testsuite/synth: add testcase for #964

1 files changed, 55 insertions, 0 deletions

diff --git a/testsuite/synth/issue964/tb_ent.vhdl b/testsuite/synth/issue964/tb_ent.vhdl
new file mode 100644
index 000000000..76cbf8b31
--- /dev/null
+++ b/testsuite/synth/issue964/tb_ent.vhdl
@@ -0,0 +1,55 @@
+entity tb_ent is
+end tb_ent;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_ent is
+  signal clk : std_logic;
+  signal dout : std_logic;
+  signal enable : std_logic;
+  signal reset : std_logic;
+begin
+  dut: entity work.ent
+    port map (
+      enable => enable,
+      reset => reset,
+      q => dout,
+      clk => clk);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    enable <= '1';
+    reset <= '1';
+    pulse;
+    assert dout = '0' severity failure;
+
+    enable <= '1';
+    reset <= '0';
+    pulse;
+    assert dout = '1' severity failure;
+
+    pulse;
+    assert dout = '0' severity failure;
+
+    pulse;
+    assert dout = '1' severity failure;
+
+    enable <= '0';
+    pulse;
+    assert dout = '1' severity failure;
+
+    enable <= '1';
+    pulse;
+    assert dout = '0' severity failure;
+
+    wait;
+  end process;
+end behav;