From 7a0181160d36a43634b9c8a0cf22ec4bcd45f7f3 Mon Sep 17 00:00:00 2001
From: dpcarry <pd2170@nyu.edu>
Date: Wed, 21 Feb 2024 03:33:19 -0500
Subject: [PATCH] feat: incomplete testbench

---
 dv/ahb/SimpleDecoder/SimpleDecoder_tb.cpp | 34 ++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/dv/ahb/SimpleDecoder/SimpleDecoder_tb.cpp b/dv/ahb/SimpleDecoder/SimpleDecoder_tb.cpp
index 0eb2265..3b6990b 100644
--- a/dv/ahb/SimpleDecoder/SimpleDecoder_tb.cpp
+++ b/dv/ahb/SimpleDecoder/SimpleDecoder_tb.cpp
@@ -1,4 +1,36 @@
 #include <catch2/catch_test_macros.hpp>
 #include <VSimpleDecoder_tl.h>
 
-TEST_CASE("SimpleDecoder, Dummy Test") {}
+
+TEST_CASE("SimpleDecoder, Basic Functionality") {
+    VSimpleDecoder_tl* decoder = new VSimpleDecoder_tl;
+    Verilated::traceEverOn(true);
+    decoder->clk = 0;
+    decoder->nReset = 1;
+    decoder->eval();
+    decoder->clk = 1;
+    decoder->eval();
+    decoder->clk = 0;
+    decoder->eval();
+    decoder->nReset = 0;
+    decoder->eval();
+    decoder->clk = 1;
+    decoder->eval();
+
+    //test for addresses 1 to 20
+    for (int address = 1; address <= 3; ++address) {
+        int expected_sel = 1 << (address - 1);
+
+        decoder->addr = address;
+        decoder->eval();
+        decoder->clk = 0; //falling edge
+        decoder->eval();
+        decoder->clk = 1; //rising edge
+        decoder->eval();
+
+        CAPTURE(address, expected_sel); //capture the values
+        REQUIRE(decoder->sel == expected_sel);
+    }
+    decoder->final();
+    delete decoder;
+}