Extracted basic funcionality and added tests

Author: Guilherme Ferreira

.gitignore

@@ -0,0 +1 @@
+sloop

main.go

@@ -6,20 +6,39 @@ import (
 	"github.com/go-vgo/robotgo"
 )
 
+func checkLoop(screenWidth, mouseX, activationMargin int) string {
+
+	if mouseX+activationMargin > screenWidth {
+		return "left"
+	} else if mouseX-activationMargin < 0 {
+		return "right"
+	}
+
+	return ""
+}
+
 func main() {
 
+	var (
+		activationMargin = 10
+		jumpDelta        = 1
+		checkFrequency   = 50
+	)
+
 	for {
 		screenWidth, _ := robotgo.GetScreenSize()
-
 		mouseX, mouseY := robotgo.GetMousePos()
 
-		if mouseX+10 > screenWidth {
-			robotgo.MoveMouse(11, mouseY)
-		} else if mouseX-10 < 0 {
-			robotgo.MoveMouse(screenWidth-11, mouseY)
+		loop := checkLoop(screenWidth, mouseX, activationMargin)
+
+		switch loop {
+		case "left":
+			robotgo.MoveMouse(activationMargin+jumpDelta, mouseY)
+		case "right":
+			robotgo.MoveMouse(screenWidth-(activationMargin+jumpDelta), mouseY)
 		}
 
-		time.Sleep(50 * time.Millisecond)
+		time.Sleep(time.Duration(checkFrequency) * time.Millisecond)
 	}
 
 }

main_test.go

@@ -0,0 +1,27 @@
+package main
+
+import "testing"
+
+func Test_checkLoop(t *testing.T) {
+	type args struct {
+		screenWidth      int
+		mouseX           int
+		activationMargin int
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{"Test Left Jump", args{100, 91, 10}, "left"},
+		{"Test Right Jump", args{100, 1, 10}, "right"},
+		{"Test No Jump", args{100, 50, 10}, ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := checkLoop(tt.args.screenWidth, tt.args.mouseX, tt.args.activationMargin); got != tt.want {
+				t.Errorf("checkLoop() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}