Move function for classifying a string as a mime type into MimeUtil

net/base/mime_util_unittest.cc

Index: net/base/mime_util_unittest.cc
diff --git a/net/base/mime_util_unittest.cc b/net/base/mime_util_unittest.cc
index c647294a9c9c3db3662c111b26b888cbb7523381..0fe0f5e8060587c1763b244d06d30dcf68b88591 100644
--- a/net/base/mime_util_unittest.cc
+++ b/net/base/mime_util_unittest.cc
@@ -126,4 +126,28 @@ TEST(MimeUtilTest, ParseCodecString) {
   EXPECT_EQ("mp4a.40.2", codecs_out[1]);
 }
 
+TEST(MimeUtilTest, TestIsStringMimeType) {
+  std::string nonAscii("application/nonutf8");
+  EXPECT_TRUE(IsStringMimeType(nonAscii));
+  nonAscii.append("\u2603");  // unicode snowman
+  EXPECT_FALSE(IsStringMimeType(nonAscii));
+
+  EXPECT_TRUE(IsStringMimeType("application/mime"));
+  EXPECT_TRUE(IsStringMimeType("audio/mime"));
+  EXPECT_TRUE(IsStringMimeType("example/mime"));
+  EXPECT_TRUE(IsStringMimeType("image/mime"));
+  EXPECT_TRUE(IsStringMimeType("message/mime"));
+  EXPECT_TRUE(IsStringMimeType("model/mime"));
+  EXPECT_TRUE(IsStringMimeType("multipart/mime"));
+  EXPECT_TRUE(IsStringMimeType("text/mime"));
+  EXPECT_TRUE(IsStringMimeType("video/mime"));
+  EXPECT_TRUE(IsStringMimeType("video/mime;parameter"));
+  EXPECT_TRUE(IsStringMimeType("*/*"));
+  EXPECT_TRUE(IsStringMimeType("*"));
+
+  EXPECT_TRUE(IsStringMimeType("x-video/mime"));
+  EXPECT_FALSE(IsStringMimeType("x-/mime"));
+  EXPECT_FALSE(IsStringMimeType("mime/looking"));
+}
+
 }  // namespace net