diff --git a/fhem/t/FHEM/Core/Utils/00_func_Math.t b/fhem/t/FHEM/Core/Utils/00_func_Math.t
new file mode 100644
index 000000000..9b20121cb
--- /dev/null
+++ b/fhem/t/FHEM/Core/Utils/00_func_Math.t
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use Test2::V0;
+use Test2::Tools::Compare qw{is};
+
+use FHEM::Core::Utils::Math;
+
+subtest 'Round to three decimals after dot' => sub {
+ 	is (FHEM::Core::Utils::Math::round(100/3,3),33.333,'round returned three decimals after dot');
+};
+
+subtest 'Round negative, to one decimals after dot' => sub {
+ 	is (FHEM::Core::Utils::Math::round(-100/3,1),-33.3,'round returned one decimals after dot');
+};
+
+subtest 'Round negative, to no decimals after dot' => sub {
+ 	is (FHEM::Core::Utils::Math::round(100/3,0),33,'round returned zero decimals after dot');
+};
+
+subtest 'No decimals specified' => sub {
+ 	is (FHEM::Core::Utils::Math::round(100/3),U(),'round returned undef');
+};
+
+
+subtest 'No value specified' => sub {
+ 	is (FHEM::Core::Utils::Math::round(),U(),'round returned undef');
+};
+
+done_testing();
+exit(0);
+1;
\ No newline at end of file