Add a run_tests build command without file output for CI

Author: mdurero

examples/ocaml/Makefile

@@ -88,7 +88,14 @@ test.exe: parser/fip.cmx mvalue.cmx ir.cmx test_harness.cmx
 
 # Running test suite
 run: test.bc
-	./test.bc "multi" $(TESTS_DIR) "results/y$(YEAR)"
+	./test.bc "multi" $(TESTS_DIR) "results/y_$(YEAR)"
+
+runfile: test.bc
+	./test.bc "raw" $(FILE) "results/f_$(notdir $(FILE))"
 
 runx: test.exe
-	./test.exe "multi" $(TESTS_DIR) "results/y$(YEAR)"
+	./test.exe "multi" $(TESTS_DIR) "results/y_$(YEAR)"
+
+# run_tests uses an empty string to disable the file output (output is enabled on stdout).
+run_tests: test.exe
+	./test.exe "multi" $(TESTS_DIR) ""

examples/ocaml/test_harness.ml

@@ -181,7 +181,10 @@ let run_test_directory (directory : string) (output_file_name : string) : unit =
     List.combine file_list
       (List.map compute_discrepancies_from_file_2020 file_list)
   in
-  let _oc = open_out (output_file_name ^ "_disc.txt") in
+  let _oc =
+    if String.length output_file_name = 0 then stdout
+    else open_out (output_file_name ^ "_disc.txt")
+  in
   let oc = Format.formatter_of_out_channel _oc in
   let print_discrepancy_report fmt files_discrepancies_list =
     Format.pp_print_list print_file_discrepancies fmt files_discrepancies_list