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Do a better job testing overflow

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This commit is contained in:
Peter Evans 2018-03-01 17:24:51 -06:00
parent f8bda4ebd3
commit 0949661b18
1 changed files with 31 additions and 0 deletions
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31
tests/mos6502.arith.c
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@ -12,7 +12,12 @@ Test(mos6502_arith, adc)
mos6502_handle_adc(cpu, 3);
cr_assert_eq(cpu->A, 9);
cpu->A = 0xfe;
mos6502_handle_adc(cpu, 0x5);
cr_assert_eq(cpu->A, (vm_8bit)(0xfe + 0x5));
cpu->P &= ~MOS_CARRY;
cpu->A = 9;
mos6502_handle_adc(cpu, 64);
cr_assert_eq(cpu->A, 73);
@ -30,8 +35,13 @@ Test(mos6502_arith, adc_dec)
mos6502_handle_adc_dec(cpu, 0x10);
cr_assert_eq(cpu->A, 0x15);
cpu->A = 0x98;
mos6502_handle_adc_dec(cpu, 0x3);
cr_assert_eq(cpu->A, 0x1);
// Test that A + M + 1 works for carry
cpu->P |= MOS_CARRY;
cpu->A = 0x15;
mos6502_handle_adc_dec(cpu, 0x13);
cr_assert_eq(cpu->A, 0x29);
}
@ -55,6 +65,10 @@ Test(mos6502_arith, cmp)
cr_assert_eq(cpu->P & MOS_CARRY, MOS_CARRY);
cr_assert_eq(cpu->P & MOS_NEGATIVE, MOS_NEGATIVE);
cr_assert_eq(cpu->P & MOS_ZERO, 0);
cpu->A = 111;
mos6502_handle_cmp(cpu, 111);
cr_assert_eq(cpu->P & MOS_ZERO, MOS_ZERO);
}
Test(mos6502_arith, cpx)
@ -89,6 +103,11 @@ Test(mos6502_arith, dec)
// necessarily need for that to be so.
mos6502_handle_dec(cpu, 44);
cr_assert_eq(mos6502_get(cpu, 123), 43);
cpu->eff_addr = 0;
cpu->A = 0;
mos6502_handle_dec(cpu, 0);
cr_assert_eq(cpu->A, 0xff);
}
Test(mos6502_arith, dex)
@ -115,6 +134,10 @@ Test(mos6502_arith, inc)
cpu->eff_addr = 0;
mos6502_handle_inc(cpu, 0);
cr_assert_eq(cpu->A, 9);
cpu->A = 0xff;
mos6502_handle_inc(cpu, 0);
cr_assert_eq(cpu->A, 0);
}
Test(mos6502_arith, inx)
@ -137,6 +160,10 @@ Test(mos6502_arith, sbc)
mos6502_handle_sbc(cpu, 3);
cr_assert_eq(cpu->A, 2);
cpu->A = 0x3;
mos6502_handle_sbc(cpu, 5);
cr_assert_eq(cpu->A, (vm_8bit)(0x3 - 0x5));
cpu->P &= ~MOS_CARRY;
cpu->A = 16;
mos6502_handle_sbc(cpu, 8);
@ -159,4 +186,8 @@ Test(mos6502_arith, sbc_dec)
cpu->A = 0x12;
mos6502_handle_sbc_dec(cpu, 0x2);
cr_assert_eq(cpu->A, 0x10);
cpu->A = 0x2;
mos6502_handle_sbc_dec(cpu, 0x3);
cr_assert_eq(cpu->A, 0x99);
}