chore: improve generic data provider unit test

libs/react-helpers/src/lib/generic-data-provider.spec.ts

@@ -19,7 +19,10 @@ import type {
   OperationVariables,
   ApolloQueryResult,
   QueryOptions,
+  ApolloError,
 } from '@apollo/client';
+import { GraphQLError } from 'graphql';
+
 import type { Subscription, Observable } from 'zen-observable-ts';
 
 type Item = {
@@ -58,12 +61,16 @@ const query: Query<QueryData> = {
 };
 const subscriptionQuery: Query<SubscriptionData> = query;
 
+const getData = jest.fn((r: QueryData | null) => r?.data || null);
+
+const getDelta = jest.fn((r: SubscriptionData) => r.data);
+
 const subscribe = makeDataProvider<QueryData, Data, SubscriptionData, Delta>({
   query,
   subscriptionQuery,
   update,
-  getData: (r) => r?.data || null,
-  getDelta: (r) => r.data,
+  getData,
+  getDelta,
 });
 
 const combineData = jest.fn<
@@ -91,8 +98,8 @@ const paginatedSubscribe = makeDataProvider<
   query,
   subscriptionQuery,
   update,
-  getData: (r) => r?.data || null,
-  getDelta: (r) => r.data,
+  getData,
+  getDelta,
   pagination: {
     first,
     append: defaultAppend,
@@ -186,9 +193,20 @@ const clearPendingQueries = () => {
 };
 
 describe('data provider', () => {
+  beforeEach(() => {
+    clearPendingQueries();
+    callback.mockClear();
+    getData.mockClear();
+    clientQuery.mockClear();
+    clientSubscribeUnsubscribe.mockClear();
+    clientSubscribeSubscribe.mockClear();
+  });
   it('memoize instance and unsubscribe if no subscribers', () => {
-    const subscription1 = subscribe(jest.fn(), client);
-    const subscription2 = subscribe(jest.fn(), client);
+    const variables = { var: 'val' };
+    const subscription1 = subscribe(jest.fn(), client, variables);
+    const subscription2 = subscribe(jest.fn(), client, { ...variables });
+    // const subscription1 = subscribe(jest.fn(), client);
+    // const subscription2 = subscribe(jest.fn(), client);
     expect(clientSubscribeSubscribe.mock.calls.length).toEqual(1);
     subscription1.unsubscribe();
     expect(clientSubscribeUnsubscribe.mock.calls.length).toEqual(0);
@@ -197,7 +215,6 @@ describe('data provider', () => {
   });
 
   it('calls callback before and after initial fetch', async () => {
-    callback.mockClear();
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
     expect(callback.mock.calls.length).toBe(1);
@@ -210,6 +227,49 @@ describe('data provider', () => {
     subscription.unsubscribe();
   });
 
+  it('calls callback on error', async () => {
+    const subscription = subscribe(callback, client);
+    expect(callback.mock.calls.length).toBe(1);
+    expect(callback.mock.calls[0][0].data).toBe(null);
+    expect(callback.mock.calls[0][0].loading).toBe(true);
+    const error = new Error('Rejected by unit test');
+    await rejectQuery(error);
+    expect(getData).not.toBeCalled();
+    expect(callback.mock.calls.length).toBe(2);
+    expect(callback.mock.calls[1][0].error).toEqual(error);
+    expect(callback.mock.calls[1][0].loading).toBe(false);
+    subscription.unsubscribe();
+  });
+
+  it('calls successful callback on NotFound error on party path', async () => {
+    const subscription = subscribe(callback, client);
+    expect(callback.mock.calls.length).toBe(1);
+    expect(callback.mock.calls[0][0].data).toBe(null);
+    expect(callback.mock.calls[0][0].loading).toBe(true);
+    const error = new Error() as ApolloError;
+    const graphQLError = new GraphQLError(
+      '',
+      undefined,
+      undefined,
+      undefined,
+      ['party'],
+      undefined,
+      {
+        type: 'NotFound',
+      }
+    );
+    error.graphQLErrors = [graphQLError];
+    const data: Data = [];
+    getData.mockReturnValueOnce(data);
+    await rejectQuery(error);
+    expect(getData).toHaveBeenCalledWith(null, undefined);
+    expect(callback.mock.calls.length).toBe(2);
+    expect(callback.mock.calls[1][0].data).toEqual(data);
+    expect(callback.mock.calls[1][0].error).toEqual(undefined);
+    expect(callback.mock.calls[1][0].loading).toBe(false);
+    subscription.unsubscribe();
+  });
+
   it('calls update and callback on each update', async () => {
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
@@ -228,8 +288,7 @@ describe('data provider', () => {
     subscription.unsubscribe();
   });
 
-  it("don't calls callback on update if data doesn't", async () => {
-    callback.mockClear();
+  it("don't calls callback on update if data doesn't change", async () => {
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
     await resolveQuery({ data });
@@ -247,10 +306,6 @@ describe('data provider', () => {
   });
 
   it('refetch data on reload', async () => {
-    clearPendingQueries();
-    clientQuery.mockClear();
-    clientSubscribeUnsubscribe.mockClear();
-    clientSubscribeSubscribe.mockClear();
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
     await resolveQuery({ data });
@@ -263,9 +318,6 @@ describe('data provider', () => {
   });
 
   it('refetch data and restart subscription on reload with force', async () => {
-    clientQuery.mockClear();
-    clientSubscribeUnsubscribe.mockClear();
-    clientSubscribeSubscribe.mockClear();
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
     await resolveQuery({ data });
@@ -278,7 +330,6 @@ describe('data provider', () => {
   });
 
   it('calls callback on flush', async () => {
-    callback.mockClear();
     const data: Item[] = [];
     const subscription = subscribe(callback, client);
     await resolveQuery({ data });
@@ -289,8 +340,6 @@ describe('data provider', () => {
   });
 
   it('fills data with nulls if pagination is enabled', async () => {
-    callback.mockClear();
-    clearPendingQueries();
     const totalCount = 1000;
     const data: Item[] = new Array(first).fill(null).map((v, i) => ({
       cursor: i.toString(),
@@ -311,7 +360,6 @@ describe('data provider', () => {
   });
 
   it('loads requested data blocks and inserts data with total count', async () => {
-    callback.mockClear();
     const totalCount = 1000;
     const subscription = paginatedSubscribe(callback, client);
     await resolveQuery({
@@ -436,7 +484,6 @@ describe('data provider', () => {
   });
 
   it('loads requested data blocks and inserts data without totalCount', async () => {
-    callback.mockClear();
     const totalCount = undefined;
     const subscription = paginatedSubscribe(callback, client);
     await resolveQuery({

libs/react-helpers/src/lib/generic-data-provider.ts

@@ -407,6 +407,15 @@ function makeDataProviderInternal<
     }
   };
 
+  const onError = (e: Error) => {
+    error = e;
+    if (subscription) {
+      subscription.unsubscribe();
+      subscription = undefined;
+    }
+    notifyAll();
+  };
+
   const initialize = async () => {
     if (subscription) {
       if (resetTimer) {
@@ -427,14 +436,7 @@ function makeDataProviderInternal<
           variables,
           fetchPolicy,
         })
-        .subscribe(onNext, (e) => {
-          error = e as Error;
-          if (subscription) {
-            subscription.unsubscribe();
-            subscription = undefined;
-          }
-          notifyAll();
-        });
+        .subscribe(onNext, onError);
     }
     await initialFetch();
   };