Adds an update test about dirty reads

testsuite/oxigraph-tests/sparql/manifest.ttl

@@ -3,6 +3,7 @@
 @prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix mf:    <http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#> .
 @prefix qt:    <http://www.w3.org/2001/sw/DataAccess/tests/test-query#> .
+@prefix ut:     <http://www.w3.org/2009/sparql/tests/test-update#> .
 
 <>  rdf:type mf:Manifest ;
     rdfs:label "Oxigraph SPARQL tests" ;
@@ -17,6 +18,7 @@
     :values_in_filter_not_exists
     :subquery_in_filter_not_exists
     :cmp_langString
+    :update_dirtyRead
     ) .
 
 :describe rdf:type mf:QueryEvaluationTest ;
@@ -71,3 +73,8 @@
     mf:name "rdf:langString with the same language are comparable" ;
     mf:action [ qt:query <cmp_langString.rq> ] ;
     mf:result <cmp_langString.srx> .
+
+:update_dirty_read rdf:type mf:UpdateEvaluationTest ;
+    mf:name "An update operation should not be able to read its own writes" ;
+    mf:action [ ut:request <update_dirtyRead.ru> ] ;
+    mf:result [ ut:data <update_dirty_read_result.ttl> ] .

testsuite/oxigraph-tests/sparql/update_dirty_read.ru

@@ -0,0 +1,3 @@
+PREFIX ex: <http://example.com/>
+INSERT DATA { ex:s ex:p 1 . ex:s ex:p 5 };
+INSERT { ex:s ex:p ?v } WHERE { VALUES ?o { 1 2 5 6 } FILTER EXISTS { ?s ex:p ?o } BIND(?o + 1 AS ?v) }

testsuite/oxigraph-tests/sparql/update_dirty_read_result.ttl

@@ -0,0 +1,3 @@
+@prefix ex: <http://example.com/> .
+
+ex:s ex:p 1 , 2 , 5 , 6 .