fix: incorrect @id expansion

Author: ndr-brt

.gitignore

@@ -14,5 +14,6 @@ coverage
 dist
 node_modules
 npm-debug.log
+package-lock.json
 tests/webidl/*-new
 v8.log

lib/url.js

@@ -109,6 +109,8 @@ api.prependBase = (base, iri) => {
         path = path.substr(0, path.lastIndexOf('/') + 1);
         if((path.length > 0 || base.authority) && path.substr(-1) !== '/') {
           path += '/';
+        } else if (rel.protocol) {
+          path += rel.protocol;
         }
         path += rel.path;
 

tests/misc.js

@@ -1491,6 +1491,7 @@ _:b0 <ex:p> "v" .
         testSafe: true
       });
     });
+
   });
 
   describe('values', () => {
@@ -2816,6 +2817,37 @@ _:b0 <ex:p> "[null]"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#JSON> .
       });
     });
 
+    it('should be called on relative IRI for id term [4]', async () => {
+      const input =
+{
+  "@id": "34:relativeiri",
+  "urn:test": "value"
+}
+;
+      const expected =
+[
+  {
+    "@id": "34:relativeiri",
+    "urn:test": [
+      {
+        "@value": "value"
+      }
+    ]
+  }
+]
+;
+
+      await _test({
+        type: 'expand',
+        input,
+        expected,
+        eventCodeLog: [
+          'relative @id reference'
+        ],
+        testNotSafe: true
+      });
+    });
+
     it('should be called on relative IRI for id term (nested)', async () => {
       const input =
 {