Test 05 for --timestamp-format extended with two negativ tests

ci/test-05-options-c-e.pl

@@ -1,6 +1,6 @@
 #!/usr/bin/perl -w
 
-use Test::Command tests => 42;
+use Test::Command tests => 48;
 
 #  -c n       count of pings to send to each target (default 1)
 #  -C n       same as -c, report results in verbose format
@@ -174,6 +174,22 @@
 });
 }
 
+# fping -D --timestamp-format
+{
+my $cmd = Test::Command->new(cmd => "fping -D --timestamp-format -c 2 -p 100 127.0.0.1");
+$cmd->exit_is_num(1);
+$cmd->stdout_is_eq("");
+$cmd->stderr_like(qr{Usage:});
+}
+
+# fping -D --timestamp-format="%Y-%m-%d %H:%M:%S"
+{
+my $cmd = Test::Command->new(cmd => "fping -D --timestamp-format=\"%Y-%m-%d %H:%M:%S\" -c 2 -p 100 127.0.0.1");
+$cmd->exit_is_num(1);
+$cmd->stdout_is_eq("");
+$cmd->stderr_like(qr{Usage:});
+}
+
 # fping -e
 {
 my $cmd = Test::Command->new(cmd => "fping -e 127.0.0.1");