chore: Add test coverage for total count edge case

Author: igdianov

schema/src/main/java/com/introproventures/graphql/jpa/query/schema/impl/ResultStreamWrapper.java

@@ -63,6 +63,8 @@ public Object invoke(Object proxy, Method method, Object[] args) throws Throwabl
                 return System.identityHashCode(proxy);
             } else if ("spliterator".equals(method.getName())) {
                 return stream.spliterator();
+            } else if ("isEmpty".equals(method.getName())) {
+                return size == 0;
             }
             throw new UnsupportedOperationException(method + " is not supported");
         }

schema/src/test/java/com/introproventures/graphql/jpa/query/support/StarwarsQueryExecutorTestsSupport.java

@@ -392,6 +392,20 @@ public void queryWhereRoot() {
         assertThat(result.toString()).isEqualTo(expected);
     }
 
+    @Test
+    public void queryWhereRoot2() {
+        //given:
+        String query = "query { Humans( page: { start: 4, limit: 2 }) { pages, total, select { name } } }";
+
+        String expected = "{Humans={pages=3, total=5, select=[]}}";
+
+        //when:
+        Object result = executor.execute(query).getData();
+
+        //then:
+        assertThat(result.toString()).isEqualTo(expected);
+    }
+
     @Test
     public void queryWhereRootPagedWithVariables() {
         //given:
@@ -427,6 +441,20 @@ public void queryPaginationWithoutRecords() {
         assertThat(result.toString()).isEqualTo(expected);
     }
 
+    @Test
+    public void queryPaginationWithoutRecords2() {
+        //given:
+        String query = "query { Humans ( page: { start: 4, limit: 2 }) { pages, total } }";
+
+        String expected = "{Humans={pages=3, total=5}}";
+
+        //when:
+        Object result = executor.execute(query).getData();
+
+        //then:
+        assertThat(result.toString()).isEqualTo(expected);
+    }
+
     @Test
     public void queryOrderByFields() {
         //given: