From 560bd5bfa1db7f8ad2566fd31aaad2f9938ac43c Mon Sep 17 00:00:00 2001
From: Amneesh Singh <natto@weirdnatto.in>
Date: Sat, 23 Sep 2023 23:20:05 +0530
Subject: [PATCH] tests: add tests for bus

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
---
 tests/bus.cc      | 45 +++++++++++++++++++++++++++++++++++++++++++++
 tests/meson.build |  3 ++-
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 tests/bus.cc

diff --git a/tests/bus.cc b/tests/bus.cc
new file mode 100644
index 0000000..b288103
--- /dev/null
+++ b/tests/bus.cc
@@ -0,0 +1,45 @@
+#include "bus.hh"
+#include <catch2/catch_test_macros.hpp>
+
+#define TAG "bus"
+
+using namespace matar;
+
+class BusFixture {
+  public:
+    BusFixture()
+      : bus(Memory(std::array<uint8_t, Memory::BIOS_SIZE>(),
+                   std::vector<uint8_t>(Header::HEADER_SIZE))) {}
+
+  protected:
+    Bus bus;
+};
+
+TEST_CASE_METHOD(BusFixture, "Byte", TAG) {
+    CHECK(bus.read_byte(3349) == 0);
+
+    bus.write_byte(3349, 0xEC);
+    CHECK(bus.read_byte(3349) == 0xEC);
+    CHECK(bus.read_word(3349) == 0xEC);
+    CHECK(bus.read_halfword(3349) == 0xEC);
+}
+
+TEST_CASE_METHOD(BusFixture, "Halfword", TAG) {
+    CHECK(bus.read_halfword(33750745) == 0);
+
+    bus.write_halfword(33750745, 0x1A4A);
+    CHECK(bus.read_halfword(33750745) == 0x1A4A);
+    CHECK(bus.read_word(33750745) == 0x1A4A);
+    CHECK(bus.read_byte(33750745) == 0x4A);
+}
+
+TEST_CASE_METHOD(BusFixture, "Word", TAG) {
+    CHECK(bus.read_word(100724276) == 0);
+
+    bus.write_word(100724276, 0x3ACC491D);
+    CHECK(bus.read_word(100724276) == 0x3ACC491D);
+    CHECK(bus.read_halfword(100724276) == 0x491D);
+    CHECK(bus.read_byte(100724276) == 0x1D);
+}
+
+#undef TAG
diff --git a/tests/meson.build b/tests/meson.build
index d06ab7c..81007e9 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -5,7 +5,8 @@ tests_deps = [
 src = include_directories('../src')
 
 tests_sources = files(
-  'main.cc'
+  'main.cc',
+  'bus.cc'
 )
 
 subdir('cpu')