vt1200/harness/mame/test_vt1200_board.cpp

// Standalone unit tests for the VT1200 board register model.
//   g++ -std=c++17 -o /tmp/t vt1200_board.cpp test_vt1200_board.cpp && /tmp/t
#include "vt1200_board.h"
#include <cassert>
#include <cstdio>

static int failures = 0;
#define CHECK(cond) do { if (!(cond)) { \
    std::printf("FAIL %s:%d  %s\n", __FILE__, __LINE__, #cond); failures++; } } while (0)

static void test_default_read(void)
{
    vt1200_board b;
    b.set_default(0x0000);
    CHECK(b.read(VT1200_WIN2 + VT1200_OFF_STATUS) == 0x0000);
}

static void test_override_read(void)
{
    vt1200_board b;
    b.set_override(VT1200_WIN2 + VT1200_OFF_STATUS, 0x00b7);
    CHECK(b.read(VT1200_WIN2 + VT1200_OFF_STATUS) == 0x00b7);
}

static void test_monitor_switch_is_mixed_with_latches(void)
{
    vt1200_board b;
    b.set_monitor_switch(7);                              // position 7 -> bits 4-6 = 0x70
    b.write(VT1200_WIN3 + VT1200_OFF_SWITCH, 0x0001);     // output latch writes bit 0
    const uint16_t v = b.read(VT1200_WIN3 + VT1200_OFF_SWITCH);
    CHECK((v & 0x0070) == 0x0070);           // switch bits read back as input
    CHECK((v & 0x0001) == 0x0001);           // output bits read back as latched
}

static void test_busy_bit_arms_on_write_and_clears(void)
{
    vt1200_board b;
    b.set_model_handshake(true);
    b.set_busy_ticks(2);
    const uint32_t status = VT1200_WIN2 + VT1200_OFF_STATUS;
    const uint32_t cmd    = VT1200_WIN2 + VT1200_OFF_CMD;

    CHECK((b.read(status) & 0x0001) == 0x0000);   // idle
    b.write(cmd, 0x00ca);                          // command arms it
    CHECK((b.read(status) & 0x0001) == 0x0001);   // busy
    b.tick();
    CHECK((b.read(status) & 0x0001) == 0x0001);   // still busy
    b.tick();
    CHECK((b.read(status) & 0x0001) == 0x0000);   // done
}

int main(void)
{
    test_default_read();
    test_override_read();
    test_monitor_switch_is_mixed_with_latches();
    test_busy_bit_arms_on_write_and_clears();
    std::printf(failures ? "%d FAILURE(S)\n" : "all board tests passed\n", failures);
    return failures ? 1 : 0;
}