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import { CPU } from './cpu';
type ITestEvent = [number, number]; // Expected cycles, actual cycles
describe('cpu', () => {
it('should set initial value of SP to the last byte of internal SRAM', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
expect(cpu.SP).toEqual(0x10ff);
});
describe('events', () => {
it('should execute queued events after the given number of cycles has passed', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
const events: ITestEvent[] = [];
for (const i of [1, 4, 10]) {
cpu.addClockEvent(() => events.push([i, cpu.cycles]), i);
}
for (let i = 0; i < 10; i++) {
cpu.cycles++;
cpu.tick();
}
expect(events).toEqual([
[1, 1],
[4, 4],
[10, 10],
]);
});
it('should correctly sort the events when added in reverse order', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
const events: ITestEvent[] = [];
for (const i of [10, 4, 1]) {
cpu.addClockEvent(() => events.push([i, cpu.cycles]), i);
}
for (let i = 0; i < 10; i++) {
cpu.cycles++;
cpu.tick();
}
expect(events).toEqual([
[1, 1],
[4, 4],
[10, 10],
]);
});
describe('updateClockEvent', () => {
it('should update the number of cycles for the given clock event', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
const events: ITestEvent[] = [];
const callbacks = [];
for (const i of [1, 4, 10]) {
callbacks[i] = cpu.addClockEvent(() => events.push([i, cpu.cycles]), i);
}
cpu.updateClockEvent(callbacks[4], 2);
cpu.updateClockEvent(callbacks[1], 12);
for (let i = 0; i < 14; i++) {
cpu.cycles++;
cpu.tick();
}
expect(events).toEqual([
[4, 2],
[10, 10],
[1, 12],
]);
});
describe('clearClockEvent', () => {
it('should remove the given clock event', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
const events: ITestEvent[] = [];
const callbacks = [];
for (const i of [1, 4, 10]) {
callbacks[i] = cpu.addClockEvent(() => events.push([i, cpu.cycles]), i);
}
cpu.clearClockEvent(callbacks[4]);
for (let i = 0; i < 10; i++) {
cpu.cycles++;
cpu.tick();
}
expect(events).toEqual([
[1, 1],
[10, 10],
]);
});
it('should return false if the provided clock event is not scheduled', () => {
const cpu = new CPU(new Uint16Array(1024), 0x1000);
const event4 = cpu.addClockEvent(() => 0, 4);
const event10 = cpu.addClockEvent(() => 0, 10);
cpu.addClockEvent(() => 0, 1);
// Both event should be successfully removed
expect(cpu.clearClockEvent(event4)).toBe(true);
expect(cpu.clearClockEvent(event10)).toBe(true);
// And now we should get false, as these events have already been removed
expect(cpu.clearClockEvent(event4)).toBe(false);
expect(cpu.clearClockEvent(event10)).toBe(false);
});
});
});
});
});
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