Testing file for MOS6502/cpu

test/unit.src.chip.MOS6502.cpu.spec.js

+const expect = require('chai').expect;
+const CPU = require('../src/chip/MOS6502/cpu.js');
+const Bank = require('../src/common/bank.js');
+
+
+describe("Testing MOS6502 CPU...", function(){
+  var cpu = new CPU();
+  var tick = cpu.clk();
+  cpu.memory = new Bank(65536);
+  cpu.memory.load(0xFFFC, [0x00, 0x00]);
+ 
+  it("Resetting (IRQ Disabled flag must be on", function(){
+    cpu.reset();
+    expect(cpu.I).to.equal(1);
+    expect(cpu.PC).to.equal(0); // Test program counter set to the vector stored at 0xFFFC - 0xFFFD
+  });
+
+  describe("Testing flag set/clear calls...", function(){
+    it("CLC / SEC", function(){
+      cpu.memory.clearPage(0);
+      cpu.memory.load(0, [0x18, 0x38]);
+      cpu.reset();
+      tick(); tick(); // Two ticks to process opcode.
+      expect(cpu.C).to.equal(0);
+      tick(); tick();
+      expect(cpu.C).to.equal(1);
+    });
+
+    it("CLI / SEI", function(){
+      cpu.memory.clearPage(0);
+      cpu.memory.load(0, [0x58, 0x78]);
+      cpu.reset();
+      tick(); tick();
+      expect(cpu.I).to.equal(0);
+      tick(); tick();
+      expect(cpu.I).to.equal(1);
+    });
+
+    it("CLD / SED", function(){
+      cpu.memory.clearPage(0);
+      cpu.memory.load(0, [0xD8, 0xF8]);
+      cpu.reset();
+      tick(); tick();
+      expect(cpu.D).to.equal(0);
+      tick(); tick();
+      expect(cpu.D).to.equal(1);
+    });
+
+    it("CLV", function(){
+      cpu.memory.clearPage(0);
+      cpu.memory.load(0, [0xB8]);
+      cpu.reset();
+      tick(); tick();
+      expect(cpu.V).to.equal(0);
+    });
+  });
+
+  describe("Testing ADC...", function(){
+    it("ADC Immediate", function(){
+      cpu.memory.clearPage(0);
+      // CLC
+      // CLV
+      // CLD
+      // CLI
+      // ADC $01
+      // ADC $01
+      cpu.memory.load(0, [0x18, 0xB8, 0xD8, 0x58, 0x69, 0x01, 0x69, 0x01]);
+      cpu.reset();
+      // Getting through the 4 clear flag calls. Each should take 2 ticks.
+      tick(); tick(); tick(); tick(); tick(); tick(); tick(); tick();
+      // Now processing the adds.
+      expect(cpu.A).to.equal(0);
+      tick();
+      expect(cpu.A).to.equal(0);
+      tick();
+      expect(cpu.A).to.equal(1);
+      tick();
+      expect(cpu.A).to.equal(1);
+      tick();
+      expect(cpu.A).to.equal(2);
+    });
+
+    it("ADC Zero Page");
+    it("ADC Zero Page, X");
+    it("ADC Absolute");
+    it("ADC Absolute, X");
+    it("ADC Absolute, Y");
+    it("ADC Indirect, X");
+    it("ADC Indirect, Y");
+
+    it ("ADC Test Zero flag", /*function(){
+      cpu.memory.clearPage(0);
+      cpu.memory.load(0, [0x18, 0xB8, 0xD8, 0x58, 0x69, 0xFF, 0x69, 0x01]);
+      // Getting through the 4 clear flag calls. Each should take 2 ticks.
+      tick(); tick(); tick(); tick(); tick(); tick(); tick(); tick();
+      // Now processing the adds.
+      expect(cpu.A).to.equal(0);
+      tick();
+      expect(cpu.A).to.equal(0);
+      tick();
+      expect(cpu.A).to.equal(1);
+      tick();
+      expect(cpu.A).to.equal(1);
+      tick();
+      expect(cpu.A).to.equal(2);
+    }*/);
+  });
+});
+
+
+
+
+