synth: add testcase for issue 34

1 files changed, 35 insertions, 0 deletions

diff --git a/testsuite/synth/issue34/tb_repro_sgn.vhdl b/testsuite/synth/issue34/tb_repro_sgn.vhdl
new file mode 100644
index 000000000..3961e6702
--- /dev/null
+++ b/testsuite/synth/issue34/tb_repro_sgn.vhdl
@@ -0,0 +1,35 @@
+entity tb_repro_sgn is
+end tb_repro_sgn;
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+architecture behav of tb_repro_sgn is
+  signal clk : std_logic;
+  signal a : signed(7 downto 0);
+  signal b : signed(7 downto 0);
+begin
+  dut: entity work.repro_sgn
+    port map (
+      clk => clk, a => a, b => b);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    a <= x"ab";
+    pulse;
+    assert b = x"ab" severity failure;
+
+    a <= x"12";
+    pulse;
+    assert b = x"12" severity failure;
+    wait;
+  end process;
+end behav;