fixed gtest with valid ts

test/gtest_processor_imu.cpp

@@ -61,6 +61,7 @@ class ProcessorImut : public testing::Test
         processor_motion = std::static_pointer_cast<ProcessorMotion>(processor_ptr);
 
         // Time and data variables
+        t.set(0);
         data = Vector6d::Zero();
         data_cov = Matrix6d::Identity();