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diff --git a/specs/Specs/AppStateSpec.hs b/specs/Specs/AppStateSpec.hs
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+module Specs.AppStateSpec where
+
+import Chelleport.AppState (initialState, update)
+import Chelleport.Types
+import Chelleport.Utils (uniq)
+import Control.Monad (join)
+import qualified SDL
+import Test.Hspec
+import TestUtils
+
+test :: SpecWith ()
+test = do
+  describe "#initialState" $ do
+    it "returns the initial state of the app" $ do
+      ((initState, _), _) <- runWithMocks initialState
+      stateKeySequence initState `shouldBe` []
+      stateIsMatched initState `shouldBe` False
+      stateIsShiftPressed initState `shouldBe` False
+
+    it "returns grid with 16x9 key sequences" $ do
+      ((initState, _), _) <- runWithMocks initialState
+      length (stateGrid initState) `shouldBe` 9
+      stateGrid initState `shouldSatisfy` all ((== 16) . length)
+      stateGrid initState `shouldSatisfy` all (all ((== 2) . length))
+
+    it "returns grid with all unique key sequences" $ do
+      ((initState, _), _) <- runWithMocks initialState
+      join (stateGrid initState) `shouldBe` uniq (join $ stateGrid initState)
+
+  describe "#update" $ do
+    let defaultState = defaultAppState {stateGrid = [["ABC", "DEF"], ["DJK", "JKL"]]}
+
+    context "with action ChainMouseClick" $ do
+      let currentState = defaultState
+
+      it "hides window, triggers mouse click and shows the window again" $ do
+        (_, mock) <- runWithMocks $ update currentState $ ChainMouseClick LeftClick
+        calls mock `shouldBe` [Mock_hideWindow, Mock_clickMouseButton LeftClick, Mock_showWindow]
+
+      it "continues with action ResetKeys without updating state" $ do
+        ((nextState, action), _) <- runWithMocks $ update currentState $ ChainMouseClick LeftClick
+        action `shouldBe` Just ResetKeys
+        nextState `shouldBe` currentState
+
+      context "when repetition is more than 1" $ do
+        let currentState = defaultState {stateRepetition = 3}
+
+        it "resets repetition back to 1" $ do
+          ((nextState, _), _) <- runWithMocks $ update currentState $ ChainMouseClick LeftClick
+          nextState `shouldBe` currentState {stateRepetition = 1}
+
+        it "clicks multiple times" $ do
+          (_, mock) <- runWithMocks $ update currentState $ ChainMouseClick LeftClick
+          calls mock
+            `shouldBe` [ Mock_hideWindow,
+                         Mock_clickMouseButton LeftClick,
+                         Mock_clickMouseButton LeftClick,
+                         Mock_clickMouseButton LeftClick,
+                         Mock_showWindow
+                       ]
+
+      context "when repetition is 0" $ do
+        let currentState = defaultState {stateRepetition = 0}
+
+        it "clicks just once" $ do
+          (_, mock) <- runWithMocks $ update currentState $ ChainMouseClick LeftClick
+          calls mock `shouldBe` [Mock_hideWindow, Mock_clickMouseButton LeftClick, Mock_showWindow]
+
+    context "with action IncrementHighlightIndex" $ do
+      let currentState = defaultState
+
+      it "todo: implement" $ do
+        1 `shouldBe` 1
+
+    context "with action IncrementMouseCursor" $ do
+      let currentState = defaultState
+
+      it "continues with MoveMousePosition" $ do
+        ((_, action), _) <- runWithMocks $ update currentState $ IncrementMouseCursor (10, -5)
+        action `shouldBe` Just (MoveMousePosition (52, 37))
+
+      it "does update state" $ do
+        ((state, _), _) <- runWithMocks $ update currentState $ IncrementMouseCursor (10, -5)
+        state `shouldBe` currentState
+
+      context "when repetition is more than 1" $ do
+        let currentState = defaultState {stateRepetition = 5}
+
+        it "multiplies increment" $ do
+          ((_, action), _) <- runWithMocks $ update currentState $ IncrementMouseCursor (10, -5)
+          action `shouldBe` Just (MoveMousePosition (92, 17))
+
+      context "when repetition is 0" $ do
+        let currentState = defaultState {stateRepetition = 0}
+
+        it "increments just once" $ do
+          ((_, action), _) <- runWithMocks $ update currentState $ IncrementMouseCursor (10, -5)
+          action `shouldBe` Just (MoveMousePosition (52, 37))
