diff --git a/simulation/test_alu.cpp b/simulation/test_alu.cpp
index c068d07..1396ac8 100644
--- a/simulation/test_alu.cpp
+++ b/simulation/test_alu.cpp
@@ -281,6 +281,50 @@ int main(int argc, char **argv) {
         });
     }
 
+    {
+        Tester mul_t(&alu_t, "mul", true);
+
+        test_op(&mul_t, {
+            .state = &state,
+            .name = "0x55*0x1",
+            .A = 0x55, .B = 0x1, .op = 0b010,
+            .O = 0x55,
+            .max_cycles = 33,
+        });
+
+        test_op(&mul_t, {
+            .state = &state,
+            .name = "0x1*0x55",
+            .A = 0x1, .B = 0x55, .op = 0b010,
+            .O = 0x55,
+            .max_cycles = 33,
+        });
+
+        test_op(&mul_t, {
+            .state = &state,
+            .name = "0x5*0x5",
+            .A = 0x5, .B = 0x5, .op = 0b010,
+            .O = 0x19,
+            .max_cycles = 33,
+        });
+
+        test_op(&mul_t, {
+            .state = &state,
+            .name = "0x21*0x37",
+            .A = 0x21, .B = 0x37, .op = 0b010,
+            .O = 0x717,
+            .max_cycles = 33,
+        });
+
+        test_op(&mul_t, {
+            .state = &state,
+            .name = "0x12345678*0x87654321",
+            .A = 0x12345678, .B = 0x87654321, .op = 0b010,
+            .O = 0x9a0cd0570b88d78,
+            .max_cycles = 33,
+        });
+    }
+
     if (DO_AUTO) {
         Tester auto_t(&alu_t, "auto", true);
 
@@ -374,6 +418,8 @@ int main(int argc, char **argv) {
             }
         }
     }
+
+
     #ifdef TRACE
     state.trace->close();
     #endif