Test ability to store an RDF document with named graphs (quads) in it (#101)

* Add fixture from solid-contrib/test-suite#158 (comment)
* Fix fixture name
* Add new test in manifest as unreviewed
* Add requirement for named graphs support in JSON-LD and TTL

---------

Co-authored-by: Pete Edwards <edwardsph@users.noreply.github.com>

Author: michielbdejong

protocol/content-negotiation/content-negotiation-named-graphs.feature

@@ -0,0 +1,23 @@
+Feature: RDF documents containing named graphs can be stored and retrieved
+
+  Background: Create a JSON-LD resource with a named graph
+    * def testContainer = rootTestContainer.reserveContainer()
+    * def withNamedGraphsJson = karate.readAsString('../fixtures/with-named-graphs.json')
+    * def resource = testContainer.createResource('.json', withNamedGraphsJson, 'application/ld+json');
+    * def expected = parse(withNamedGraphsJson, 'application/ld+json')
+    * configure headers = clients.alice.getAuthHeaders('GET', resource.url)
+    * url resource.url
+
+  Scenario: Alice can GET the JSON-LD with named graph as JSON-LD
+    Given header Accept = 'application/ld+json'
+    When method GET
+    Then status 200
+    And match header Content-Type contains 'application/ld+json'
+    And assert parse(response, 'application/ld+json', resource.url).contains(expected)
+
+  Scenario: Alice can GET the JSON-LD with named graph as TTL
+    Given header Accept = 'text/turtle'
+    When method GET
+    Then status 200
+    And match header Content-Type contains 'text/turtle'
+    And assert parse(response, 'text/turtle', resource.url).contains(expected)

protocol/fixtures/with-named-graphs.json

@@ -0,0 +1,9 @@
+{
+  "@context": { "ex": "http://example.org/ns/" },
+  "@id": "ex:test",
+  "@type": "ex:Graph",
+  "@graph": {
+    "@id": "ex:naughty",
+    "@type": "ex:Trial"
+  }
+}

protocol/solid-protocol-test-manifest.ttl

@@ -60,6 +60,13 @@ manifest:content-negotiation-jsonld
   spec:testScript
     <https://github.com/solid-contrib/specification-tests/blob/main/protocol/content-negotiation/content-negotiation-jsonld.feature> .
 
+manifest:content-negotiation-named-graphs
+  a td:TestCase ;
+  spec:requirementReference sopr:server-representation-turtle-jsonld ;
+  td:reviewStatus td:unreviewed ;
+  spec:testScript
+    <https://github.com/solid-contrib/specification-tests/blob/main/protocol/content-negotiation/content-negotiation-named-graphs.feature> .
+
 manifest:uri-assignment
   a td:TestCase ;
   spec:requirementReference sopr:server-put-patch-uri-assignment ;