add tests

Author: yaacovCR

src/execution/__tests__/stream-test.js

@@ -71,6 +71,7 @@ const query = new GraphQLObjectType({
       async *resolve() {
         yield friends[0].name;
         yield {};
+        yield friends[2].name;
       },
     },
     asyncIterableListDelayed: {
@@ -464,6 +465,42 @@ describe('Execute: stream directive', () => {
       },
     ]);
   });
+  it('Handles errors thrown by completeValue before initialCount is reached', async () => {
+    const document = parse(`
+      query { 
+        asyncIterableInvalid @stream(initialCount: 2)
+      }
+    `);
+    const result = await complete(document);
+    expect(result).to.deep.equal([
+      {
+        data: {
+          asyncIterableInvalid: ['Luke', null],
+        },
+        errors: [
+          {
+            message: 'String cannot represent value: {}',
+            locations: [
+              {
+                line: 3,
+                column: 9,
+              },
+            ],
+            path: ['asyncIterableInvalid', 1],
+          },
+        ],
+        hasNext: true,
+      },
+      {
+        data: 'Leia',
+        path: ['asyncIterableInvalid', 2],
+        hasNext: true,
+      },
+      {
+        hasNext: false,
+      },
+    ]);
+  });
   it('Handles errors thrown by completeValue after initialCount is reached', async () => {
     const document = parse(`
       query { 
@@ -495,6 +532,11 @@ describe('Execute: stream directive', () => {
         ],
         hasNext: true,
       },
+      {
+        data: 'Leia',
+        path: ['asyncIterableInvalid', 2],
+        hasNext: true,
+      },
       {
         hasNext: false,
       },