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105 lines
3.2 KiB
CoffeeScript
105 lines
3.2 KiB
CoffeeScript
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UndoManager = require "../src/flux/undo-manager"
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describe "UndoManager", ->
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beforeEach ->
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@undoManager = new UndoManager
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it "Initializes empty", ->
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expect(@undoManager._history.length).toBe 0
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expect(@undoManager._position).toBe -1
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it "can push a history item onto the stack", ->
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@undoManager.immediatelySaveToHistory "A"
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expect(@undoManager._history[0]).toBe "A"
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expect(@undoManager._history.length).toBe 1
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expect(@undoManager.current()).toBe "A"
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it "updates the position", ->
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@undoManager.immediatelySaveToHistory "A"
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expect(@undoManager._position).toBe 0
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describe "when undoing", ->
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beforeEach ->
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@undoManager.immediatelySaveToHistory "A"
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@undoManager.immediatelySaveToHistory "AB"
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@undoManager.immediatelySaveToHistory "ABC"
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it "returns the last item on the stack", ->
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expect(@undoManager.undo()).toBe "AB"
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it "doesn't change the size of the stack", ->
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@undoManager.undo()
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expect(@undoManager._history.length).toBe 3
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it "set the position properly", ->
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@undoManager.undo()
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expect(@undoManager._position).toBe 1
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it "returns null when there's nothing to undo", ->
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@undoManager.undo()
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@undoManager.undo()
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expect(@undoManager.undo()).toBe null
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describe "when redoing", ->
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beforeEach ->
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@undoManager.immediatelySaveToHistory "X"
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@undoManager.immediatelySaveToHistory "XY"
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@undoManager.immediatelySaveToHistory "XYZ"
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it "returns the last item on the stack", ->
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@undoManager.undo()
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expect(@undoManager.redo()).toBe "XYZ"
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it "doesn't change the size of the stack", ->
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@undoManager.undo()
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@undoManager.redo()
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expect(@undoManager._history.length).toBe 3
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it "set the position properly", ->
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@undoManager.undo()
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@undoManager.redo()
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expect(@undoManager._position).toBe 2
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it "returns null when there's nothing to redo", ->
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expect(@undoManager.redo()).toBe null
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describe "when undoing and adding items", ->
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beforeEach ->
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@undoManager.immediatelySaveToHistory "1"
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@undoManager.immediatelySaveToHistory "12"
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@undoManager.immediatelySaveToHistory "123"
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@undoManager.immediatelySaveToHistory "1234"
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@undoManager.undo()
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@undoManager.undo()
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@undoManager.immediatelySaveToHistory "A"
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it "correctly sets the history", ->
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expect(@undoManager._history).toEqual ["1", "12", "A"]
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it "correctly sets the length", ->
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expect(@undoManager._history.length).toBe 3
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it "puts the correct items on the stack", ->
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@undoManager.undo()
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expect(@undoManager.redo()).toBe "A"
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it "sets the position correctly", ->
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expect(@undoManager._position).toBe 2
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describe "when the stack is full", ->
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beforeEach ->
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@undoManager._MAX_HISTORY_SIZE = 2
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@undoManager.immediatelySaveToHistory "A"
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@undoManager.immediatelySaveToHistory "AB"
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@undoManager.immediatelySaveToHistory "ABC"
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@undoManager.immediatelySaveToHistory "ABCD"
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it "correctly sets the length", ->
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expect(@undoManager._history.length).toBe 2
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it "keeps the latest histories", ->
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expect(@undoManager._history).toEqual ["ABC", "ABCD"]
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it "updates the position", ->
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expect(@undoManager._position).toBe 1
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