diff --git a/hook_test.go b/hook_test.go
index d9540d5..ec5947b 100644
--- a/hook_test.go
+++ b/hook_test.go
@@ -21,3 +21,299 @@ func TestKey(t *testing.T) {
 	r := KeychartoRawcode("error")
 	tt.Equal(t, 0, r)
 }
+
+func TestUnregister(t *testing.T) {
+	// Setup for tests
+	setupTest := func() {
+		// Reset all global variables to ensure clean state
+		pressed = make(map[uint16]bool, 256)
+		used = []int{}
+		keys = map[int][]uint16{}
+		cbs = map[int]func(Event){}
+		events = map[uint8][]int{}
+	}
+
+	// Mock callback function
+	mockCallback := func(Event) {}
+
+	t.Run("UnregisterExistingHook", func(t *testing.T) {
+		setupTest()
+		// Register a hook
+		Register(KeyDown, []string{"a", "b", "c"}, mockCallback)
+
+		// Verify registration worked
+		if len(events[KeyDown]) != 1 {
+			t.Fatalf("Registration failed, expected 1 event, got %d", len(events[KeyDown]))
+		}
+
+		// Unregister the hook
+		result := Unregister(KeyDown, []string{"a", "b", "c"})
+
+		// Check return value
+		if !result {
+			t.Error("Unregister returned false for existing hook")
+		}
+
+		// Verify hook was removed
+		if len(events[KeyDown]) != 0 {
+			t.Errorf("Unregister failed to remove hook, %d events remain", len(events[KeyDown]))
+		}
+	})
+
+	t.Run("UnregisterNonExistentHook", func(t *testing.T) {
+		setupTest()
+
+		// Unregister a hook that doesn't exist
+		result := Unregister(KeyDown, []string{"x", "y", "z"})
+
+		// Should return false
+		if result {
+			t.Error("Unregister returned true for non-existent hook")
+		}
+	})
+
+	t.Run("UnregisterWithDifferentOrder", func(t *testing.T) {
+		setupTest()
+
+		// Register a hook
+		Register(KeyDown, []string{"ctrl", "alt", "del"}, mockCallback)
+
+		// Unregister with different order
+		result := Unregister(KeyDown, []string{"alt", "ctrl", "del"})
+
+		// Should succeed despite different order
+		if !result {
+			t.Error("Unregister failed when key order was different")
+		}
+
+		// Verify hook was removed
+		if len(events[KeyDown]) != 0 {
+			t.Errorf("Unregister failed to remove hook with different key order, %d events remain", len(events[KeyDown]))
+		}
+	})
+
+	t.Run("UnregisterSpecificHook", func(t *testing.T) {
+		setupTest()
+
+		// Register multiple hooks
+		Register(KeyDown, []string{"a", "b"}, mockCallback)
+		Register(KeyDown, []string{"c", "d"}, mockCallback)
+		Register(KeyUp, []string{"a", "b"}, mockCallback)
+
+		// Unregister one specific hook
+		result := Unregister(KeyDown, []string{"a", "b"})
+
+		// Should succeed
+		if !result {
+			t.Error("Failed to unregister specific hook")
+		}
+
+		// Verify only the specific hook was removed
+		if len(events[KeyDown]) != 1 {
+			t.Errorf("Expected 1 KeyDown event to remain, got %d", len(events[KeyDown]))
+		}
+
+		if len(events[KeyUp]) != 1 {
+			t.Errorf("Expected 1 KeyUp event to remain, got %d", len(events[KeyUp]))
+		}
+	})
+
+	t.Run("RegisterAfterUnregister", func(t *testing.T) {
+		setupTest()
+
+		// Register a hook
+		Register(KeyDown, []string{"a", "b"}, mockCallback)
+
+		// Check original state
+		// origKeyIndex := events[KeyDown][0]
+
+		// Unregister
+		Unregister(KeyDown, []string{"a", "b"})
+
+		// Register a new hook
+		Register(KeyDown, []string{"x", "y"}, mockCallback)
+
+		// Verify new registration worked
+		if len(events[KeyDown]) != 1 {
+			t.Fatalf("Re-registration failed, expected 1 event, got %d", len(events[KeyDown]))
+		}
+
+		// Check that keys were properly registered
+		newKeyIndex := events[KeyDown][0]
+
+		keyAFound := false
+		keyXFound := false
+
+		for _, k := range keys[newKeyIndex] {
+			// Check if key matches 'a' keycode
+			if k == Keycode["a"] {
+				keyAFound = true
+			}
+			// Check if key matches 'x' keycode
+			if k == Keycode["x"] {
+				keyXFound = true
+			}
+		}
+
+		if keyAFound {
+			t.Error("Found old key 'a' in new registration")
+		}
+
+		if !keyXFound {
+			t.Error("New key 'x' not found in registration")
+		}
+	})
+	t.Run("ReregisterSameHook", func(t *testing.T) {
+		setupTest()
+
+		// Mock callback functions to verify they're being called
+		firstCallbackCalled := false
