testsuite/synth: add a test for #1166

1 files changed, 45 insertions, 0 deletions

diff --git a/testsuite/synth/issue1166/tb_ent.vhdl b/testsuite/synth/issue1166/tb_ent.vhdl
new file mode 100644
index 000000000..016f6b685
--- /dev/null
+++ b/testsuite/synth/issue1166/tb_ent.vhdl
@@ -0,0 +1,45 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity tb_ent is
+end;
+
+architecture a of tb_ent is
+    signal a, enable, d_in, d_out : std_logic;
+begin
+    uut: entity work.ent
+        port map (
+            a => a,
+            enable => enable,
+            d_in => d_in,
+            d_out => d_out
+        );
+
+    process
+    begin
+        a <= '0';
+        enable <= '0';
+
+        wait for 10 ns;
+        assert d_out = '0';
+
+        a <= '1';
+
+        wait for 10 ns;
+        assert d_out = '1' severity failure;
+
+        enable <= '1';
+        a <= 'Z';
+        d_in <= '0';
+
+        wait for 10 ns;
+        assert a = '0' severity failure;
+
+        d_in <= '1';
+
+        wait for 10 ns;
+        assert a = '1' severity failure;
+
+        wait;
+    end process;
+end;