param(
    [Parameter(Mandatory = $true)]
    [string]$FileToTest,

    [Parameter(Mandatory = $false)]
    [switch]$Coverage,

    [Parameter(Mandatory = $false)]
    [switch]$Fast
)

Write-Host "File to Test: $FileToTest"

$FileToTest = Resolve-Path $FileToTest
$fileName = Split-Path $FileToTest -leaf
$filePath = Split-Path $FileToTest -Parent

if ($fileName -like "*.tests.ps1") {

    $functionFile = $FileToTest -replace "\.tests\.ps1", ".ps1"
    $testFile = $FileToTest    

} else {
    
    $functionFile = $FileToTest
    $testFileName = $fileName -replace "\.ps1$", ".tests.ps1"
    $testFile = Join-Path $filePath $testFileName
}

Write-Host "Test File: $testFile"
Write-Host "Function: $functionFile"

if ($Coverage.IsPresent) {

    #$coverageFile = ($functionFile + ".coverage.xml")
    $coverageFile = Join-Path $PSScriptRoot "coverage.xml"
    Write-Host "Coverage File: $coverageFile"
}

$testArray = @{ Path =  "$testFile"; Parameters = @{ TestSingleFile = $true; FunctionPath = $functionFile } }
Write-Host "Test Parameters:"
($testArray | ConvertTo-JSON -Depth 3)
Write-Host ""

if ($null -eq $coverageFile) {

    Write-Host "Invoking: Invoke-Pester -Script <<TestArray>>"
    Invoke-Pester -Script $testArray

} else {

    Write-Host "Invoking: Invoke-Pester -Script <<TestArray>> -CodeCoverage `"$functionFile`" -CodeCoverageOutputFile `"$coverageFile`""
    Invoke-Pester -Script $testArray -CodeCoverage "$functionFile" -CodeCoverageOutputFile "$coverageFile"
}