diff --git a/Other/Lossless_Scaling_Manager.ahk b/Other/Lossless_Scaling_Manager.ahk
index b82e254..4ed51be 100644
--- a/Other/Lossless_Scaling_Manager.ahk
+++ b/Other/Lossless_Scaling_Manager.ahk
@@ -13,7 +13,9 @@ EnsureAdmin() {
   try Run('*RunAs "' A_AhkPath '" "' A_ScriptFullPath '" ' A_Args.Join(" "))
   ExitApp
 }
-EnsureAdmin()
+if (A_LineFile == A_ScriptFullPath) {
+  EnsureAdmin()
+}
 
 MinimizeLS() {
   try {
@@ -35,23 +37,29 @@ StopLS() {
   try ProcessClose("LosslessScaling.exe")
 }
 
-ToggleLS() {
-  if ProcessExist("LosslessScaling.exe")
-    StopLS()
+ToggleLS(mockProcessExist := "", mockStopLS := "", mockStartLS := "") {
+  fnProcessExist := (mockProcessExist != "") ? mockProcessExist : ProcessExist
+  fnStopLS := (mockStopLS != "") ? mockStopLS : StopLS
+  fnStartLS := (mockStartLS != "") ? mockStartLS : StartLS
+
+  if fnProcessExist("LosslessScaling.exe")
+    fnStopLS()
   else
-    StartLS()
+    fnStartLS()
 }
 
 ; ---------- Dispatch ----------
-cmd := (A_Args.Length ? StrLower(A_Args[1]) : "toggle")
-try {
-  switch cmd {
-    case "start":  StartLS()
-    case "stop", "close": StopLS()
-    case "toggle": ToggleLS()
-    default:
-      MsgBox("Usage: " A_ScriptName " [start|stop|toggle]")
+if (A_LineFile == A_ScriptFullPath) {
+  cmd := (A_Args.Length ? StrLower(A_Args[1]) : "toggle")
+  try {
+    switch cmd {
+      case "start":  StartLS()
+      case "stop", "close": StopLS()
+      case "toggle": ToggleLS()
+      default:
+        MsgBox("Usage: " A_ScriptName " [start|stop|toggle]")
+    }
+  } catch Error as err {
+    MsgBox("Error: " err.Message)
   }
-} catch Error as err {
-  MsgBox("Error: " err.Message)
 }
diff --git a/tests/Other/Lossless_Scaling_Manager_Test.ahk b/tests/Other/Lossless_Scaling_Manager_Test.ahk
new file mode 100644
index 0000000..c7b3581
--- /dev/null
+++ b/tests/Other/Lossless_Scaling_Manager_Test.ahk
@@ -0,0 +1,88 @@
+#Requires AutoHotkey v2.0
+#SingleInstance Force
+
+; Setup testing output
+stdout := FileOpen("*", "w `n")
+testsPassed := 0
+testsFailed := 0
+
+AssertEqual(expected, actual, context) {
+    global testsPassed, testsFailed, stdout
+    if (expected == actual) {
+        testsPassed++
+        stdout.WriteLine("PASS: " . context)
+    } else {
+        testsFailed++
+        stdout.WriteLine("FAIL: " . context . " - Expected '" . expected . "', but got '" . actual . "'")
+    }
+}
+
+#Include %A_ScriptDir%\..\..\Other\Lossless_Scaling_Manager.ahk
+
+global mockProcessExistCalled := 0
+global mockProcessExistArg := ""
+global mockProcessExistResult := 0
+
+global mockStartLSCalled := 0
+global mockStopLSCalled := 0
+
+MockProcessExist(exeName) {
+    global mockProcessExistCalled, mockProcessExistArg, mockProcessExistResult
+    mockProcessExistCalled++
+    mockProcessExistArg := exeName
+    return mockProcessExistResult
+}
+
+MockStartLS() {
+    global mockStartLSCalled
+    mockStartLSCalled++
+}
+
+MockStopLS() {
+    global mockStopLSCalled
+    mockStopLSCalled++
+}
+
+ResetMocks() {
+    global mockProcessExistCalled := 0
+    global mockProcessExistArg := ""
+    global mockProcessExistResult := 0
+    global mockStartLSCalled := 0
+    global mockStopLSCalled := 0
+}
+
+try {
+    stdout.WriteLine("Starting ToggleLS tests...")
+
+    ; Test 1: Process exists, should call StopLS
+    ResetMocks()
+    mockProcessExistResult := 1234 ; some PID
+    ToggleLS(MockProcessExist, MockStopLS, MockStartLS)
+    AssertEqual(1, mockProcessExistCalled, "ToggleLS checks if process exists")
+    AssertEqual("LosslessScaling.exe", mockProcessExistArg, "ToggleLS checks for LosslessScaling.exe")
+    AssertEqual(1, mockStopLSCalled, "StopLS called when process exists")
+    AssertEqual(0, mockStartLSCalled, "StartLS NOT called when process exists")
+
+    ; Test 2: Process does NOT exist, should call StartLS
+    ResetMocks()
+    mockProcessExistResult := 0 ; 0 means process not found
+    ToggleLS(MockProcessExist, MockStopLS, MockStartLS)
+    AssertEqual(1, mockProcessExistCalled, "ToggleLS checks if process exists")
+    AssertEqual("LosslessScaling.exe", mockProcessExistArg, "ToggleLS checks for LosslessScaling.exe")
+    AssertEqual(0, mockStopLSCalled, "StopLS NOT called when process does not exist")
+    AssertEqual(1, mockStartLSCalled, "StartLS called when process does not exist")
+
+    ; Final Results
+    stdout.WriteLine("---")
+    stdout.WriteLine("Tests Passed: " . testsPassed)
+    stdout.WriteLine("Tests Failed: " . testsFailed)
+} catch Error as err {
+    stdout.WriteLine("Test script threw an error: " . err.Message)
+    testsFailed++
+}
+
+if (testsFailed > 0) {
+    ExitApp(1)
+}
+
+ExitApp(0)