+		secondCallbackCalled := false
+
+		firstCallback := func(Event) {
+			firstCallbackCalled = true
+		}
+
+		secondCallback := func(Event) {
+			secondCallbackCalled = true
+		}
+
+		// First registration
+		Register(KeyDown, []string{"ctrl", "alt", "del"}, firstCallback)
+
+		// Store the original handler index
+		if len(events[KeyDown]) != 1 {
+			t.Fatalf("First registration failed")
+		}
+		originalHandlerIndex := events[KeyDown][0]
+
+		// Verify first registration worked
+		if len(keys[originalHandlerIndex]) != 3 {
+			t.Errorf("Expected 3 keys, got %d", len(keys[originalHandlerIndex]))
+		}
+
+		// Simulate an event to verify the first callback works
+		testEvent := Event{Kind: KeyDown}
+		for _, keyIndex := range events[KeyDown] {
+			// Simulate all keys being pressed
+			for _, keycode := range keys[keyIndex] {
+				pressed[keycode] = true
+			}
+
+			if allPressed(pressed, keys[keyIndex]...) {
+				cbs[keyIndex](testEvent)
+			}
+		}
+
+		if !firstCallbackCalled {
+			t.Error("First callback was not called")
+		}
+
+		// Unregister the hook
+		success := Unregister(KeyDown, []string{"ctrl", "alt", "del"})
+		if !success {
+			t.Fatal("Failed to unregister hook")
+		}
+
+		// Verify unregistration worked
+		if len(events[KeyDown]) != 0 {
+			t.Errorf("Unregister failed, %d events still registered", len(events[KeyDown]))
+		}
+
+		// Re-register the same hook but with a different callback
+		Register(KeyDown, []string{"ctrl", "alt", "del"}, secondCallback)
+
+		// Verify re-registration worked
+		if len(events[KeyDown]) != 1 {
+			t.Fatalf("Re-registration failed")
+		}
+		newHandlerIndex := events[KeyDown][0]
+
+		// Reset callbacks tracking
+		firstCallbackCalled = false
+		secondCallbackCalled = false
+
+		// Simulate an event again
+		for _, keyIndex := range events[KeyDown] {
+			// Simulate all keys being pressed
+			for _, keycode := range keys[keyIndex] {
+				pressed[keycode] = true
+			}
+
+			if allPressed(pressed, keys[keyIndex]...) {
+				cbs[keyIndex](testEvent)
+			}
+		}
+
+		// Verify the correct callback was called
+		if firstCallbackCalled {
+			t.Error("First callback was incorrectly called after re-registration")
+		}
+
+		if !secondCallbackCalled {
+			t.Error("Second callback was not called after re-registration")
+		}
+
+		// Verify the handler index was reused or is different
+		t.Logf("Original handler index: %d, New handler index: %d", originalHandlerIndex, newHandlerIndex)
+		if originalHandlerIndex == newHandlerIndex {
+			// This is not necessarily an error, but good to verify the implementation's behavior
+			t.Log("Handler index was reused (this is implementation-dependent)")
+		} else {
+			t.Log("A new handler index was assigned")
+		}
+	})
+}
+
+func TestEqualKeySlices(t *testing.T) {
+	t.Run("EqualSlicesSameOrder", func(t *testing.T) {
+		a := []uint16{1, 2, 3}
+		b := []uint16{1, 2, 3}
+
+		if !equalKeySlices(a, b) {
+			t.Error("equalKeySlices returned false for identical slices")
+		}
+	})
+
+	t.Run("EqualSlicesDifferentOrder", func(t *testing.T) {
+		a := []uint16{1, 2, 3}
+		b := []uint16{3, 1, 2}
+
+		if !equalKeySlices(a, b) {
+			t.Error("equalKeySlices returned false for slices with same elements in different order")
+		}
+	})
+
+	t.Run("UnequalSlicesDifferentLength", func(t *testing.T) {
+		a := []uint16{1, 2, 3}
+		b := []uint16{1, 2}
+
+		if equalKeySlices(a, b) {
+			t.Error("equalKeySlices returned true for slices with different lengths")
+		}
+	})
+
+	t.Run("UnequalSlicesDifferentElements", func(t *testing.T) {
+		a := []uint16{1, 2, 3}
+		b := []uint16{1, 2, 4}
+
+		if equalKeySlices(a, b) {
+			t.Error("equalKeySlices returned true for slices with different elements")
+		}
+	})
+
+	t.Run("SlicesWithDuplicates", func(t *testing.T) {
+		a := []uint16{1, 2, 2, 3}
+		b := []uint16{3, 1, 2, 2}
+
+		if !equalKeySlices(a, b) {
+			t.Error("equalKeySlices returned false for slices with same elements including duplicates")
+		}
+
+		c := []uint16{1, 2, 3, 3}
+
+		if equalKeySlices(a, c) {
+			t.Error("equalKeySlices returned true for slices with different duplicate patterns")
+		}
+	})
+}