Fix handling of dependencies and other minor issues

FeatureFlags.psm1

@@ -18,23 +18,27 @@ function Get-FeatureFlagConfigFromFile([string]$jsonConfigPath) {
 }
 
 # Import the JSON and JSON schema libraries, and load the JSON schema.
-# TODO: don't rely on versioned paths. Use dotnet build / pack properly.
-$schemaLibPath = Join-Path -Path $PSScriptRoot -ChildPath "External/njsonschema/9.13.19/lib/netstandard1.0/NJsonSchema.dll"
+$libs = Get-ChildItem -Recurse -Path "$PSScriptRoot/External"
+$libs = $libs | Where-Object {$_.Extension -ieq ".dll" -and $_.FullName -ilike "*netstandard1.0*"} | ForEach-Object {$_.FullName}
+$schemaLibPath = $libs | Where-Object {$_ -ilike "*NJsonSchema.dll"}
 if (-not (Test-Path -Path $schemaLibPath -PathType Leaf)) {
     Write-Error "Could not find the DLL for NJSonSchema: $schemaLibPath"
 }
+Write-Verbose "Found NJsonSchema assembly at $schemaLibPath"
 
-$jsonLibPath = Join-Path -Path $PSScriptRoot -ChildPath "External/newtonsoft.json/9.0.1/lib/netstandard1.0/Newtonsoft.Json.dll"
+$jsonLibPath = $libs | Where-Object {$_ -ilike "*Newtonsoft.Json.dll"}
 if (-not (Test-Path -Path $jsonLibPath -PathType Leaf)) {
     Write-Error "Could not find the DLL for Newtonsoft.Json: $jsonLibPath"
 }
+Write-Verbose "Found JSON.Net assembly at $jsonLibPath"
 
 try {
-    Add-Type -Path $jsonLibPath
-    Add-Type -Path $schemaLibPath
+    $jsonType = Add-Type -Path $jsonLibPath -PassThru
+    $jsonSchemaType = Add-Type -Path $schemaLibPath -PassThru
+    Write-Verbose "JSON.Net type: $jsonType"
+    Write-Verbose "NjsonSchema type: $jsonSchemaType"
 } catch {
-    Write-Error "Error loading JSON libraries"
-    Write-Host $_.Exception.LoaderExceptions
+    Write-Error "Error loading JSON libraries ($jsonLibPath, $schemaLibPath): $($_.Exception.Message)"
 }
 
 $script:schema = $null

PowerShell-FeatureFlags.csproj

@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <!-- TODO: target .NET Standard 2.0 -->
     <TargetFramework>netstandard1.0</TargetFramework>
     <AssemblyName>PowerShell_FeatureFlags</AssemblyName>
     <!-- Make sure dependencies are always copied in the output folder. 

tools/run-tests.ps1

@@ -2,7 +2,11 @@
 $parentDir = Split-Path -Parent (Split-Path -Parent $PSCommandPath)
 $testDir = Join-Path $parentDir -ChildPath "test"
 
-Install-Module Pester -Force -Scope CurrentUser
+$pester = Get-Module -ListAvailable | Where-Object {$_.Name -eq "Pester" -and $_.Version -gt '4.0.0'}
+if ($pester.Count -eq 0) {
+    Write-Host "Cannot find the Pester module. Installing it."
+    Install-Module Pester -Force -Scope CurrentUser
+}
 $FailedTests = Invoke-Pester $testDir -EnableExit
 if ($FailedTests -gt 0) {
     Write-Error "Error: $FailedTests Pester tests failed."