Fixed diagnostics files uri handling, added low-level tests

test/resources/repos/powershell/test_repo/diagnostics_sample.ps1

@@ -1,9 +1,4 @@
 function Invoke-BrokenFactory {
-    Invoke-MissingGreeting
-}
-
-function Invoke-BrokenConsumer {
-    $value = Invoke-BrokenFactory
-    Write-Output $value
-    Invoke-MissingConsumerValue
+    if ($true) {
+        Write-Output "broken"
 }