Suppress pause-and-buffer behavior when the HTTP response won't satisfy future requests via cache.

webkit/media/cache_util_unittest.cc

Index: webkit/media/cache_util_unittest.cc
diff --git a/webkit/media/cache_util_unittest.cc b/webkit/media/cache_util_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..808084aa03982b21d32dadf6171e5d4b2680c492
--- /dev/null
+++ b/webkit/media/cache_util_unittest.cc
@@ -0,0 +1,97 @@
+// 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 "webkit/media/cache_util.h"
+
+#include <string>
+
+#include "base/format_macros.h"
+#include "base/stringprintf.h"
+#include "base/string_number_conversions.h"
+#include "base/string_util.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLResponse.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using WebKit::WebString;
+using WebKit::WebURLResponse;
+
+namespace webkit_media {
+
+// Inputs & expected output for GetReasonsForUncacheability.
+struct GRFUTestCase {
+  WebURLResponse::HTTPVersion version;
+  int status_code;
+  const char* headers;
+  uint32 expected_reasons;
+};
+
+// Create a new WebURLResponse object.
+static WebURLResponse CreateResponse(const GRFUTestCase& test) {
+  WebURLResponse response;
+  response.initialize();
+  response.setHTTPVersion(test.version);
+  response.setHTTPStatusCode(test.status_code);
+  std::vector<std::string> lines;
+  Tokenize(test.headers, "\n", &lines);
+  for (size_t i = 0; i < lines.size(); ++i) {
+    size_t colon = lines[i].find(": ");
+    response.addHTTPHeaderField(
+        WebString::fromUTF8(lines[i].substr(0, colon)),
+        WebString::fromUTF8(lines[i].substr(colon + 2)));
+  }
+  return response;
+}
+
+TEST(CacheUtilTest, GetReasonsForUncacheability) {
+  enum { kNoReasons = 0 };
+
+  const GRFUTestCase tests[] = {
+    {
+      WebURLResponse::HTTP_1_1, 206, "ETag: 'fooblort'", kNoReasons
+    },
+    {
+      WebURLResponse::HTTP_1_1, 206, "", kNoStrongValidatorOnPartialResponse
+    },
+    {
+      WebURLResponse::HTTP_1_0, 206, "",
+      kPre11PartialResponse | kNoStrongValidatorOnPartialResponse
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200, "cache-control: max-Age=42", kShortMaxAge
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200, "cache-control: max-Age=4200", kNoReasons
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200,
+      "Date: Tue, 22 May 2012 23:46:08 GMT\n"
+      "Expires: Tue, 22 May 2012 23:56:08 GMT", kExpiresTooSoon
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200, "cache-control: must-revalidate",
+      kHasMustRevalidate
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200, "cache-control: no-cache", kNoCache
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200, "cache-control: no-store", kNoStore
+    },
+    {
+      WebURLResponse::HTTP_1_1, 200,
+      "cache-control: no-cache\ncache-control: no-store", kNoCache | kNoStore
+    },
+  };
+  for (size_t i = 0; i < arraysize(tests); ++i) {
+    SCOPED_TRACE(StringPrintf("case: %" PRIuS
+                              ", version: %d, code: %d, headers: %s",
+                              i, tests[i].version, tests[i].status_code,
+                              tests[i].headers));
+    EXPECT_EQ(GetReasonsForUncacheability(CreateResponse(tests[i])),
+              tests[i].expected_reasons);
+  }
+}
+
+}  // namespace webkit_media