+
+    context "with action MouseDragEnd" $ do
+      let currentState = defaultState
+
+      it "hides window, stops dragging and shows the window again" $ do
+        (_, mock) <- runWithMocks $ update currentState MouseDragEnd
+        calls mock `shouldContain` [Mock_hideWindow, Mock_releaseMouseButton, Mock_showWindow]
+
+      it "does not continue or update state" $ do
+        (result, _) <- runWithMocks $ update currentState MouseDragStart
+        result `shouldBe` (currentState, Nothing)
+
+    context "with action MouseDragStart" $ do
+      let currentState = defaultState
+
+      it "hides window, starts dragging and shows the window again" $ do
+        (_, mock) <- runWithMocks $ update currentState MouseDragStart
+        calls mock `shouldContain` [Mock_hideWindow, Mock_pressMouseButton, Mock_showWindow]
+
+      it "does not continue or update state" $ do
+        (result, _) <- runWithMocks $ update currentState MouseDragStart
+        result `shouldBe` (currentState, Nothing)
+
+    context "with action MouseDragToggle" $ do
+      context "when is dragging is true" $ do
+        let currentState = defaultState {stateIsDragging = True}
+
+        it "toggles dragging state" $ do
+          ((state, _), _) <- runWithMocks $ update currentState MouseDragToggle
+          state `shouldBe` state {stateIsDragging = False}
+
+        it "continues with action MouseDragEnd" $ do
+          ((_, action), _) <- runWithMocks $ update currentState MouseDragToggle
+          action `shouldBe` Just MouseDragEnd
+
+      context "when is dragging is false" $ do
+        let currentState = defaultState {stateIsDragging = False}
+
+        it "toggles dragging state" $ do
+          ((state, _), _) <- runWithMocks $ update currentState MouseDragToggle
+          state `shouldBe` state {stateIsDragging = True}
+
+        it "continues with action MouseDragStart" $ do
+          ((_, action), _) <- runWithMocks $ update currentState MouseDragToggle
+          action `shouldBe` Just MouseDragStart
+
+    context "with action HandleKeyInput" $ do
+      context "when mode is ModeSearch" $ do
+        it "todo: implement" $ do
+          1 `shouldBe` 1
+
+      context "when mode is ModeHints" $ do
+        context "when there are no matches" $ do
+          let currentState = defaultState {stateKeySequence = "D", stateMode = defaultHintsMode}
+
+          context "when input key sequence has matching values in grid" $ do
+            it "does not update" $ do
+              ((nextState, action), _) <- runWithMocks $ update currentState $ HandleKeyInput SDL.KeycodeZ
+              action `shouldBe` Nothing
+              nextState `shouldBe` currentState
+
+          context "when input key sequence does not have matching values in grid" $ do
+            it "adds key to key sequence" $ do
+              ((nextState, action), _) <- runWithMocks $ update currentState $ HandleKeyInput SDL.KeycodeE
+              action `shouldBe` Nothing
+              nextState `shouldBe` currentState {stateKeySequence = "DE"}
+
+        context "when there is a matches" $ do
+          let currentState = defaultState {stateKeySequence = "DE", stateMode = defaultHintsMode}
+
+          context "when input key sequence does not have matching values in grid" $ do
+            it "adds key to key sequence and enables isMatched" $ do
+              ((nextState, _), _) <- runWithMocks $ update currentState $ HandleKeyInput SDL.KeycodeF
+              nextState `shouldBe` currentState {stateKeySequence = "DEF", stateIsMatched = True}
+
+            it "continues with MoveMousePosition action at center of matched cell" $ do
+              ((_, action), _) <- runWithMocks $ update currentState $ HandleKeyInput SDL.KeycodeF
+              action `shouldBe` Just (MoveMousePosition (1640, 370))
+
+    context "with action MoveMousePosition" $ do
+      let currentState = defaultState
+
+      it "moves mouse pointer to the given coordinates" $ do
+        (_, mock) <- runWithMocks $ update currentState $ MoveMousePosition (23, 320)
+        mock `shouldHaveCalled` Mock_moveMousePointer 23 320
+
+      it "does not continue or update state" $ do
+        (result, _) <- runWithMocks $ update currentState $ MoveMousePosition (0, 0)
