PS: Add a failing test.

Author: MathiasVP

powershell/ql/test/library-tests/dataflow/pipeline/test.ps1

@@ -37,4 +37,14 @@ function consumeValueFromPipelineByPropertyNameWithoutProcess {
 }
 
 $x = Source "8"
-[pscustomobject]@{x = $x} | consumeValueFromPipelineByPropertyNameWithoutProcess
+[pscustomobject]@{x = $x} | consumeValueFromPipelineByPropertyNameWithoutProcess
+
+function consumeValueFromPipelineByPropertyNameWithProcess {
+    Param([Parameter(ValueFromPipelineByPropertyName)] $x)
+
+    process {
+        Sink $x # $ MISSING: hasValueFlow=9 hasValueFlow=10 hasValueFlow=11
+    }
+}
+
+[pscustomobject]@{x = Source "9"}, [pscustomobject]@{x = Source "10"}, [pscustomobject]@{x = Source "11"} | consumeValueFromPipelineByPropertyNameWithProcess