From 3200946bb95eb65e608bfa9558515f3eba05fe90 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Sun, 13 Sep 2026 13:17:15 -0400
Subject: [PATCH] Tests: Improve t_string_to_bit

---
 test_regress/t/t_string_to_bit.v | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/test_regress/t/t_string_to_bit.v b/test_regress/t/t_string_to_bit.v
index 0e1f0cff4..4519ae27f 100644
--- a/test_regress/t/t_string_to_bit.v
+++ b/test_regress/t/t_string_to_bit.v
@@ -18,47 +18,57 @@ module t (
   string str0;
   string str1;
   string str2;
+  string str3;
 
   typedef bit [31:0] bit_t;
   typedef logic [31:0] logic_t;
   typedef bit [55:0] quad_t;
   typedef bit [87:0] wide_t;
 
-  bit_t bdata[3];
-  bit_t ldata[3];
-  quad_t qdata[3];
-  wide_t wdata[3];
+  bit_t bdata[4];
+  bit_t ldata[4];
+  quad_t qdata[4];
+  wide_t wdata[4];
 
   initial begin
     str0 = "sm";
     str1 = "medium";
     str2 = "veryverylongwilltruncate";
+    str3 = "";
     bdata[0] = bit_t'(str0);
     bdata[1] = bit_t'(str1);
     bdata[2] = bit_t'(str2);
+    bdata[3] = bit_t'(str3);
     `checks(bdata[0], "sm");
     `checks(bdata[1], "dium");
     `checks(bdata[2], "cate");
+    `checks(bdata[3], "");
     if (bdata[0] != 32'h0000736d) $stop;
     if (bdata[1] != 32'h6469756d) $stop;
     ldata[0] = logic_t'(str0);
     ldata[1] = logic_t'(str1);
     ldata[2] = logic_t'(str2);
+    ldata[3] = logic_t'(str3);
     `checks(ldata[0], "sm");
     `checks(ldata[1], "dium");
     `checks(ldata[2], "cate");
+    `checks(ldata[3], "");
     qdata[0] = quad_t'(str0);
     qdata[1] = quad_t'(str1);
     qdata[2] = quad_t'(str2);
+    qdata[3] = quad_t'(str3);
     `checks(qdata[0], "sm");
     `checks(qdata[1], "medium");
     `checks(qdata[2], "runcate");
+    `checks(qdata[3], "");
     wdata[0] = wide_t'(str0);
     wdata[1] = wide_t'(str1);
     wdata[2] = wide_t'(str2);
+    wdata[3] = wide_t'(str3);
     `checks(wdata[0], "sm");
     `checks(wdata[1], "medium");
     `checks(wdata[2], "illtruncate");
+    `checks(wdata[3], "");
   end
 
   // Test loop
@@ -68,34 +78,43 @@ module t (
       str0 = "z";
       str1 = "zmedi";
       str2 = "ziggylonglonglongtruncate";
+      str3 = "";
     end
     else if (cyc == 2) begin
       bdata[0] = bit_t'(str0);
       bdata[1] = bit_t'(str1);
       bdata[2] = bit_t'(str2);
+      bdata[3] = bit_t'(str3);
       ldata[0] = logic_t'(str0);
       ldata[1] = logic_t'(str1);
       ldata[2] = logic_t'(str2);
+      ldata[3] = logic_t'(str3);
       qdata[0] = quad_t'(str0);
       qdata[1] = quad_t'(str1);
       qdata[2] = quad_t'(str2);
+      qdata[3] = quad_t'(str3);
       wdata[0] = wide_t'(str0);
       wdata[1] = wide_t'(str1);
       wdata[2] = wide_t'(str2);
+      wdata[3] = wide_t'(str3);
     end
     else if (cyc == 3) begin
       `checks(bdata[0], "z");
       `checks(bdata[1], "medi");
       `checks(bdata[2], "cate");
+      `checks(bdata[3], "");
       `checks(ldata[0], "z");
       `checks(ldata[1], "medi");
       `checks(ldata[2], "cate");
+      `checks(ldata[3], "");
       `checks(qdata[0], "z");
       `checks(qdata[1], "zmedi");
       `checks(qdata[2], "runcate");
+      `checks(qdata[3], "");
       `checks(wdata[0], "z");
       `checks(wdata[1], "zmedi");
       `checks(wdata[2], "ongtruncate");
+      `checks(wdata[3], "");
     end
     //
     else if (cyc == 99) begin