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

chrome/browser/chromeos/policy/device_cloud_policy_initializer.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INITIALIZER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INITIALIZER_H_
 
 #include <bitset>
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/policy/server_backed_state_keys_broker.h"
 #include "components/policy/core/common/cloud/cloud_policy_client.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
 #include "components/policy/core/common/cloud/signing_service.h"
 
 class PrefService;
 
@@ skipping 66 matching lines @@
   // to be enrolled to as decided by factors such as forced re-enrollment,
   // enrollment recovery, or already-present install attributes. Note that
   // |config.management_domain| may be non-empty even if |config.mode| is
   // MODE_NONE.
   EnrollmentConfig GetPrescribedEnrollmentConfig() const;
 
   // CloudPolicyStore::Observer:
   void OnStoreLoaded(CloudPolicyStore* store) override;
   void OnStoreError(CloudPolicyStore* store) override;
 
+  // Allows testing code to set a signing service tailored to its needs.
+  void SetSigningServiceForTesting(policy::SigningService* signing_service);
+
  private:
-  // Signing class implemting the policy::SigningService interface to
+  // Signing class implementing the policy::SigningService interface to
   // sign data using the enrollment certificate's TPM-bound key.
   class TpmEnrollmentKeySigningService : public policy::SigningService {
    public:
     TpmEnrollmentKeySigningService(
         cryptohome::AsyncMethodCaller* async_method_caller);
     ~TpmEnrollmentKeySigningService();
 
     void SignData(const std::string& data,
                   const SigningCallback& callback) override;
 
@@ skipping 29 matching lines @@
   DeviceCloudPolicyManagerChromeOS* manager_;
   std::unique_ptr<chromeos::attestation::AttestationFlow> attestation_flow_;
   bool is_initialized_ = false;
 
   // Non-NULL if there is an enrollment operation pending.
   std::unique_ptr<EnrollmentHandlerChromeOS> enrollment_handler_;
 
   ServerBackedStateKeysBroker::Subscription state_keys_update_subscription_;
 
   // Our signing service.
-  TpmEnrollmentKeySigningService signing_service_;
+  SigningService* signing_service_;
+  std::unique_ptr<SigningService> default_signing_service_;

[pastarmovj, 2016/08/30 08:55:03]

Since there is no way of going back to the default once it is changed with the
setter I think it might be better to simply have the signing_service be a
unique_ptr and simply reset it with whatever comes in through the setter. The
ownership of the service will then be to the DCPI class at all times.
Alternatively make this a parameter to the constructor. WDYT?

[The one and only Dr. Crash, 2016/08/30 17:09:28]

Sure. Done.

 
   DISALLOW_COPY_AND_ASSIGN(DeviceCloudPolicyInitializer);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INITIALIZER_H_