AU: detect failure when using public key verification

delta_performer_unittest.cc

Index: delta_performer_unittest.cc
diff --git a/delta_performer_unittest.cc b/delta_performer_unittest.cc
index 0c2d9b9a1dd25c56c65c34c10508ecd21725ebd8..a90367db18e4ee35972cf2f047edca6d23ba681d 100755
--- a/delta_performer_unittest.cc
+++ b/delta_performer_unittest.cc
@@ -450,18 +450,23 @@ void DoSmallImageTest(bool full_kernel, bool full_rootfs, bool noop,
                        strlen(new_data_string)));
 
   EXPECT_TRUE(utils::FileExists(kUnittestPublicKeyPath));
-  bool expect_verify_success =
-      signature_test != kSignatureNone &&
-      signature_test != kSignatureGeneratedShellBadKey;
+  const bool expect_verify_success =
+      signature_test != kSignatureNone;
+  const bool expect_public_verify_failure =
+      signature_test == kSignatureGeneratedShellBadKey;
+  bool public_verify_failure = false;
   EXPECT_EQ(expect_verify_success,
             performer.VerifyPayload(
                 kUnittestPublicKeyPath,
                 OmahaHashCalculator::OmahaHashOfData(delta),
-                delta.size()));
+                delta.size(),
+                &public_verify_failure));
+  EXPECT_EQ(expect_public_verify_failure, public_verify_failure);
   EXPECT_TRUE(performer.VerifyPayload(
       "/public/key/does/not/exists",
       OmahaHashCalculator::OmahaHashOfData(delta),
-      delta.size()));
+      delta.size(),
+      NULL));
 
   uint64_t new_kernel_size;
   vector<char> new_kernel_hash;