diff --git a/t/01_testssl_banner.t b/t/01_testssl_banner.t
index 4eccadd..f68d6df 100755
--- a/t/01_testssl_banner.t
+++ b/t/01_testssl_banner.t
@@ -14,7 +14,6 @@ my $error_regexp2='testssl.sh: line';
 my $error_regexp3='bash: warning';
 my $error_regexp4='command not found';
 my $error_regexp5='(syntax error|unexpected token)';
-# my $good_regexp='free software.*USAGE w/o ANY WARRANTY.*OWN RISK.*Using.*ciphers.*built(.*)platform';
 my $good_regexp='free software([\s\S]*)USAGE w/o ANY WARRANTY([\s\S]*)OWN RISK([\s\S]*)Using([\s\S]*)ciphers([\s\S]*)built([\s\S]*)platform';
 
 printf "\n%s\n", "Testing whether just calling \"./testssl.sh --banner\" produces no error ...";
diff --git a/t/03_set-x.t b/t/03_set-x.t
new file mode 100755
index 0000000..abd8645
--- /dev/null
+++ b/t/03_set-x.t
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+
+# Basics: is there a synatx error where already bash hiccups on?
+# --banner is equal to --version
+
+use strict;
+use Test::More;
+
+my $tests = 0;
+my $fileout="";
+# Blacklists we use to trigger an error:
+my $error_regexp='^(\|)+([0-9])+>\s+[a-z]';
+
+printf "\n%s\n", "Testing whether we forgot \"set -x\" ...";
+$fileout = `./testssl.sh --help 2>&1`;
+my $retval=$?;
+
+unlike($fileout, qr/$error_regexp/, "just ran help");
+$tests++;
+
+$fileout = `./testssl.sh --ssl-native --color=0 --fast --ip=one google.com 2>&1`;
+unlike($fileout, qr/$error_regexp/, "ran --ssl-native --color=0 --fast --ip=one google.com");
+$tests++;
+
+printf "\n";
+done_testing($tests);
+
+
diff --git a/t/07_isJSON_valid.t b/t/07_isJSON_valid.t
index abba0f4..26814b8 100755
--- a/t/07_isJSON_valid.t
+++ b/t/07_isJSON_valid.t
@@ -22,6 +22,7 @@ die "Unable to open $prg" unless -f $prg;
 my $uri="cloudflare.com";
 
 printf "\n%s\n", "Unit testing JSON output ...";
+unlink 'tmp.json';
 
 #1
 printf "%s\n", ".. plain JSON --> $uri ";
diff --git a/t/08_isHTML_valid.t b/t/08_isHTML_valid.t
index f8877a8..4642435 100755
--- a/t/08_isHTML_valid.t
+++ b/t/08_isHTML_valid.t
@@ -19,6 +19,7 @@ my $check2run="--color 0 --htmlfile tmp.html";
 die "Unable to open $prg" unless -f $prg;
 
 printf "\n%s\n", "Doing HTML output checks";
+unlink 'tmp.html';
 
 #1
 printf "%s\n", " .. running $prg against $uri to create HTML and terminal outputs (may take 2~3 minutes)";
diff --git a/t/09_isJSON_severitylevel_valid.t b/t/09_isJSON_severitylevel_valid.t
index ab78d94..e39d6ab 100755
--- a/t/09_isJSON_severitylevel_valid.t
+++ b/t/09_isJSON_severitylevel_valid.t
@@ -17,6 +17,7 @@ $tests = 0;
 
 
 printf "\n%s\n", "Doing severity level checks";
+unlink 'tmp.json';
 
 #1
 pass(" .. running testssl.sh against badssl.com to create a JSON report with severity level equal greater than LOW (may take 2~3 minutes)"); $tests++;