fix core boundary wrapping

1 files changed, 45 insertions, 1 deletions

diff --git a/src/vm/instruction.test.js b/src/vm/instruction.test.js
index a93a3b0..8efa47f 100644
--- a/src/vm/instruction.test.js
+++ b/src/vm/instruction.test.js
@@ -1,7 +1,11 @@
 'use strict';
 
 const { Core } = require('./core.js');
-const { DAT, MOV, ADD, SUB, CMP, SLT } = require('./instruction.js');
+const { 
+	DAT, 
+	MOV, ADD, SUB, CMP, SLT,
+	JMP,
+} = require('./instruction.js');
 
 
 const CORESIZE = 8000;
@@ -109,6 +113,33 @@ test('MOV correctly handles predecrement indirection', () => {
 });
 
 
+test('MOV correctly handles core boundaries', () => {
+	const core = new Core(CORESIZE);
+	const pc = CORESIZE-1;
+	core.data[pc] = {
+		opcode: 'MOV',
+		a: { mode: 'immediate', value: 100 },
+		b: { mode: 'predecrement', value: 2 },
+	};
+	const ins = core.data[pc];
+	expect(core.data[0].opcode).toBe('DAT');
+	expect(MOV(core, pc, ins)).toEqual([0]);
+	expect(core.data[1]).toEqual({	
+		opcode: 'DAT',
+		a: { mode: 'immediate', value: 0 },
+		b: { mode: 'immediate', value: -1 },
+	});
+
+	expect(core.data[0]).toEqual({	
+		opcode: 'DAT',
+		a: { mode: 'immediate', value: 0 },
+		b: { mode: 'immediate', value: 100 },
+	});
+
+});
+
+
+
 test('ADD correctly adds two full instructions', () => {
 	const core = new Core(CORESIZE);
 	const pc = 20;
@@ -347,3 +378,16 @@ test('SLT properly compares B-fields', () => {
 	expect(SLT(core, pc, ins)).toEqual([pc+2]);
 });
 
+
+test('JMP correctly jumps', () => {
+	const core = new Core(CORESIZE);
+	const pc = 2;
+	core.data[pc] = {
+		opcode: 'JMP',
+		a: { mode: 'direct', value: -3 },
+		b: { mode: 'direct', value: 0 },
+	};
+	const ins = core.data[pc];
+
+	expect(JMP(core, pc, ins)).toEqual([CORESIZE-1]);
+});