Test to validate expansion list.
user
```coffeescript
common = require './common'

common.setup()

casper.test.begin "Validate Expansions", (test) ->
    valid_expansions = [
        "A-Wing Expansion Pack"
        "B-Wing Expansion Pack"
        "Core"
        "E-Wing Expansion Pack"
        "HWK-290 Expansion Pack"
        "Imperial Aces Expansion Pack"
        "Lambda-Class Shuttle Expansion Pack"
        "Millennium Falcon Expansion Pack"
        "Rebel Aces Expansion Pack"
        "Rebel Transport Expansion Pack"
        "Slave I Expansion Pack"
        "TIE Advanced Expansion Pack"
        "TIE Bomber Expansion Pack"
        "TIE Defender Expansion Pack"
        "TIE Fighter Expansion Pack"
        "TIE Interceptor Expansion Pack"
        "TIE Phantom Expansion Pack"
        "Tantive IV Expansion Pack"
        "VT-49 Decimator Expansion Pack"
        "X-Wing Expansion Pack"
        "Y-Wing Expansion Pack"
        "YT-2400 Freighter Expansion Pack"
        "Z-95 Headhunter Expansion Pack"
    ]

    common.waitForStartup('#rebel-builder')
    .then ->
        expansions = @evaluate ->
            expansions
        for expansion in expansions
            test.assert expansion in valid_expansions, "#{expansion} is valid"

    .run ->
        test.done()
```
assistant