FIX: unit test suite for connection

src/connection_m.fun

@@ -7,8 +7,6 @@
 test_suite connection_m
 
 ! Global variables declaration
-class(neuron_t), target :: n1
-class(neuron_t), target :: n2
 
 class(neuron_t), pointer :: n1_p
 class(neuron_t), pointer :: n2_p
@@ -25,11 +23,8 @@ setup
   write(*,*) '| SETUP BEFORE UNIT TEST |'
   write(*,*) '+------------------------+'
   write(*,*) 'Creating instances of the class mock_neuron_t...'
-  n1 = mock_neuron_t()
-  n2 = mock_neuron_t()
-  write(*,*) 'Assigning instances to pointer...'
-  n1_p => n1
-  n2_p => n2
+  n1_p => mock_neuron_t()
+  n2_p => mock_neuron_t()
   write(*,*) 'Creating an instance of the class interval_connection_t...'
   con => connection_t(n1_p, n2_p, 5.25)
   nullify(dummy_p)