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Versions: 32
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Stored size: 1.91 KB
Contents
describe "Mercury.HistoryBuffer", ->
beforeEach ->
@buffer = new Mercury.HistoryBuffer(5)
afterEach ->
@buffer = null
delete(@buffer)
describe "constructor", ->
it "accepts a max length", ->
expect(@buffer.maxLength).toEqual(5)
it "initializes an empty stack", ->
expect(@buffer.index).toEqual(0)
expect(@buffer.stack).toEqual([])
describe "#push", ->
it "won't duplicate items if the content is the same", ->
@buffer.push('1')
expect(@buffer.stack).toEqual(['1'])
@buffer.push('2<em class="mercury-marker"></em>')
expect(@buffer.stack).toEqual(['1', '2<em class="mercury-marker"></em>'])
it "pushes onto the stack where it should", ->
@buffer.push('1')
@buffer.push('2')
expect(@buffer.stack).toEqual(['1', '2'])
@buffer.index = 0
@buffer.push('3')
expect(@buffer.stack).toEqual(['1', '3'])
it "keeps the number of items within the max length by dropping the oldest items", ->
@buffer.push('1')
@buffer.push('2')
@buffer.push('3')
@buffer.push('4')
@buffer.push('5')
expect(@buffer.stack).toEqual(['1', '2', '3', '4', '5'])
@buffer.push('6')
expect(@buffer.stack).toEqual(['2', '3', '4', '5', '6'])
describe "#undo", ->
beforeEach ->
@buffer.push('1')
@buffer.push('2')
it "returns the correct item", ->
expect(@buffer.undo()).toEqual('1')
it "returns null if there are no more items to undo", ->
expect(@buffer.undo()).toEqual('1')
expect(@buffer.undo()).toEqual(null)
describe "#redo", ->
beforeEach ->
@buffer.push('1')
@buffer.push('2')
it "returns the correct item", ->
@buffer.undo()
expect(@buffer.redo()).toEqual('2')
it "returns null if there are no more items to redo", ->
@buffer.undo()
expect(@buffer.redo()).toEqual('2')
expect(@buffer.redo()).toEqual(null)
Version data entries
32 entries across 32 versions & 3 rubygems