Add blank node system test.

Closes #34

test/assets/http/System-test-blank-nodes_2374737181/Alice-s-friends-with-one-expression_87134690/recording.har

@@ -0,0 +1,141 @@
+{
+  "log": {
+    "_recordingName": "System test: blank nodes/Alice's friends with one expression",
+    "creator": {
+      "comment": "persister:fs",
+      "name": "Polly.JS",
+      "version": "4.1.0"
+    },
+    "entries": [
+      {
+        "_id": "e0158368a4527e1173c6c7e213eec436",
+        "_order": 0,
+        "cache": {},
+        "request": {
+          "bodySize": 0,
+          "cookies": [],
+          "headers": [
+            {
+              "_fromType": "array",
+              "name": "accept",
+              "value": "application/n-quads,application/trig;q=0.95,application/ld+json;q=0.9,application/n-triples;q=0.8,text/turtle;q=0.5,application/rdf+xml;q=0.5,application/json;q=0.45,text/n3;q=0.35,application/xml;q=0.3,text/xml;q=0.3,image/svg+xml;q=0.3,text/html;q=0.2,application/xhtml+xml;q=0.18"
+            },
+            {
+              "_fromType": "array",
+              "name": "accept-encoding",
+              "value": "gzip,deflate"
+            },
+            {
+              "_fromType": "array",
+              "name": "user-agent",
+              "value": "node-fetch/1.0 (+https://github.com/bitinn/node-fetch)"
+            },
+            {
+              "_fromType": "array",
+              "name": "connection",
+              "value": "close"
+            },
+            {
+              "name": "host",
+              "value": "drive.verborgh.org"
+            }
+          ],
+          "headersSize": 502,
+          "httpVersion": "HTTP/1.1",
+          "method": "GET",
+          "queryString": [],
+          "url": "https://drive.verborgh.org/public/2019/blanks.ttl"
+        },
+        "response": {
+          "bodySize": 334,
+          "content": {
+            "mimeType": "text/turtle",
+            "size": 334,
+            "text": "[\"1f8b08000000000000037328284a4dcbac5048cb4f4cb352b0c9282929b0d2d7afc8cdc92bd64bcecfd50789eb1be819eadbe97171d9283be66426a7da4154e725e6a62a28814594acb91460006c52765e7e79b14234b242a7fc242585581d84429806208da2d039b1283f07a81461a111a68d46c85642ac81d869a30cb4c8c80ebb3d0a36ca60d38d80be812a4473a291124806aa08590e22a4a40700ff2c320531010000\"]"
+          },
+          "cookies": [],
+          "headers": [
+            {
+              "name": "date",
+              "value": "Sat, 25 Apr 2020 21:45:20 GMT"
+            },
+            {
+              "name": "content-type",
+              "value": "text/turtle"
+            },
+            {
+              "name": "transfer-encoding",
+              "value": "chunked"
+            },
+            {
+              "name": "connection",
+              "value": "close"
+            },
+            {
+              "name": "vary",
+              "value": "Accept-Encoding, Accept, Authorization, Origin"
+            },
+            {
+              "name": "x-powered-by",
+              "value": "solid-server"
+            },
+            {
+              "name": "access-control-allow-credentials",
+              "value": "true"
+            },
+            {
+              "name": "access-control-expose-headers",
+              "value": "Authorization, User, Location, Link, Vary, Last-Modified, ETag, Accept-Patch, Accept-Post, Updates-Via, Allow, WAC-Allow, Content-Length, WWW-Authenticate"
+            },
+            {
+              "name": "allow",
+              "value": "OPTIONS, HEAD, GET, PATCH, POST, PUT, DELETE"
+            },
+            {
+              "name": "link",
+              "value": "<blanks.ttl.acl>; rel=\"acl\", <blanks.ttl.meta>; rel=\"describedBy\", <http://www.w3.org/ns/ldp#Resource>; rel=\"type\""
+            },
+            {
+              "name": "wac-allow",
+              "value": "user=\"read\",public=\"read\""
+            },
+            {
+              "name": "ms-author-via",
+              "value": "SPARQL"
+            },
+            {
+              "name": "updates-via",
+              "value": "wss://drive.verborgh.org"
+            },
+            {
+              "name": "strict-transport-security",
+              "value": "max-age=15768000"
+            },
+            {
+              "name": "content-encoding",
+              "value": "gzip"
+            }
+          ],
+          "headersSize": 766,
+          "httpVersion": "HTTP/1.1",
+          "redirectURL": "",
+          "status": 200,
+          "statusText": "OK"
+        },
+        "startedDateTime": "2020-04-25T21:45:20.680Z",
+        "time": 226,
+        "timings": {
+          "blocked": -1,
+          "connect": -1,
+          "dns": -1,
+          "receive": 0,
+          "send": 0,
+          "ssl": -1,
+          "wait": 226
+        }
+      }
+    ],
+    "pages": [],
+    "version": "1.2"
+  }
+}

test/system/blanks-test.js

@@ -0,0 +1,28 @@
+import data from '../../src/exports/comunica.js';
+
+jest.unmock('solid-auth-client');
+import { mockHttp } from '../util';
+
+const alice = 'https://drive.verborgh.org/public/2019/blanks.ttl#Alice';
+
+describe('System test: blank nodes', () => {
+  mockHttp();
+
+  test('Alice\'s friends with one expression', async () => {
+    const names = [];
+    for await (const name of data[alice].friends.name)
+      names.push(`${name}`);
+    expect(names).toHaveLength(2);
+    expect(names).toContain('Bob');
+    expect(names).toContain('Carol');
+  });
+
+  test('Alice\'s friends with two expressions', async () => {
+    const names = [];
+    for await (const friend of data[alice].friends)
+      names.push(`${await friend.name}`);
+    expect(names).toHaveLength(2);
+    expect(names).toContain('Bob');
+    expect(names).toContain('Carol');
+  });
+});