diff --git a/tests/adding/adding.v b/tests/adding/adding.v
index a64f106..9f7d82d 100644
--- a/tests/adding/adding.v
+++ b/tests/adding/adding.v
@@ -7,19 +7,16 @@
         $finish; \
     end
 
-module tb_adding(
-    output o_uart_tx
-);
+module tb_adding();
+    reg clk = 0;
 
-reg clk = 0;
+    Beepo #(
+        .FREQ(1),
+        .UART_BAUD(1_000_000)
+    ) bep (
+        .i_clk(clk)
+    );
 
-Beepo #(
-    .FREQ(1),
-    .UART_BAUD(1_000_000)
-) bep (
-    .i_clk(clk),
-    .o_uart_tx(o_uart_tx)
-);
     localparam CLK_PERIOD = 1.0;
     always #(CLK_PERIOD/2) clk=~clk;
 
@@ -34,7 +31,7 @@ Beepo #(
         );
     end
 
-    // should probably do more tests than just the end
+    // should probably do more granular tests
     initial #10000 begin
         `assert(bep.r_registers[1], 64'h2020202040406090);
         $finish;