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132 lines
4.7 KiB
CoffeeScript
132 lines
4.7 KiB
CoffeeScript
_ = require 'underscore'
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EventEmitter = require('events').EventEmitter
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ModelView = require '../src/flux/stores/model-view'
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# ModelView is an abstract base class. Basic implementation for tests
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class TestModelView extends ModelView
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constructor: ->
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super
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@_pageSize = 100
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count: ->
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1000
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stubFillPage: (page) ->
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letter = ['A','B','C','D','E','F','G','H','I','J'][page]
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items = []
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items.push({id: "#{letter}#{ii}"}) for ii in [0..99]
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@_pages[page] =
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loading: false
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items: items
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retrievePage: (page) ->
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@_pages[page] =
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items: []
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loading: true
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setTimeout ->
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@stubFillPage(page)
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, 1
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describe "ModelView", ->
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beforeEach ->
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@view = new TestModelView()
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describe "setRetainedRange", ->
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it "should perform basic bounds checks to avoid fetching non-existent pages", ->
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@view.setRetainedRange({start: -100, end: 15000})
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expect(@view._retainedRange).toEqual({start:0, end: @view.count()})
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it "should call the padding method to optionally expand the retained range", ->
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spyOn(@view, 'padRetainedRange').andCallFake ({start, end}) ->
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{start: start - 50, end: end + 50}
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@view.setRetainedRange({start: 0, end: 100})
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expect(@view._retainedRange).toEqual({start:0, end: 150})
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it "should retrieve pages in the range that are not cached", ->
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spyOn(@view, 'retrievePage').andCallThrough()
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@view.setRetainedRange({start: 0, end: 250})
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expect(@view.retrievePage.callCount).toBe(3)
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expect(@view.retrievePage.calls[0].args).toEqual([0])
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expect(@view.retrievePage.calls[1].args).toEqual([1])
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expect(@view.retrievePage.calls[2].args).toEqual([2])
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it "should not retrieve pages that are already cached", ->
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@view.stubFillPage(0)
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@view.stubFillPage(1)
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spyOn(@view, 'retrievePage').andCallThrough()
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@view.setRetainedRange({start: 0, end: 250})
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expect(@view.retrievePage.callCount).toBe(1)
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expect(@view.retrievePage.calls[0].args).toEqual([2])
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it "should call cullPages(), allowing subclasses to remove unneeded pages from the cache", ->
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spyOn(@view, 'cullPages')
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@view.setRetainedRange({start: 0, end: 250})
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expect(@view.cullPages).toHaveBeenCalled()
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describe "accessors", ->
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beforeEach ->
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@view.stubFillPage(0)
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@view.stubFillPage(1)
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describe "loaded", ->
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it "should return true if all of the retained pages are loaded", ->
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@view.setRetainedRange({start: 0, end: 100})
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expect(@view.loaded()).toBe(true)
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it "should return false if any retained pages are still loading", ->
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@view.setRetainedRange({start: 0, end: 300})
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expect(@view.loaded()).toBe(false)
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describe "get", ->
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it "should return the item at the index provided", ->
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expect(@view.get(12).id).toBe('A12')
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expect(@view.get(112).id).toBe('B12')
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it "should return null if the item cannot be found", ->
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expect(@view.get(12154)).toBe(null)
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it "should throw an exception if the user passes something other than an integer index", ->
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expect(( => @view.get('oops an id'))).toThrow()
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describe "getById", ->
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it "should return the item with the requested id", ->
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expect(@view.getById('A88')).toEqual({id: 'A88'})
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expect(@view.getById('B12')).toEqual({id: 'B12'})
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it "should return null if the item cannot be found", ->
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expect(@view.getById('E12')).toEqual(null)
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it "should return null if no id is provided", ->
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expect(@view.getById(undefined)).toEqual(null)
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describe "indexOfId", ->
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it "should return the index of the item with the id", ->
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expect(@view.indexOfId('A88')).toEqual(88)
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expect(@view.indexOfId('B12')).toEqual(100 * 1 + 12)
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it "should return -1 if the item cannot be found", ->
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expect(@view.indexOfId('E12')).toEqual(-1)
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it "should return -1 if no id is provided", ->
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expect(@view.indexOfId(undefined)).toEqual(-1)
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describe "pagesRetained", ->
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it "should return an array of page indexes currently being maintained", ->
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@view._retainedRange = {start: 0, end: 99}
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expect(@view.pagesRetained()).toEqual([0])
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@view._retainedRange = {start: 0, end: 340}
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expect(@view.pagesRetained()).toEqual([0..3])
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@view._retainedRange = {start: 900, end: 999}
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expect(@view.pagesRetained()).toEqual([9])
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describe "invalidateRetainedRange", ->
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it "should initiate requests for all the pages in the retained range", ->
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spyOn(@view, 'retrievePage')
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@view._retainedRange = {start: 0, end: 340}
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@view.invalidateRetainedRange()
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expect(@view.retrievePage.callCount).toBe(4)
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for i in [0..3]
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expect(@view.retrievePage.calls[i].args).toEqual([i])
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