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Make randomized presenter spec failures easier to reproduce

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This commit is contained in:
Nathan Sobo 2015-02-04 10:05:47 -07:00
parent 5bb3095ffa
commit 1ae25ed85d
1 changed files with 54 additions and 44 deletions
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54
spec/text-editor-presenter-spec.coffee
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@ -1763,17 +1763,28 @@ describe "TextEditorPresenter", ->
expect(presenter.state.height).toBe editor.getScreenLineCount() * 20 expect(presenter.state.height).toBe editor.getScreenLineCount() * 20
describe "when the model and view measurements are mutated randomly", -> describe "when the model and view measurements are mutated randomly", ->
[editor, buffer, presenter, presenterParams] = [] [editor, buffer, presenterParams, presenter, statements] = []
it "correctly maintains the presenter state", -> it "correctly maintains the presenter state", ->
_.times 10, -> _.times 20, ->
waits(0) waits(0)
runs -> runs ->
performSetup()
_.times 20, ->
performRandomAction (statement) -> statements.push(statement)
expectValidState()
performTeardown()
xit "works correctly for a particular stream of random actions", ->
performSetup()
# paste output from failing spec here
expectValidState()
performTeardown()
performSetup = ->
buffer = new TextBuffer buffer = new TextBuffer
editor = new TextEditor({buffer}) editor = new TextEditor({buffer})
editor.setEditorWidthInChars(80) editor.setEditorWidthInChars(80)
presenterParams = presenterParams =
model: editor model: editor
height: 50 height: 50
@ -1783,14 +1794,16 @@ describe "TextEditorPresenter", ->
lineHeight: 10 lineHeight: 10
baseCharacterWidth: 10 baseCharacterWidth: 10
lineOverdrawMargin: 1 lineOverdrawMargin: 1
horizontalScrollbarHeight: 5
verticalScrollbarWidth: 5
presenter = new TextEditorPresenter(presenterParams) presenter = new TextEditorPresenter(presenterParams)
referencePresenter = new TextEditorPresenter(presenterParams) statements = []
expect(presenter.state).toEqual referencePresenter.state
actions = [] performTeardown = ->
_.times 30, -> buffer.destroy()
performRandomAction (action) -> actions.push(action)
expectValidState = ->
presenterParams.scrollTop = presenter.scrollTop
actualState = presenter.state actualState = presenter.state
expectedState = new TextEditorPresenter(presenterParams).state expectedState = new TextEditorPresenter(presenterParams).state
delete actualState.content.scrollingVertically delete actualState.content.scrollingVertically
@ -1803,14 +1816,15 @@ describe "TextEditorPresenter", ->
console.log "Uncomment code below this line to see a JSON diff" console.log "Uncomment code below this line to see a JSON diff"
# {diff} = require 'json-diff' # !!! Run `npm install json-diff` in your `atom/` repository # {diff} = require 'json-diff' # !!! Run `npm install json-diff` in your `atom/` repository
# console.log "Difference:", diff(actualState, expectedState) # console.log "Difference:", diff(actualState, expectedState)
console.log "" if statements.length > 0
console.log "Actions:" console.log """
console.log action for action in actions =====================================================
console.log "" Paste this code into the disabled spec in this file (and enable it) to repeat this failure:
console.log "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
throw new Error("Unexpected presenter state after random mutation. Check console output for details.")
buffer.destroy() #{statements.join('\n')}
=====================================================
"""
throw new Error("Unexpected presenter state after random mutation. Check console output for details.")
performRandomAction = (log) -> performRandomAction = (log) ->
getRandomElement([ getRandomElement([
@ -1826,11 +1840,7 @@ describe "TextEditorPresenter", ->
changeScrollTop = (log) -> changeScrollTop = (log) ->
scrollHeight = presenterParams.lineHeight * editor.getScreenLineCount() scrollHeight = presenterParams.lineHeight * editor.getScreenLineCount()
newScrollTop = Math.max(0, _.random(0, scrollHeight - presenterParams.height)) newScrollTop = Math.max(0, _.random(0, scrollHeight - presenterParams.height))
log """ log "presenter.setScrollTop(#{newScrollTop})"
presenterParams.scrollTop = #{newScrollTop}
presenter.setScrollTop(#{newScrollTop})
"""
presenterParams.scrollTop = newScrollTop
presenter.setScrollTop(newScrollTop) presenter.setScrollTop(newScrollTop)
changeScrollLeft = (log) -> changeScrollLeft = (log) ->