The term 'Assert-CI' is not recognized (VS2013 image)

[Farwaykorse]

When importing the module on the AppVeyor image: "Visual Studio 2013" an error is displayed:

Import-Module -Name .\AppVeyorHelpers.psd1
Assert-CI : The term 'Assert-CI' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\projects\appveyorhelpers\AppVeyorGeneral\Send-Message.psm1:140 char:9
+     if (Assert-CI) {
+         ~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Assert-CI:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

All tests seem to pass regardless.

See: AppVeyor Build 81