[ios] EarlGrey test for PDF Mime type.

ios/web/shell/test/pdf_egtest.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 "ios/web/public/test/http_server.h"
+#include "ios/web/public/test/http_server_util.h"
+#include "ios/web/shell/test/app/navigation_test_util.h"
+#import "ios/web/shell/test/earl_grey/shell_base_test_case.h"
+#import "ios/web/shell/test/earl_grey/shell_matchers.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+// URL spec for test PDF page.
+const char kTestPDFURL[] =
+    "http://ios/web/shell/test/http_server_files/testpage.pdf";
+}  // namespace
+
+using web::shell_test_util::LoadUrl;
+using web::test::HttpServer;
+
+// PDF test cases for the web shell.
+@interface PDFTest : ShellBaseTestCase
+@end
+
+@implementation PDFTest
+
+// Tests MIME type of the loaded PDF document.
+- (void)testMIMEType {
+  web::test::SetUpFileBasedHttpServer();
+  LoadUrl(HttpServer::MakeUrl(kTestPDFURL));
+  [[EarlGrey selectElementWithMatcher:web::webViewMimeType("application/pdf")]

[baxley, 2016/07/26 18:21:36]

Do you think this method is useful as a helper, where you put it?

1. If it's useful to other tests, it should definitely be in the utilities.
2. If it's super specific to this test then it shouldn't.
3. If it's generally useful, but we don't know how widespread I'm fine with
sharing it.

As long as it's not the second example I gave, I think it is fine as is.

[Eugene But (OOO till 7-30), 2016/07/27 01:15:46]

I don't know the answer. I've made webViewInWebState public and webViewMimeType
local. We can always refactor later and make webViewMimeType public if
necessary.

Let me know if you want to have webViewInCurrentWebState in shell_matchers.h.

+      assertWithMatcher:grey_notNil()];
+}
+
+@end