Additional async tests

Author: acoburn

acp/src/test/java/com/inrupt/client/acp/AccessControlResourceTest.java

@@ -335,4 +335,23 @@ void expandAcr4Sync() {
             assertEquals(20, acr.size());
         }
     }
+
+    @Test
+    void expandAcr4Async() {
+        final var uri = mockHttpServer.acr4();
+        final var asyncClient = SolidClient.getClient();
+        asyncClient.read(uri, AccessControlResource.class).thenAccept(res -> {
+            try (final var acr = res) {
+                assertEquals(2, acr.accessControl().size());
+                assertEquals(3, acr.memberAccessControl().size());
+
+                // Check dataset size
+                assertEquals(20, acr.size());
+
+                final var expanded = acr.expand(asyncClient);
+                assertEquals(22, expanded.size());
+                assertEquals(20, acr.size());
+            }
+        }).toCompletableFuture().join();
+    }
 }