Check that usage isn't empty when generateKey() is called

content/child/webcrypto/test/aes_kw_unittest.cc

 // Copyright 2014 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 "base/stl_util.h"
 #include "content/child/webcrypto/algorithm_dispatch.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/test/test_helpers.h"
 #include "content/child/webcrypto/webcrypto_util.h"
@@ skipping 16 matching lines @@
   const unsigned short kKeyLen[] = {0, 127, 257};
   blink::WebCryptoKey key;
   for (size_t i = 0; i < arraysize(kKeyLen); ++i) {
     SCOPED_TRACE(i);
     EXPECT_EQ(Status::ErrorGenerateAesKeyLength(),
               GenerateSecretKey(CreateAesKwKeyGenAlgorithm(kKeyLen[i]), true, 0,
                                 &key));
   }
 }
 
+TEST(WebCryptoAesKwTest, GenerateKeyEmptyUsage) {
+  blink::WebCryptoKey key;
+  EXPECT_EQ(Status::ErrorCreateKeyEmptyUsages(),
+            GenerateSecretKey(CreateAesKwKeyGenAlgorithm(256), true, 0, &key));
+}
+
 TEST(WebCryptoAesKwTest, ImportKeyJwkKeyOpsWrapUnwrap) {
   blink::WebCryptoKey key;
   base::DictionaryValue dict;
   dict.SetString("kty", "oct");
   dict.SetString("k", "GADWrMRHwQfoNaXU5fZvTg");
   base::ListValue* key_ops = new base::ListValue;
   dict.Set("key_ops", key_ops);  // Takes ownership.
 
   key_ops->AppendString("wrapKey");
 
@@ skipping 465 matching lines @@
                             blink::WebCryptoAlgorithmIdSha256),
                         true, bad_usages[i], &key));
   }
 }
 
 }  // namespace
 
 }  // namespace webcrypto
 
 }  // namespace content