Add stream operators for URLPattern and URLPatternSet and unit test for URLPatternSet

extensions/common/url_pattern_set_unittest.cc

 // Copyright (c) 2012 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/common/url_pattern_set.h"
 
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
@@ skipping 42 matching lines @@
 TEST(URLPatternSetTest, Two) {
   URLPatternSet set;
   AddPattern(&set, "http://www.google.com/*");
   AddPattern(&set, "http://www.yahoo.com/*");
 
   EXPECT_TRUE(set.MatchesURL(GURL("http://www.google.com/monkey")));
   EXPECT_TRUE(set.MatchesURL(GURL("http://www.yahoo.com/monkey")));
   EXPECT_FALSE(set.MatchesURL(GURL("https://www.apple.com/monkey")));
 }
 
+TEST(URLPatternSetTest, StreamOperatorEmpty) {
+  URLPatternSet set;
+
+  std::ostringstream stream;

[Jeffrey Yasskin, 2014/05/28 22:32:04]

This should probably have an <sstream> include also.

[aboxhall, 2014/05/28 22:44:10]

Done.

+  stream << set;
+  EXPECT_EQ("{ }", stream.str());
+}
+
+TEST(URLPatternSetTest, StreamOperatorOne) {
+  URLPatternSet set;
+  AddPattern(&set, "http://www.google.com/*");
+
+  std::ostringstream stream;
+  stream << set;
+  EXPECT_EQ("{ \"http://www.google.com/*\" }", stream.str());
+}
+
+TEST(URLPatternSetTest, StreamOperatorTwo) {
+  URLPatternSet set;
+  AddPattern(&set, "http://www.google.com/*");
+  AddPattern(&set, "http://www.yahoo.com/*");
+
+  std::ostringstream stream;
+  stream << set;
+  EXPECT_EQ("{ \"http://www.google.com/*\", \"http://www.yahoo.com/*\" }",
+            stream.str());
+}
+
 TEST(URLPatternSetTest, OverlapsWith) {
   URLPatternSet set1;
   AddPattern(&set1, "http://www.google.com/f*");
   AddPattern(&set1, "http://www.yahoo.com/b*");
 
   URLPatternSet set2;
   AddPattern(&set2, "http://www.reddit.com/f*");
   AddPattern(&set2, "http://www.yahoo.com/z*");
 
   URLPatternSet set3;
@@ skipping 312 matching lines @@
     AddPattern(&expected, yahoo_b);
     AddPattern(&expected, yahoo_c);
     AddPattern(&expected, reddit_a);
     AddPattern(&expected, reddit_b);
     AddPattern(&expected, reddit_c);
     EXPECT_EQ(expected, result);
   }
 }
 
 }  // namespace extensions