[Discover] Fix keeping error state after invalid KQL query (#109514) (#109643)

Co-authored-by: Matthias Wilhelm <matthias.wilhelm@elastic.co>

src/plugins/discover/public/application/apps/main/services/use_saved_search_messages.test.ts

@@ -0,0 +1,79 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+import {
+  sendCompleteMsg,
+  sendErrorMsg,
+  sendLoadingMsg,
+  sendPartialMsg,
+} from './use_saved_search_messages';
+import { FetchStatus } from '../../../types';
+import { BehaviorSubject } from 'rxjs';
+import { DataMainMsg } from './use_saved_search';
+
+describe('test useSavedSearch message generators', () => {
+  test('sendCompleteMsg', async (done) => {
+    const main$ = new BehaviorSubject<DataMainMsg>({ fetchStatus: FetchStatus.LOADING });
+    main$.subscribe((value) => {
+      if (value.fetchStatus !== FetchStatus.LOADING) {
+        expect(value.fetchStatus).toBe(FetchStatus.COMPLETE);
+        expect(value.foundDocuments).toBe(true);
+        expect(value.error).toBe(undefined);
+        done();
+      }
+    });
+    sendCompleteMsg(main$, true);
+  });
+  test('sendPartialMessage', async (done) => {
+    const main$ = new BehaviorSubject<DataMainMsg>({ fetchStatus: FetchStatus.LOADING });
+    main$.subscribe((value) => {
+      if (value.fetchStatus !== FetchStatus.LOADING) {
+        expect(value.fetchStatus).toBe(FetchStatus.PARTIAL);
+        done();
+      }
+    });
+    sendPartialMsg(main$);
+  });
+  test('sendLoadingMsg', async (done) => {
+    const main$ = new BehaviorSubject<DataMainMsg>({ fetchStatus: FetchStatus.COMPLETE });
+    main$.subscribe((value) => {
+      if (value.fetchStatus !== FetchStatus.COMPLETE) {
+        expect(value.fetchStatus).toBe(FetchStatus.LOADING);
+        done();
+      }
+    });
+    sendLoadingMsg(main$);
+  });
+  test('sendErrorMsg', async (done) => {
+    const main$ = new BehaviorSubject<DataMainMsg>({ fetchStatus: FetchStatus.PARTIAL });
+    main$.subscribe((value) => {
+      if (value.fetchStatus === FetchStatus.ERROR) {
+        expect(value.fetchStatus).toBe(FetchStatus.ERROR);
+        expect(value.error).toBeInstanceOf(Error);
+        done();
+      }
+    });
+    sendErrorMsg(main$, new Error('Pls help!'));
+  });
+
+  test('sendCompleteMsg cleaning error state message', async (done) => {
+    const initialState = {
+      fetchStatus: FetchStatus.ERROR,
+      error: new Error('Oh noes!'),
+    };
+    const main$ = new BehaviorSubject<DataMainMsg>(initialState);
+    main$.subscribe((value) => {
+      if (value.fetchStatus === FetchStatus.COMPLETE) {
+        const newState = { ...initialState, ...value };
+        expect(newState.fetchStatus).toBe(FetchStatus.COMPLETE);
+        expect(newState.error).toBeUndefined();
+        done();
+      }
+    });
+    sendCompleteMsg(main$, false);
+  });
+});

src/plugins/discover/public/application/apps/main/services/use_saved_search_messages.ts

@@ -27,6 +27,7 @@ export function sendCompleteMsg(main$: DataMain$, foundDocuments = true) {
   main$.next({
     fetchStatus: FetchStatus.COMPLETE,
     foundDocuments,
+    error: undefined,
   });
 }