1 files changed, 21 insertions, 0 deletions
diff --git a/testsuite/gna/issue1857/tb.vhdl b/testsuite/gna/issue1857/tb.vhdl
new file mode 100644
index 000000000..9e24b01d2
--- /dev/null
+++ b/testsuite/gna/issue1857/tb.vhdl
@@ -0,0 +1,21 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+--  A testbench has no ports.
+entity subtype_test_tb is
+end subtype_test_tb;
+
+architecture behav of subtype_test_tb is
+
+signal Data1 : unsigned (4-1 downto 0) := x"0";
+signal Data2 : unsigned (4-1 downto 0);
+
+begin
+    c_pwm : entity work.subtype_test
+        port map 
+        (
+            i_Data => Data1,
+            o_Data => Data2
+        );
+end behav;