Fix small detail in gtest

test/gtest_problem.cpp

@@ -338,19 +338,18 @@ TEST(Problem, perturb)
 
     Vector3d pose; pose << 0,0,0;
 
+    int i = 0;
     for (TimeStamp t = 0.0; t < 2.0; t += 1.0)
     {
-        for ( int i = 0; i < 2; i++)
+        auto F = problem->emplaceFrame(KEY, pose, t);
+        if (i==0) F->fix();
+
+        for (int j = 0; j< 2 ; j++)
         {
-            auto F = problem->emplaceFrame(KEY, pose, t);
-            if (i==0) F->fix();
-
-            for (int j = 0; j< 2 ; j++)
-            {
-                auto sb     = std::make_shared<StateBlock>(Vector3d(1,1,1));
-                auto cap    = CaptureBase::emplace<CaptureBase>(F, "CaptureBase", t, sensor, nullptr, nullptr, sb);
-            }
+            auto sb     = std::make_shared<StateBlock>(Vector3d(1,1,1));
+            auto cap    = CaptureBase::emplace<CaptureBase>(F, "CaptureBase", t, sensor, nullptr, nullptr, sb);
         }
+        i++;
     }
 
     for (int l = 0; l < 2; l++)