add tests for lwp3-bootloader reducers

src/lwp3-bootloader/actions.ts

@@ -48,6 +48,10 @@ export enum BootloaderConnectionActionType {
      * The connection has been closed.
      */
     DidDisconnect = 'bootloader.action.connection.did.disconnect',
+    /**
+     * Disconnecting failed.
+     */
+    DidFailToDisconnect = 'bootloader.action.connection.did.failToDisconnect',
 }
 
 export type BootloaderConnectionConnectAction = Action<BootloaderConnectionActionType.Connect>;
@@ -184,6 +188,12 @@ export function didDisconnect(): BootloaderConnectionDidDisconnectAction {
     return { type: BootloaderConnectionActionType.DidDisconnect };
 }
 
+export type BootloaderConnectionDidFailToDisconnectAction = Action<BootloaderConnectionActionType.DidFailToDisconnect>;
+
+export function didFailToDisconnect(): BootloaderConnectionDidFailToDisconnectAction {
+    return { type: BootloaderConnectionActionType.DidFailToDisconnect };
+}
+
 /**
  * Common type for all bootloader connection actions.
  */
@@ -196,7 +206,9 @@ export type BootloaderConnectionAction =
     | BootloaderConnectionDidSendAction
     | BootloaderConnectionDidFailToSendAction
     | BootloaderConnectionDidReceiveAction
-    | BootloaderConnectionDidDisconnectAction;
+    | BootloaderConnectionDisconnectAction
+    | BootloaderConnectionDidDisconnectAction
+    | BootloaderConnectionDidFailToDisconnectAction;
 
 /**
  * Bootloader request actions for sending commands over the connection.

src/lwp3-bootloader/reducers.test.ts

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2021 The Pybricks Authors
+
+import { Action } from '../actions';
+import {
+    BootloaderConnectionFailureReason,
+    connect,
+    didConnect,
+    didDisconnect,
+    didFailToConnect,
+    didFailToDisconnect,
+    disconnect,
+    disconnectRequest,
+    rebootRequest,
+} from './actions';
+import reducers, { BootloaderConnectionState } from './reducers';
+
+type State = ReturnType<typeof reducers>;
+
+test('initial state', () => {
+    expect(reducers(undefined, {} as Action)).toMatchInlineSnapshot(`
+        Object {
+          "connection": "bootloader.connection.disconnected",
+        }
+    `);
+});
+
+test('connection', () => {
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Disconnected } as State,
+            connect(),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Connecting);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Connecting } as State,
+            didConnect(),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Connected);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Connecting } as State,
+            didFailToConnect(BootloaderConnectionFailureReason.Canceled),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Disconnected);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Connected } as State,
+            disconnect(),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Disconnecting);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Disconnecting } as State,
+            didDisconnect(),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Disconnected);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Disconnecting } as State,
+            didFailToDisconnect(),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Connected);
+
+    // certain commands are also know to trigger disconnect
+
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Connected } as State,
+            rebootRequest(0),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Disconnecting);
+    expect(
+        reducers(
+            { connection: BootloaderConnectionState.Connected } as State,
+            disconnectRequest(0),
+        ).connection,
+    ).toBe(BootloaderConnectionState.Disconnecting);
+});

src/lwp3-bootloader/reducers.ts

@@ -35,7 +35,9 @@ const connection: Reducer<BootloaderConnectionState, Action> = (
         case BootloaderConnectionActionType.Connect:
             return BootloaderConnectionState.Connecting;
         case BootloaderConnectionActionType.DidConnect:
+        case BootloaderConnectionActionType.DidFailToDisconnect:
             return BootloaderConnectionState.Connected;
+        case BootloaderConnectionActionType.Disconnect:
         case BootloaderRequestActionType.Reboot:
         case BootloaderRequestActionType.Disconnect:
             return BootloaderConnectionState.Disconnecting;