add new tests

Author: yaacovCR

src/execution/__tests__/defer-test.ts

@@ -476,6 +476,40 @@ describe('Execute: defer directive', () => {
     });
   });
 
+  it('Emits children of empty defer fragments', async () => {
+    const document = parse(`
+      query HeroNameQuery {
+        hero {
+          ... @defer {
+            ... @defer {
+              name
+            }
+          }
+        }
+      }
+    `);
+    const result = await complete(document);
+    expectJSON(result).toDeepEqual([
+      {
+        data: {
+          hero: {},
+        },
+        pending: [{ id: '0', path: ['hero'] }],
+        hasNext: true,
+      },
+      {
+        pending: [{ id: '1', path: ['hero'] }],
+        completed: [{ id: '0' }],
+        hasNext: true,
+      },
+      {
+        incremental: [{ data: { name: 'Luke' }, id: '1' }],
+        completed: [{ id: '1' }],
+        hasNext: false,
+      },
+    ]);
+  });
+
   it('Can separately emit defer fragments with different labels with varying fields', async () => {
     const document = parse(`
       query HeroNameQuery {
@@ -760,13 +794,38 @@ describe('Execute: defer directive', () => {
         ],
         hasNext: true,
       },
+      // TODO: these pending notifications and the subsequent payloads are all empty
+      // fixed by https://github.com/graphql/graphql-js/pull/3993
       {
+        pending: [
+          { id: '3', path: ['hero', 'friends', 0] },
+          { id: '4', path: ['hero', 'friends', 1] },
+          { id: '5', path: ['hero', 'friends', 2] },
+        ],
         incremental: [
           { data: { id: '2', name: 'Han' }, id: '0' },
           { data: { id: '3', name: 'Leia' }, id: '1' },
           { data: { id: '4', name: 'C-3PO' }, id: '2' },
         ],
         completed: [{ id: '0' }, { id: '1' }, { id: '2' }],
+        hasNext: true,
+      },
+      {
+        pending: [
+          { id: '6', path: ['hero', 'friends', 0] },
+          { id: '7', path: ['hero', 'friends', 1] },
+          { id: '8', path: ['hero', 'friends', 2] },
+        ],
+        completed: [{ id: '3' }, { id: '4' }, { id: '5' }],
+        hasNext: true,
+      },
+      {
+        pending: [
+          { id: '9', path: ['hero', 'friends', 0] },
+          { id: '10', path: ['hero', 'friends', 1] },
+          { id: '11', path: ['hero', 'friends', 2] },
+        ],
+        completed: [{ id: '6' }, { id: '7' }, { id: '8' }],
         hasNext: false,
       },
     ]);