Don't forget to re-initialize the particles before running the brute-force equivalent in test_125.

tests/test125cells.c

@@ -184,6 +184,18 @@ void get_solution(const struct cell *main_cell, struct solution_part *solution,
   }
 }
 
+void reset_particles(struct cell *c, enum velocity_field vel,
+                     enum pressure_field press, float size, float density) {
+
+  for (size_t i = 0; i < c->count; ++i) {
+
+    struct part *p = &c->parts[i];
+
+    set_velocity(p, vel, size);
+    set_energy_state(p, press, size, density);
+  }
+}
+
 /**
  * @brief Constructs a cell and all of its particle in a valid state prior to
  * a SPH time-step.
@@ -596,6 +608,9 @@ int main(int argc, char *argv[]) {
   /* Output timing */
   message("SWIFT calculation took       : %15lli ticks.", time / runs);
 
+  for (int j = 0; j < 125; ++j)
+    reset_particles(cells[j], vel, press, size, rho);
+
   /* NOW BRUTE-FORCE CALCULATION */
 
   const ticks tic = getticks();

tests/testPair.sh.in

 #!/bin/bash
-rm brute_force_standard.dat swift_dopair_standard.dat
+
+echo ""
+
+rm -f brute_force_standard.dat swift_dopair_standard.dat
 
 ./testPair -p 6 -r 1 -d 0 -f standard
 
-python @srcdir@/difffloat.py brute_force_standard.dat swift_dopair_standard.dat @srcdir@/tolerance_pair.dat
+python @srcdir@/difffloat.py brute_force_standard.dat swift_dopair_standard.dat @srcdir@/tolerance_pair_normal.dat
 
 exit $?

tests/testPairPerturbed.sh.in

 #!/bin/bash
-rm brute_force_perturbed.dat swift_dopair_perturbed.dat
+
+echo ""
+
+rm -f brute_force_perturbed.dat swift_dopair_perturbed.dat
 
 ./testPair -p 6 -r 1 -d 0.1 -f perturbed
 
-python @srcdir@/difffloat.py brute_force_perturbed.dat swift_dopair_perturbed.dat @srcdir@/tolerance_pair.dat
+python @srcdir@/difffloat.py brute_force_perturbed.dat swift_dopair_perturbed.dat @srcdir@/tolerance_pair_perturbed.dat
 
 exit $?

tests/testParser.sh.in

 #!/bin/bash
 
-rm parser_output.yml
+rm -f parser_output.yml
 ./testParser @srcdir@/testParserInput.yaml

tests/tolerance_27_perturbed.dat

 #   ID      pos_x      pos_y      pos_z        v_x        v_y        v_z           rho        rho_dh        wcount     wcount_dh         div_v       curl_vx       curl_vy       curl_vz
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1.2e-6     2e-6	    2e-5       2e-3		 2e-6	     2e-6	   2e-6		 2e-6
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      1e-6	    1e-5       1e-4		 2e-5	     1.5e-4	   1.5e-4	 1.5e-4
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1.2e-6     2e-6	    2.1e-5     2e-3		 2.1e-6	     2e-6	   2e-6		 2e-6
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      1e-6	    1e-5       1e-4		 2e-5	     4e-4	   4e-4	 	 4e-4

tests/tolerance_pair_perturbed.dat

+#   ID      pos_x      pos_y      pos_z        v_x        v_y        v_z           rho        rho_dh        wcount     wcount_dh         div_v       curl_vx       curl_vy       curl_vz
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-5	      1e-5	    2e-5       3e-2		 1e-5	     1e-5	   1e-5		 1e-5
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-3	      4e-4	    8e-3       2e-2		 1e-4	     1.6e-4	   1.6e-4	 1.6e-4