[test suite] rm previous coverage files in coverage mode when --include criteria is not used

Makefile.am

@@ -455,6 +455,7 @@ EXTRA_DIST = \
     test/configure_max_coverage.sh \
     test/gen-coverage-report.sh \
     test/init-lcov.sh \
+    test/rm-coverage-files.sh \
     test/lcov.env \
     test/configure_max_coverage.sh \
     test/README \

test/init-lcov.sh

@@ -4,6 +4,9 @@
 
 cd ..
 [ ! -d $TOP_DIR ] && mkdir $TOP_DIR
+[ -f $LCOV_BASE ] && rm -f $LCOV_BASE
+[ -f $LCOV_INFO ] && rm -f $LCOV_INFO
+[ -f $LCOV_INFO_FINAL ] && rm -f $LCOV_INFO_FINAL
 [ -d $LCOV_RESULTS_DIR ] && rm -rf $LCOV_RESULTS_DIR
 [ ! -d $LCOV_RESULTS_DIR ] && mkdir $LCOV_RESULTS_DIR
 

test/rm-coverage-files.sh

@@ -0,0 +1,12 @@
+#!/bin/sh -x
+
+cd ..
+for d in client server lib
+do
+    for s in *.gcda *.gcno *.gcov
+    do
+        find $d -name $s | xargs rm -f
+    done
+done
+cd test
+exit

test/test-fwknop.pl

@@ -247,6 +247,8 @@ my $enable_profile_coverage_check = 0;
 my $enable_profile_coverage_init = 0;
 my $profile_gen_report_sh = './gen-coverage-report.sh';
 my $profile_init_sh = './init-lcov.sh';
+my $profile_rm_files_sh = './rm-coverage-files.sh';
+my $do_rm_coverage_files = 0;
 my $enable_make_distcheck = 0;
 my $enable_perl_module_checks = 0;
 my $enable_perl_module_fuzzing_spa_pkt_generation = 0;
@@ -6888,6 +6890,8 @@ sub init() {
     unlink $init_file if -e $init_file;
     unlink $logfile   if -e $logfile;
 
+    $do_rm_coverage_files = 1 unless @tests_to_include;
+
     ### always restore the gpg directories before tests are
     ### executed
     &restore_gpg_dirs();
@@ -7115,6 +7119,10 @@ sub init() {
                     print "[-] Warning: --enable-profile-coverage not ",
                         "found, use ./configure --enable-profile-coverage?\n";
                 }
+                if ($do_rm_coverage_files) {
+                    &run_cmd($profile_rm_files_sh, $cmd_out_tmp,
+                        $curr_test_file);
+                }
                 &run_cmd($profile_init_sh, $cmd_out_tmp, $curr_test_file);
             }
             push @tests_to_exclude, qr/distcheck/;