+        result `shouldBe` (currentState, Nothing)
+
+    context "with action ResetKeys" $ do
+      let currentState = defaultState {stateRepetition = 5}
+
+      it "resets state without any action" $ do
+        ((nextState, action), _) <- runWithMocks $ update currentState ResetKeys
+        action `shouldBe` Nothing
+        nextState `shouldBe` currentState {stateKeySequence = [], stateIsMatched = False, stateRepetition = 1}
+
+    context "with action SetMode" $ do
+      let currentState = defaultState
+
+      context "when mode is ModeHints" $ do
+        it "updates mode in state" $ do
+          ((nextState, action), _) <- runWithMocks $ update currentState $ SetMode defaultHintsMode
+          nextState `shouldBe` currentState {stateMode = defaultHintsMode}
+          action `shouldBe` Nothing
+
+      context "when mode is ModeSearch" $ do
+        it "captures screenshot for word search" $ do
+          ((_, _), mock) <- runWithMocks $ update currentState $ SetMode defaultSearchMode
+          mock `shouldHaveCalled` Mock_captureScreenshot (mockWindowOffsetX, mockWindowOffsetY) (mockWindowWidth, mockWindowHeight)
+
+        it "updates mode in state with ocr words" $ do
+          ((nextState, _), _) <- runWithMocks $ update currentState $ SetMode defaultSearchMode
+          let matchWord = OCRMatch {matchStartX = 40, matchStartY = 5, matchEndX = 100, matchEndY = 20, matchText = "Wow"}
+          nextState `shouldBe` currentState {stateMode = defaultSearchMode {searchWords = [matchWord], searchFilteredWords = [matchWord]}}
+
+    context "with action ShutdownApp" $ do
+      let currentState = defaultState
+
+      it "shuts down app" $ do
+        (_, mock) <- runWithMocks $ update currentState ShutdownApp
+        mock `shouldHaveCalled` Mock_shutdownApp
+
+      it "does not continue or update state" $ do
+        (result, _) <- runWithMocks $ update currentState ShutdownApp
+        result `shouldBe` (currentState, Nothing)
+
+    context "with action TriggerMouseClick" $ do
+      let currentState = defaultState
+
+      it "hides window and triggers mouse click" $ do
+        (_, mock) <- runWithMocks $ update currentState $ TriggerMouseClick LeftClick
+        calls mock `shouldContain` [Mock_hideWindow, Mock_clickMouseButton LeftClick]
+
+      it "continues with action ShutdownApp without updating state" $ do
+        ((nextState, action), _) <- runWithMocks $ update currentState $ TriggerMouseClick LeftClick
+        action `shouldBe` Just ShutdownApp
+        nextState `shouldBe` currentState
+
+      context "when repetition is more than 1" $ do
+        let currentState = defaultState {stateRepetition = 3}
+
+        it "resets repetition back to 1" $ do
+          ((nextState, _), _) <- runWithMocks $ update currentState $ TriggerMouseClick LeftClick
+          nextState `shouldBe` currentState {stateRepetition = 1}
+
+        it "clicks multiple times" $ do
+          (_, mock) <- runWithMocks $ update currentState $ TriggerMouseClick LeftClick
+          calls mock
+            `shouldBe` [ Mock_hideWindow,
+                         Mock_clickMouseButton LeftClick,
+                         Mock_clickMouseButton LeftClick,
+                         Mock_clickMouseButton LeftClick
+                       ]
+
+      context "when repetition is 0" $ do
+        let currentState = defaultState {stateRepetition = 0}
+
+        it "clicks just once" $ do
+          (_, mock) <- runWithMocks $ update currentState $ TriggerMouseClick LeftClick
+          calls mock `shouldBe` [Mock_hideWindow, Mock_clickMouseButton LeftClick]
+
+    context "with action UpdateRepetition" $ do
+      let currentState = defaultState
+
+      it "updates shift state without any action" $ do
+        ((nextState, action), _) <- runWithMocks $ update currentState $ UpdateRepetition 7
+        action `shouldBe` Nothing
+        nextState `shouldBe` currentState {stateRepetition = 7}
+
+    context "with action UpdateShiftState" $ do
+      let currentState = defaultState
+
+      it "updates shift state without any action" $ do
+        ((nextState, action), _) <- runWithMocks $ update currentState $ UpdateShiftState True
+        action `shouldBe` Nothing
+        nextState `shouldBe` currentState {stateIsShiftPressed = True}