add test for editor saga

package.json

@@ -73,6 +73,7 @@
         "eslint-plugin-import": "^2.20.2",
         "eslint-plugin-prettier": "^3.1.2",
         "eslint-plugin-react": "^7.20.0",
+        "jest-mock-extended": "^1.0.8",
         "prettier": "^2.0.4"
     }
 }

src/sagas/editor.test.ts

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2020 The Pybricks Authors
+
+import { Ace } from 'ace-builds';
+import { mock } from 'jest-mock-extended';
+import { AsyncSaga } from '../../test';
+import { reloadProgram } from '../actions/editor';
+import editor from './editor';
+
+test('reloadProgram', async () => {
+    const saga = new AsyncSaga(editor);
+
+    const mockEditor = mock<Ace.EditSession>();
+
+    saga.setState({ editor: { current: mockEditor } });
+    saga.put(reloadProgram());
+
+    expect(mockEditor.setValue).toHaveBeenCalled();
+
+    await saga.end();
+});

test/index.ts

@@ -3,21 +3,25 @@
 
 import { END, MulticastChannel, Saga, Task, runSaga, stdChannel } from 'redux-saga';
 import { Action } from '../src/actions';
+import { RootState } from '../src/reducers';
 
 export class AsyncSaga {
+    private channel: MulticastChannel<Action>;
     private dispatches: (Action | END)[];
     private takers: { put: (action: Action | END) => void }[];
-    private channel: MulticastChannel<Action>;
+    private state: Partial<RootState>;
     private task: Task;
 
     public constructor(saga: Saga) {
+        this.channel = stdChannel();
         this.dispatches = [];
         this.takers = [];
-        this.channel = stdChannel();
+        this.state = {};
         this.task = runSaga(
             {
                 channel: this.channel,
                 dispatch: this.dispatch.bind(this),
+                getState: () => this.state,
                 onError: (e) => fail(e),
             },
             saga,
@@ -56,6 +60,10 @@ export class AsyncSaga {
         return Promise.resolve(next);
     }
 
+    public setState(state: Partial<RootState>): void {
+        this.state = state;
+    }
+
     public async end(): Promise<void> {
         this.task.cancel();
         await this.task.toPromise();

yarn.lock

@@ -6565,6 +6565,13 @@ jest-message-util@^24.9.0:
     slash "^2.0.0"
     stack-utils "^1.0.1"
 
+jest-mock-extended@^1.0.8:
+  version "1.0.8"
+  resolved "https://registry.yarnpkg.com/jest-mock-extended/-/jest-mock-extended-1.0.8.tgz#af6cccf78c7ef0c9a0b5fbae4e2625a792f0d6b8"
+  integrity sha512-lwRgbnngx6Woh0OOapes3uJQzngCj69OIhKnXYybEWwE0O1w7UyBJwLciHH6D/MCedogA90qxhEkEANrA20Sfw==
+  dependencies:
+    ts-essentials "^4.0.0"
+
 jest-mock@^24.0.0, jest-mock@^24.9.0:
   version "24.9.0"
   resolved "https://registry.yarnpkg.com/jest-mock/-/jest-mock-24.9.0.tgz#c22835541ee379b908673ad51087a2185c13f1c6"
@@ -11200,6 +11207,11 @@ trim-newlines@^1.0.0:
   dependencies:
     glob "^7.1.2"
 
+ts-essentials@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-4.0.0.tgz#506c42b270bbd0465574b90416533175b09205ab"
+  integrity sha512-uQJX+SRY9mtbKU+g9kl5Fi7AEMofPCvHfJkQlaygpPmHPZrtgaBqbWFOYyiA47RhnSwwnXdepUJrgqUYxoUyhQ==
+
 ts-pnp@1.1.6:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/ts-pnp/-/ts-pnp-1.1.6.tgz#389a24396d425a0d3162e96d2b4638900fdc289a"