How to use sh:rule and sh:count correctly - sparql

Question

Here is my data.ttl:
#prefix : <http://example.com/ns#> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
:Bob a :Student ;
:name "Bob" ;
:tookTest :Test1, :Test2, :Test3, :Test4, :Test5 .
:Test1 a :Test ;
:grade "A" .
:Test2 a :Test ;
:grade "A" .
:Test3 a :Test ;
:grade "A" .
:Test4 a :Test ;
:grade "C" .
:Test5 a :Test ;
:grade "D" .
the shacl.ttl is:
#prefix : <http://example.com/ns#> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
#prefix sh: <http://www.w3.org/ns/shacl#> .
:Test a rdfs:Class, sh:NodeShape .
:Student a rdfs:Class, sh:NodeShape ;
sh:rule [
a sh:TripleRule ;
sh:subject sh:this ;
sh:predicate :rating ;
sh:object [sh:count [sh:path :Test] ];
] .
and I use shacl inferance engine (https://github.com/TopQuadrant/shacl):
shaclinfer.bat -datafile D:\data.ttl -shapesfile D:\shacl.ttl>D:\report.txt
I get a result report as:
<http://example.com/ns#Bob>
<http://example.com/ns#rating> 0 .
I actually want to implement the following rule:
if Bob get more than 2 "A", then--> :Bob :rating "Outstanding" .
How do I write this sh:condition statement correctly?
In this case sh:count should calculate the number of Test which grade="A",Do I have to use sparql CONSTRUCT statements?
Thanks for any help!

Answer 1

#prefix : <http://example.com/ns#> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
#prefix sh: <http://www.w3.org/ns/shacl#> .
:Test a rdfs:Class, sh:NodeShape .
:Student a rdfs:Class, sh:NodeShape ;
sh:rule [
a sh:TripleRule ;
sh:subject sh:this ;
sh:predicate :rating ;
sh:object "Outstanding";
sh:condition :Student ;
sh:condition [
sh:qualifiedValueShape [
sh:path (:tookTest :grade ) ;
sh:hasValue "A" ; ] ;
sh:qualifiedMinCount 2 ; ];
] .
The shacl.ttl looks close to correct, but it get error by engine of https://github.com/TopQuadrant/shacl, the error message as follows:
Exception in thread "main" org.apache.jena.query.QueryParseException: Line 2, column 1: Unresolved prefixed name: :tookTest
Would anyone please test this with any of the other SHACL inference engines?