+    LargeIconUrlParser parser;
+    EXPECT_FALSE(parser.Parse(test_cases[i])) << "test_cases[" << i << "]";
+  }
+}