testsuite/synth: add a test for #938

1 files changed, 52 insertions, 0 deletions

diff --git a/testsuite/synth/issue938/tb_latches.vhdl b/testsuite/synth/issue938/tb_latches.vhdl
new file mode 100644
index 000000000..75e6e8c2f
--- /dev/null
+++ b/testsuite/synth/issue938/tb_latches.vhdl
@@ -0,0 +1,52 @@
+entity tb_latches is
+end tb_latches;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_latches is
+  signal g : std_logic;
+  signal d : std_logic;
+  signal clr : std_logic;
+  signal q : std_logic;
+begin
+  dut: entity work.latches
+    port map (g, d, clr, q);
+
+  process
+  begin
+    clr <= '1';
+    g <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    clr <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    g <= '1';
+    d <= '1';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    g <= '0';
+    d <= '0';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    g <= '1';
+    d <= '0';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+
+    g <= '1';
+    d <= '1';
+    wait for 1 ns;
+    assert q = '1' severity failure;
+
+    clr <= '1';
+    wait for 1 ns;
+    assert q = '0' severity failure;
+    wait;
+  end process;
+end behav;