130 lines
3.4 KiB
Java
130 lines
3.4 KiB
Java
package android.emu6502;
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import android.emu6502.instructions.Symbols;
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import com.google.common.collect.ImmutableList;
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import org.junit.Before;
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import org.junit.Test;
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import java.util.List;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.junit.Assert.assertThat;
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public class CPUTest {
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private CPU cpu;
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private Assembler assembler;
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@Before public void setUp() {
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Memory memory = new Memory(new Display());
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assembler = new Assembler(memory, new Symbols());
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cpu = new CPU(memory);
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}
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@Test public void testSimple() {
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List<String> lines = ImmutableList.of(
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"LDA #$01",
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"STA $0200",
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"LDA #$05",
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"STA $0201",
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"LDA #$08",
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"STA $0202");
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assembler.assembleCode(lines);
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cpu.execute();
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assertThat(cpu.getA(), equalTo(0x08));
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assertThat(cpu.getX(), equalTo(0x00));
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assertThat(cpu.getY(), equalTo(0x00));
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assertThat(cpu.getSP(), equalTo(0xFF));
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assertThat(cpu.getPC(), equalTo(0x0610));
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assertThat(cpu.flags(), equalTo("00110000"));
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}
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@Test public void testWithComments() {
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List<String> lines = ImmutableList.of(
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"LDA #$c0 ;Load the hex value $c0 into the A register",
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"TAX ;Transfer the value in the A register to X",
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"INX ;Increment the value in the X register",
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"ADC #$c4 ;Add the hex value $c4 to the A register",
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"BRK ;Break - we're done");
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assembler.assembleCode(lines);
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cpu.execute();
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assertThat(cpu.getA(), equalTo(0x84));
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assertThat(cpu.getX(), equalTo(0xC1));
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assertThat(cpu.getY(), equalTo(0x00));
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assertThat(cpu.getSP(), equalTo(0xFF));
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assertThat(cpu.getPC(), equalTo(0x0607));
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assertThat(cpu.flags(), equalTo("10110001"));
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}
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@Test public void testBranchAndLabel() {
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List<String> lines = ImmutableList.of(
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"LDX #$08",
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"decrement:",
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"DEX",
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"STX $0200",
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"CPX #$03",
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"BNE decrement",
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"STX $0201",
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"BRK");
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assembler.assembleCode(lines);
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cpu.execute();
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assertThat(cpu.getA(), equalTo(0x00));
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assertThat(cpu.getX(), equalTo(0x03));
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assertThat(cpu.getY(), equalTo(0x00));
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assertThat(cpu.getSP(), equalTo(0xFF));
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assertThat(cpu.getPC(), equalTo(0x060e));
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assertThat(cpu.flags(), equalTo("00110011"));
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}
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@Test public void testJump() {
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List<String> lines = ImmutableList.of(
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"LDA #$03",
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"JMP there",
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"BRK",
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"BRK",
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"BRK",
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"there:",
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"STA $0200");
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assembler.assembleCode(lines);
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cpu.execute();
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assertThat(cpu.getA(), equalTo(0x03));
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assertThat(cpu.getX(), equalTo(0x00));
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assertThat(cpu.getY(), equalTo(0x00));
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assertThat(cpu.getSP(), equalTo(0xFF));
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assertThat(cpu.getPC(), equalTo(0x060c));
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assertThat(cpu.flags(), equalTo("00110000"));
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}
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@Test public void testJumpToSubroutines() {
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List<String> lines = ImmutableList.of(
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"JSR init",
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"JSR loop",
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"JSR end",
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"init:",
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"LDX #$00",
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"RTS",
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"loop:",
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"INX",
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"CPX #$05",
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"BNE loop",
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"RTS",
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"end:",
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"BRK");
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assembler.assembleCode(lines);
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cpu.execute();
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assertThat(cpu.getA(), equalTo(0x00));
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assertThat(cpu.getX(), equalTo(0x05));
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assertThat(cpu.getY(), equalTo(0x00));
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assertThat(cpu.getSP(), equalTo(0xFD));
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assertThat(cpu.getPC(), equalTo(0x0613));
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assertThat(cpu.flags(), equalTo("00110011"));
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}
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}
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