From 72d2c5d97c8a74bf9d6279f7942e712e02fbfa33 Mon Sep 17 00:00:00 2001
From: radumacocian <rmacocian@yahoo.com>
Date: Tue, 29 Apr 2025 19:26:31 +0200
Subject: [PATCH] added shift function and tests

---
 cpu/operations/shift.go      |  5 +++++
 cpu/operations/shift_test.go | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 cpu/operations/shift.go
 create mode 100644 cpu/operations/shift_test.go

diff --git a/cpu/operations/shift.go b/cpu/operations/shift.go
new file mode 100644
index 0000000..c68259a
--- /dev/null
+++ b/cpu/operations/shift.go
@@ -0,0 +1,5 @@
+package operations
+
+func Shift(r1 *byte) {
+	*r1 = *r1 << 1
+}
diff --git a/cpu/operations/shift_test.go b/cpu/operations/shift_test.go
new file mode 100644
index 0000000..5073b69
--- /dev/null
+++ b/cpu/operations/shift_test.go
@@ -0,0 +1,17 @@
+package operations
+
+import (
+	"testing"
+)
+
+func TestShift(t *testing.T) {
+	r1 := byte(0b01010101)
+	Shift(&r1)
+
+	expected := byte(0b10101010)
+	actual := r1
+
+	if actual != expected {
+		t.Errorf("actual %x != expected %x", actual, expected)
+	}
+}