All DCP manager tests that enroll/register are tested with all auths.

components/policy/core/common/cloud/mock_signing_service.cc

Index: components/policy/core/common/cloud/mock_signing_service.cc
diff --git a/components/policy/core/common/cloud/mock_signing_service.cc b/components/policy/core/common/cloud/mock_signing_service.cc
index aece3a60d6cb86ffcf9a163de53f9f65b70247ad..e67bf8a15f323f7d71cb4a99843542f9b75a19ec 100644
--- a/components/policy/core/common/cloud/mock_signing_service.cc
+++ b/components/policy/core/common/cloud/mock_signing_service.cc
@@ -19,22 +19,17 @@ FakeSigningService::FakeSigningService() {}
 
 FakeSigningService::~FakeSigningService() {}
 
-void FakeSigningService::SignRegistrationData(
-      const em::CertificateBasedDeviceRegistrationData* registration_data,
-      em::SignedData* signed_data) {
-    DoSignData(registration_data->SerializeAsString(), signed_data);
-  }
-
 void FakeSigningService::SignData(const std::string& data,
                                   const SigningCallback& callback) {
   em::SignedData signed_data;
-  if (success_)
-    DoSignData(data, &signed_data);
+  if (success_) {
+    SignDataSynchronously(data, &signed_data);
+  }
   callback.Run(success_, signed_data);
 }
 
-void FakeSigningService::DoSignData(const std::string& data,
-                                    em::SignedData* signed_data) {
+void FakeSigningService::SignDataSynchronously(const std::string& data,
+    em::SignedData* signed_data) {
   signed_data->set_data(data + kSignedDataNonce);
   signed_data->set_signature(kSignature);
   signed_data->set_extra_data_bytes(sizeof(kSignedDataNonce) - 1);