Updated SPARQL, added unit test to remove objects

sparql/remove_objects.sparql

@@ -1,7 +1,11 @@
+PREFIX schema: <http://schema.org/>
+PREFIX schemaHttps: <https://schema.org/>
+
 DELETE {
-  ?subject ?predicate ?object .
+  ?s ?p ?o .
 }
 WHERE {
-  ?subject ?predicate ?object .
-  ?subject a <http://schema.org/SiteNavigationElement> .
+  ?s ?p ?o .
+  ?s a ?type .
+  VALUES ?type { schema:SiteNavigationElement schemaHttps:SiteNavigationElement }
 }

tests/fixtures/test_remove_object.jsonld

@@ -0,0 +1,46 @@
+{
+    "@context": "http://schema.org",
+    "@graph": [
+        {
+            "@id": "https://example.com/temporary/unique-id-1",
+            "@type": [
+                "https://schema.org/SiteNavigationElement"
+            ],
+            "http://www.w3.org/ns/prov#wasDerivedFrom": [
+                {
+                    "@id": "https://example.com/source-page-1"
+                }
+            ]
+        },
+        {
+            "@id": "https://example.com/temporary/unique-id-2",
+            "@type": [
+                "http://schema.org/SiteNavigationElement"
+            ],
+            "http://schema.org/name": [
+                {
+                    "@value": "Example Name 1"
+                },
+                {
+                    "@value": "Example Name 2"
+                }
+            ],
+            "http://schema.org/url": [
+                {
+                    "@id": "https://example.com/page-1"
+                },
+                {
+                    "@id": "https://example.com/page-2"
+                },
+                {
+                    "@id": "https://example.com/login-page"
+                }
+            ],
+            "http://www.w3.org/ns.prov#wasDerivedFrom": [
+                {
+                    "@id": "https://example.com/source-page-1"
+                }
+            ]
+        }
+    ]
+}

tests/remove_object_test.rb

@@ -0,0 +1,21 @@
+require 'minitest/autorun'
+require 'linkeddata'
+
+class RemoveObjectTest < Minitest::Test
+  def setup
+    @remove_object_sparql_file = "./sparql/remove_objects.sparql"
+  end
+
+  def test_remove_object
+    sparql = SPARQL.parse(File.read(@remove_object_sparql_file), update: true)
+    graph = RDF::Graph.load("./tests/fixtures/test_remove_object.jsonld")
+
+    # puts "before: #{graph.dump(:jsonld)}"
+    graph.query(sparql)
+
+    # puts "after: #{graph.dump(:jsonld)}"
+    assert_equal(0, graph.count, "The graph should have no objects after the SPARQL update.")
+  end
+
+
+end