Added and passed jump instruction test

creature_test.go

@@ -199,3 +199,31 @@ func TestHalt(test *testing.T) {
 		test.Fail()
 	}
 }
+
+func TestJump(test *testing.T) {
+	machine := runMachineTest ([]int {
+		PUSH, 1,
+		PUSH, 8,
+		JMP,
+		
+		PUSH, 3,
+		HALT,
+
+		PUSH, 0,
+		PUSH, 16,
+		JMP,
+
+		PUSH, 4,
+		HALT,
+
+		PUSH, 5,
+	}, nil, test)
+	
+	result := machine.Pop()
+	test.Log("popped:", result)
+
+	if result != 4 {
+		test.Log("result should be", 4)
+		test.Fail()
+	}
+}