diff --git a/test/gtest_factor_inertial_kinematics.cpp b/test/gtest_factor_inertial_kinematics.cpp
index bebfa15f6b75e9b668ea8b91e7fcdf977bcaeb03..095e702fac013b2cea83817f0902aca981b02fa7 100644
--- a/test/gtest_factor_inertial_kinematics.cpp
+++ b/test/gtest_factor_inertial_kinematics.cpp
@@ -58,6 +58,8 @@ using namespace wolf;
 using namespace Eigen;
 using namespace std;
 
+const Vector3d ZERO3 = Vector3d::Zero();
+const Vector6d ZERO6 = Vector6d::Zero();
 
 class FactorInertialKinematics_1KF : public testing::Test
 {
@@ -74,9 +76,10 @@ class FactorInertialKinematics_1KF : public testing::Test
         SensorInertialKinematicsPtr SIK_;
         CaptureInertialKinematicsPtr CIK0_;
         Eigen::Matrix3d Qp_, Qv_, Qw_;
-        Eigen::Vector3d bias_p_, bias_imu_;
         FeatureInertialKinematicsPtr feat_in_;
         StateBlockPtr sbbimu_;
+        Vector3d bias_p_;
+        Vector6d bias_imu_;
 
     virtual void SetUp()
     {
@@ -101,13 +104,11 @@ class FactorInertialKinematics_1KF : public testing::Test
         SIK_ = std::make_shared<SensorInertialKinematics>(Eigen::VectorXd(0), intr_ik);
 
         // ADD THE STATEBLOCKS AND SET THEIR DEFAULT VALUES
-        Vector3d zero3; zero3 << 0,0,0;
-        Vector6d zero6; zero6 << zero3, zero3;
-        Vector3d bias_p_ = zero3;
-        Vector6d bias_imu_ = zero6;
-        StateBlockPtr sbc = make_shared<StateBlock>(zero3);
-        StateBlockPtr sbd = make_shared<StateBlock>(zero3);
-        StateBlockPtr sbL = make_shared<StateBlock>(zero3);
+        bias_p_ = ZERO3;
+        bias_imu_ = ZERO6;
+        StateBlockPtr sbc = make_shared<StateBlock>(ZERO3);
+        StateBlockPtr sbd = make_shared<StateBlock>(ZERO3);
+        StateBlockPtr sbL = make_shared<StateBlock>(ZERO3);
         StateBlockPtr sbb = make_shared<StateBlock>(bias_p_);
         sbbimu_ = make_shared<StateBlock>(bias_imu_);
 
@@ -121,13 +122,13 @@ class FactorInertialKinematics_1KF : public testing::Test
 
         // =============== SET DEFAULT" KIN MEASUREMENT AND COVARIANCE
         // Measurements
-        Vector3d pBC_meas = zero3;
-        Vector3d vBC_meas = zero3;
-        Vector3d w_meas = zero3;
+        Vector3d pBC_meas = ZERO3;
+        Vector3d vBC_meas = ZERO3;
+        Vector3d w_meas = ZERO3;
 
         // momentum parameters
         Matrix3d Iq; Iq.setIdentity();
-        Vector3d Lq = zero3;
+        Vector3d Lq = ZERO3;
 
         Qp_ = pow(1e-2, 2)*Eigen::Matrix3d::Identity();
         Qv_ = pow(1e-2, 2)*Eigen::Matrix3d::Identity();
@@ -150,15 +151,15 @@ class FactorInertialKinematics_1KF_Meas0_bpfix : public FactorInertialKinematics
         // Fix the bp bias
         CIK0_->getStateBlock("I")->fix();
         KF0_->getStateBlock("C")->unfix();
-        Eigen::Vector3d zero3 = Eigen::Vector3d::Zero();
+        Eigen::Vector3d ZERO3 = Eigen::Vector3d::Zero();
 
-        Eigen::Vector3d pBC_meas = zero3;
-        Eigen::Vector3d vBC_meas = zero3;
-        Eigen::Vector3d w_meas = zero3;
+        Eigen::Vector3d pBC_meas = ZERO3;
+        Eigen::Vector3d vBC_meas = ZERO3;
+        Eigen::Vector3d w_meas = ZERO3;
         Eigen::Vector9d meas; meas << pBC_meas, vBC_meas, w_meas;
         // momentum parameters
         Eigen::Matrix3d Iq; Iq.setIdentity();
-        Eigen::Vector3d Lq = zero3;
+        Eigen::Vector3d Lq = ZERO3;
 
         // =============== CREATE FEATURE/FACTOR
         Eigen::Matrix9d Q_ikin_err = computeIKinCov(Qp_, Qv_, Qw_, meas.head<3>()-bias_p_, meas.tail<3>()-bias_imu_.tail<3>(), Iq);
@@ -175,15 +176,15 @@ class FactorInertialKinematics_1KF_1p_bpfix : public FactorInertialKinematics_1K
         // Fix the bp bias
         CIK0_->getStateBlock("I")->fix();
         KF0_->getStateBlock("C")->unfix();
-        Eigen::Vector3d zero3 = Eigen::Vector3d::Zero();
+        Eigen::Vector3d ZERO3 = Eigen::Vector3d::Zero();
 
         Eigen::Vector3d pBC_meas; pBC_meas << 1,0,0;
-        Eigen::Vector3d vBC_meas = zero3;
-        Eigen::Vector3d w_meas = zero3;
+        Eigen::Vector3d vBC_meas = ZERO3;
+        Eigen::Vector3d w_meas = ZERO3;
         Eigen::Vector9d meas; meas << pBC_meas, vBC_meas, w_meas;
         // momentum parameters
         Eigen::Matrix3d Iq; Iq.setIdentity();
-        Eigen::Vector3d Lq = zero3;
+        Eigen::Vector3d Lq = ZERO3;
 
