diff --git a/include/caffe/solver.hpp b/include/caffe/solver.hpp
index a28d8cb897e..4bcf0fcd0fa 100644
--- a/include/caffe/solver.hpp
+++ b/include/caffe/solver.hpp
@@ -80,6 +80,10 @@ class Solver {
     virtual void on_start() = 0;
     virtual void on_gradients_ready() = 0;
 
+    virtual void on_test_start(int test_net_id) {}
+    virtual void on_test_end(int test_net_id) {}
+    virtual void on_test_iter_start(int test_net_id, int iter) {}
+
     template <typename T>
     friend class Solver;
   };
diff --git a/src/caffe/solver.cpp b/src/caffe/solver.cpp
index 044269371ad..c3a10dedc9e 100644
--- a/src/caffe/solver.cpp
+++ b/src/caffe/solver.cpp
@@ -331,11 +331,20 @@ void Solver<Dtype>::Test(const int test_net_id) {
             << ", Testing net (#" << test_net_id << ")";
   CHECK_NOTNULL(test_nets_[test_net_id].get())->
       ShareTrainedLayersWith(net_.get());
+
+  for (int i = 0; i < callbacks_.size(); ++i) {
+    callbacks_[i]->on_test_start(test_net_id);
+  }
+
   vector<Dtype> test_score;
   vector<int> test_score_output_id;
   const shared_ptr<Net<Dtype> >& test_net = test_nets_[test_net_id];
   Dtype loss = 0;
   for (int i = 0; i < param_.test_iter(test_net_id); ++i) {
+    for (int i = 0; i < callbacks_.size(); ++i) {
+      callbacks_[i]->on_test_iter_start(test_net_id, i);
+    }
+
     SolverAction::Enum request = GetRequestedAction();
     // Check to see if stoppage of testing/training has been requested.
     while (request != SolverAction::NONE) {
@@ -375,6 +384,11 @@ void Solver<Dtype>::Test(const int test_net_id) {
       }
     }
   }
+
+  for (int i = 0; i < callbacks_.size(); ++i) {
+    callbacks_[i]->on_test_end(test_net_id);
+  }
+
   if (requested_early_exit_) {
     LOG(INFO)     << "Test interrupted.";
     return;