Pressing Esc in left pane composer menu should go back

ts/test-node/components/leftPane/LeftPaneArchiveHelper_test.ts

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { assert } from 'chai';
+import * as sinon from 'sinon';
 import { v4 as uuid } from 'uuid';
 import { RowType } from '../../../components/ConversationList';
 import { FindDirection } from '../../../components/leftPane/LeftPaneHelper';
@@ -15,6 +16,15 @@ describe('LeftPaneArchiveHelper', () => {
     type: 'direct' as const,
   });
 
+  describe('getBackAction', () => {
+    it('returns the "show inbox" action', () => {
+      const showInbox = sinon.fake();
+      const helper = new LeftPaneArchiveHelper({ archivedConversations: [] });
+
+      assert.strictEqual(helper.getBackAction({ showInbox }), showInbox);
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns the number of archived conversations', () => {
       assert.strictEqual(

ts/test-node/components/leftPane/LeftPaneChooseGroupMembersHelper_test.ts

@@ -45,6 +45,18 @@ describe('LeftPaneChooseGroupMembersHelper', () => {
     sinonSandbox.restore();
   });
 
+  describe('getBackAction', () => {
+    it('returns the "show composer" action', () => {
+      const startComposing = sinon.fake();
+      const helper = new LeftPaneChooseGroupMembersHelper(defaults);
+
+      assert.strictEqual(
+        helper.getBackAction({ startComposing }),
+        startComposing
+      );
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns 0 if there are no contacts', () => {
       assert.strictEqual(

ts/test-node/components/leftPane/LeftPaneComposeHelper_test.ts

@@ -35,6 +35,19 @@ describe('LeftPaneComposeHelper', () => {
     sinonSandbox.restore();
   });
 
+  describe('getBackAction', () => {
+    it('returns the "show inbox" action', () => {
+      const showInbox = sinon.fake();
+      const helper = new LeftPaneComposeHelper({
+        composeContacts: [],
+        regionCode: 'US',
+        searchTerm: '',
+      });
+
+      assert.strictEqual(helper.getBackAction({ showInbox }), showInbox);
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns 1 (for the "new group" button) if not searching and there are no contacts', () => {
       assert.strictEqual(

ts/test-node/components/leftPane/LeftPaneInboxHelper_test.ts

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { assert } from 'chai';
+import * as sinon from 'sinon';
 import { v4 as uuid } from 'uuid';
 import { RowType } from '../../../components/ConversationList';
 import { FindDirection } from '../../../components/leftPane/LeftPaneHelper';
@@ -15,6 +16,24 @@ describe('LeftPaneInboxHelper', () => {
     type: 'direct' as const,
   });
 
+  describe('getBackAction', () => {
+    it("returns undefined; you can't go back from the main inbox", () => {
+      const helper = new LeftPaneInboxHelper({
+        conversations: [],
+        pinnedConversations: [],
+        archivedConversations: [],
+      });
+
+      assert.isUndefined(
+        helper.getBackAction({
+          showChooseGroupMembers: sinon.fake(),
+          showInbox: sinon.fake(),
+          startComposing: sinon.fake(),
+        })
+      );
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns 0 if there are no conversations', () => {
       const helper = new LeftPaneInboxHelper({

ts/test-node/components/leftPane/LeftPaneSearchHelper_test.ts

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { assert } from 'chai';
+import * as sinon from 'sinon';
 import { v4 as uuid } from 'uuid';
 import { RowType } from '../../../components/ConversationList';
 
@@ -19,6 +20,25 @@ describe('LeftPaneSearchHelper', () => {
     conversationId: uuid(),
   });
 
+  describe('getBackAction', () => {
+    it('returns undefined; going back is handled elsewhere in the app', () => {
+      const helper = new LeftPaneSearchHelper({
+        conversationResults: { isLoading: false, results: [] },
+        contactResults: { isLoading: false, results: [] },
+        messageResults: { isLoading: false, results: [] },
+        searchTerm: 'foo',
+      });
+
+      assert.isUndefined(
+        helper.getBackAction({
+          showChooseGroupMembers: sinon.fake(),
+          showInbox: sinon.fake(),
+          startComposing: sinon.fake(),
+        })
+      );
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns 0 when there are no search results', () => {
       const helper = new LeftPaneSearchHelper({

ts/test-node/components/leftPane/LeftPaneSetGroupMetadataHelper_test.ts

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { assert } from 'chai';
+import * as sinon from 'sinon';
 import { v4 as uuid } from 'uuid';
 import { RowType } from '../../../components/ConversationList';
 
@@ -14,6 +15,38 @@ describe('LeftPaneSetGroupMetadataHelper', () => {
     type: 'direct' as const,
   });
 
+  describe('getBackAction', () => {
+    it('returns the "show composer" action if a request is not active', () => {
+      const showChooseGroupMembers = sinon.fake();
+      const helper = new LeftPaneSetGroupMetadataHelper({
+        groupAvatar: undefined,
+        groupName: '',
+        hasError: false,
+        isCreating: false,
+        selectedContacts: [],
+      });
+
+      assert.strictEqual(
+        helper.getBackAction({ showChooseGroupMembers }),
+        showChooseGroupMembers
+      );
+    });
+
+    it("returns undefined (i.e., you can't go back) if a request is active", () => {
+      const helper = new LeftPaneSetGroupMetadataHelper({
+        groupAvatar: undefined,
+        groupName: 'Foo Bar',
+        hasError: false,
+        isCreating: true,
+        selectedContacts: [],
+      });
+
+      assert.isUndefined(
+        helper.getBackAction({ showChooseGroupMembers: sinon.fake() })
+      );
+    });
+  });
+
   describe('getRowCount', () => {
     it('returns 0 if there are no contacts', () => {
       assert.strictEqual(