         // =============== CREATE FEATURE/FACTOR
         Eigen::Matrix9d Q_ikin_err = computeIKinCov(Qp_, Qv_, Qw_, meas.head<3>()-bias_p_, meas.tail<3>()-bias_imu_.tail<3>(), Iq);
@@ -200,16 +201,16 @@ class FactorInertialKinematics_1KF_m1p_pfix : public FactorInertialKinematics_1K
         // Fix the COM position
         CIK0_->getStateBlock("I")->unfix();
         KF0_->getStateBlock("C")->fix();
-        Eigen::Vector3d zero3 = Eigen::Vector3d::Zero();
+        Eigen::Vector3d ZERO3 = Eigen::Vector3d::Zero();
 
         Eigen::Vector3d pBC_meas; pBC_meas << 1,0,0;
-        Eigen::Vector3d vBC_meas = zero3;
-        Eigen::Vector3d w_meas = zero3;
+        Eigen::Vector3d vBC_meas = ZERO3;
+        Eigen::Vector3d w_meas = ZERO3;
         bias_p_ << 1,0,0;
         Eigen::Vector9d meas; meas << pBC_meas, vBC_meas, w_meas;
         // momentum parameters
         Eigen::Matrix3d Iq; Iq.setIdentity();
-        Eigen::Vector3d Lq = zero3;
+        Eigen::Vector3d Lq = ZERO3;
 
         // =============== CREATE FEATURE/FACTOR
         Eigen::Matrix9d Q_ikin_err = computeIKinCov(Qp_, Qv_, Qw_, meas.head<3>()-bias_p_, meas.tail<3>()-bias_imu_.tail<3>(), Iq);
@@ -224,19 +225,19 @@ class FactorInertialKinematics_1KF_1v_bfix : public FactorInertialKinematics_1KF
     {
         FactorInertialKinematics_1KF::SetUp();
         // Fix the bp bias
-        Eigen::Vector3d zero3 = Eigen::Vector3d::Zero();
+        Eigen::Vector3d ZERO3 = Eigen::Vector3d::Zero();
         CIK0_->getStateBlock("I")->fix();
         KF0_->getStateBlock("C")->unfix();
-        bias_p_ = zero3;
+        bias_p_ = ZERO3;
         CIK0_->getStateBlock("I")->setState(bias_p_);
 
-        Eigen::Vector3d pBC_meas = zero3;
+        Eigen::Vector3d pBC_meas = ZERO3;
         Eigen::Vector3d vBC_meas; vBC_meas << 1,0,0;
-        Eigen::Vector3d w_meas = zero3;
+        Eigen::Vector3d w_meas = ZERO3;
         Eigen::Vector9d meas; meas << pBC_meas, vBC_meas, w_meas;
         // momentum parameters
         Eigen::Matrix3d Iq; Iq.setIdentity();
-        Eigen::Vector3d Lq = zero3;
+        Eigen::Vector3d Lq = ZERO3;
 
         // =============== CREATE FEATURE/FACTOR
         Eigen::Matrix9d Q_ikin_err = computeIKinCov(Qp_, Qv_, Qw_, meas.head<3>()-bias_p_, meas.tail<3>()-bias_imu_.tail<3>(), Iq);
@@ -303,13 +304,13 @@ class FactorInertialKinematics_1KF_1v_bfix : public FactorInertialKinematics_1KF
 //
 //
 //        // ADD THE STATEBLOCKS AND SET THEIR DEFAULT VALUES
-//        Vector3d zero3; zero3 << 0,0,0;
-//        Vector6d zero6; zero6 << zero3, zero3;
-//        Vector3d bias_p_ = zero3;
-//        Vector6d bias_imu_ = zero6;
-//        StateBlockPtr sbc = make_shared<StateBlock>(zero3);
-//        StateBlockPtr sbd = make_shared<StateBlock>(zero3);
-//        StateBlockPtr sbL = make_shared<StateBlock>(zero3);
+//        Vector3d ZERO3; ZERO3 << 0,0,0;
+//        Vector6d ZERO6; ZERO6 << ZERO3, ZERO3;
+//        Vector3d bias_p_ = ZERO3;
+//        Vector6d bias_imu_ = ZERO6;
+//        StateBlockPtr sbc = make_shared<StateBlock>(ZERO3);
+//        StateBlockPtr sbd = make_shared<StateBlock>(ZERO3);
+//        StateBlockPtr sbL = make_shared<StateBlock>(ZERO3);
 //        StateBlockPtr sbb = make_shared<StateBlock>(bias_p_);
 //
 //        KF0_->addStateBlock("C", sbcproblem_);
@@ -323,13 +324,13 @@ class FactorInertialKinematics_1KF_1v_bfix : public FactorInertialKinematics_1KF
 //
 //        // =============== SET DEFAULT" KIN MEASUREMENT AND COVARIANCE
 //        // Measurements
-//        Vector3d pBC_meas = zero3;
-//        Vector3d vBC_meas = zero3;
-//        Vector3d w_meas = zero3;
+//        Vector3d pBC_meas = ZERO3;
+//        Vector3d vBC_meas = ZERO3;
+//        Vector3d w_meas = ZERO3;
 //
 //        // momentum parameters
 //        Matrix3d Iq; Iq.setIdentity();
-//        Vector3d Lq = zero3;
+//        Vector3d Lq = ZERO3;
 //
 //        Qp_ = pow(1e-2, 2)*Eigen::Matrix3d::Identity();
 //        Qv_ = pow(1e-2, 2)*Eigen::Matrix3d::Identity();