function Invoke-WebTests {
    <#
    .SYNOPSIS
    Helper function that wraps Start-WebTests and sets up the variables needed for Start-WebTests.

    .DESCRIPTION
    This is intended to be used from a TeamCity agent as it uses Invoke-Command -Script {Start-WebTests}
    which are to be run on each web-tier server.

    .PARAMETER Servers
    String CSV of servers to run the Start-WebTests on.

    .PARAMETER AwsProfile
    Aws Profile to use for S3 bucket.

    .PARAMETER EnvironmentType
    Which environment (dev, prod) to run the tests on.  Uses different URLs based on environmentType.

    .PARAMETER SitesToSkip
    A list of sites to skip web tests on. Http/https will be trimmed

    .PARAMETER SkipWidgetWarmup
    Bool to skip warming up the widgets with a throw-away http request to all configured widgets on a site.
    Defaults to true (skip widget warmup).

    .NOTES
    Keeps track of all the tests and will return bool if they all pass or any fail.
    return $PassedAllTests
    #>
    [cmdletbinding()]
    [OutputType([System.Boolean])]
    param(
        [Parameter(Mandatory = $true)]
        [string[]]$Servers,
        [Parameter(Mandatory = $false)]
        [string]$AwsProfile,
        [Parameter(Mandatory = $false)]
        [string[]]$SitesToSkip,
        [Parameter(Mandatory = $false)]
        [bool]$SkipWidgetWarmUp = $true,
        [Parameter(Mandatory = $false)]
        [int]$MaximumSitesToTest = 20,
        [Parameter(Mandatory = $false)]
        [int]$SiteThreads = 4,
        [Parameter(Mandatory = $false)]
        [int]$WidgetThreads = 8,
        [Parameter(Mandatory = $false)]
        [string[]]$ServerTargetOverride
    )

    if([string]::IsNullOrEmpty($AwsProfile)) {
        $AwsProfile = "prod"
    }

    $logLead = (Get-LogLeadName)
    $passedAllTests = $true

    $sitesToSkipArray = @()
    # We do a type check here to determine if this was called directly from TC or not. If yes, clean it up.
    if($null -ne $SitesToSkip -and $SitesToSkip -match ",|\s+") {
        Write-Host "Got called from TC directly. Doing the splits for sites to skip."
        # Split out individual sites, divided by commas or spaces. Ignore blanks.
        $sitesToSkipArray = ($SitesToSkip -split ',|\s+') | Where-Object {("" -ne $_)}
    } else {
        $sitesToSkipArray = $SitesToSkip
    }

    if (![String]::IsNullOrEmpty($ServerTargetOverride)) {
        # Same type check here. Split override servers if there's more than one.
        # Also split servers, because we're coming from TC, so it must be a string as well.
        if(($Servers -match ",") -or ($ServerTargetOverride -match ",|\s+")) {
            Write-Host "Got called from TC directly. Doing the splits for override servers."
            [array]$overrideArray = ($ServerTargetOverride -split ',|\s+') | Where-Object {("" -ne $_)}
            [array]$serverArray = $Servers.split(',')

            Write-Host "$logLead : ServerArray $serverArray"
            Write-Host "$logLead : OverrideArray $overrideArray"
        } else {
            Write-Host "Got Arrays, passing through"
            [array]$overrideArray = $ServerTargetOverride
            [array]$serverArray = $Servers
        }

        $unexpectedServers = $overrideArray.Where{ $_ -notin $serverArray }

        if (($null -ne $unexpectedServers) -and ($unexpectedServers.Count -gt 0)) {
            throw "$logLead : Received unexpected servers/values in the Server Target Override List. Re-examine your parameter list. Unexpected: $unexpectedServers"
        } else {
            $finalServers = $overrideArray
        }
    } else {
        $finalServers = $Servers
    }

    # Get the logins
    try{
        $loginsJson = Get-LoginsToTest -AwsProfile $AwsProfile
    } catch {
        Write-Warning "$logLead : Exception getting logins to test!"
        $ex = $_
        Resolve-Error -ErrorRecord $ex
        Write-Host "$logLead : Setting test results to failed, returning False."
        return $false
    }

    # Get the Urls
    try {
        $coreUrlsJson = Get-CoreUrlsToTest -AwsProfile $AwsProfile
    } catch {
        Write-Warning "$logLead : Exception getting core URLs to test!"
        $ex = $_
        Resolve-Error -ErrorRecord $ex
        Write-Host "$logLead : Setting test results to failed, returning False."
        return $false
    }

    # Kick off the webtests on the servers
    try {
        $serverScriptArguments = @{
            LoginsJson = $loginsJson
            CoreUrlsJson = $coreUrlsJson
            SitesToSkip = $sitesToSkipArray
            MaximumSitesToTest = $MaximumSitesToTest
            SkipWidgetWarmUp = $SkipWidgetWarmUp
            SiteThreads = $SiteThreads
            WidgetThreads = $WidgetThreads
        }

        $results = Invoke-ParallelServers -Servers $finalServers -ReturnObjects -Arguments $serverScriptArguments -Script {
            param($inputArguments)

            $server = (Get-FullyQualifiedServerName)

            $sbLoginsJson = $inputArguments.LoginsJson
            $sbCoreUrlsJson = $inputArguments.CoreUrlsJson
            $sbSitesToSkip = $inputArguments.SitesToSkip
            $sbMaximumSitesToTest = $inputArguments.MaximumSitesToTest
            $sbSkipWidgetWarmUp = $inputArguments.SkipWidgetWarmUp
            $sbSiteThreads = $inputArguments.SiteThreads
            $sbWidgetThreads = $inputArguments.WidgetThreads

            Write-Host "##teamcity[blockOpened name='$server']"

            $result = (Start-WebTests -LoginsJson $sbLoginsJson `
                                   -CoreUrlsJson $sbCoreUrlsJson `
                                   -SitesToSkip $sbSitesToSkip `
                                   -MaximumSitesToTest $sbMaximumSitesToTest `
                                   -SkipWidgetWarmUp $sbSkipWidgetWarmup `
                                   -SiteThreads $sbSiteThreads `
                                   -WidgetThreads $sbWidgetThreads)

            Write-Host "##teamcity[blockClosed name='$server']"

            return $result
        }

        foreach($result in $results) {
            if(!$result) {
                $passedAllTests = $false
            }
        }
    } catch {
        Write-Warning "$logLead : Error during web tests!"
        $ex = $_
        Resolve-Error -ErrorRecord $ex
        Write-Host "$logLead : Setting test results to failed, returning False."
        $passedAllTests = $false
    }

    Write-Host "$logLead : Has passed all tests? : $passedAllTests"
    return $passedAllTests
}