Fix missing main in PAF test

psrdada_cpp/effelsberg/paf/test/src/UnpackerTester.cu

 #include "psrdada_cpp/effelsberg/paf/test/UnpackerTester.cuh"
+#include "psrdada_cpp/cli_utils.hpp"
 #include "psrdada_cpp/cuda_utils.hpp"
 #include <random>
 
@@ -83,3 +84,16 @@ TEST_F(UnpackerTester, paf_unpack_test)
 } //namespace paf
 } //namespace meerkat
 } //namespace psrdada_cpp
+
+
+int main(int argc, char **argv) {
+  char * val = getenv("LOG_LEVEL");
+  if ( val )
+  {
+      psrdada_cpp::set_log_level(val);
+  }
+
+  ::testing::InitGoogleTest(&argc, argv);
+
+  return RUN_ALL_TESTS();
+}