1 files changed, 26 insertions, 0 deletions
diff --git a/testsuite/synth/issue40/tb_testcase.vhdl b/testsuite/synth/issue40/tb_testcase.vhdl
new file mode 100644
index 000000000..3ed89e61c
--- /dev/null
+++ b/testsuite/synth/issue40/tb_testcase.vhdl
@@ -0,0 +1,26 @@
+entity tb_testcase is
+end tb_testcase;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_testcase is
+  signal di : std_logic;
+  signal do : std_logic;
+begin
+  dut: entity work.testcase
+    port map (data_in => di, data_out => do);
+
+  process
+  begin
+    di <= '1';
+    wait for 1 ns;
+    assert do = '0' severity failure;
+    
+    di <= '0';
+    wait for 1 ns;
+    assert do = '1' severity failure;
+    
+    wait;
+  end process;
+end behav;