Add "new conversation" composer for direct messages

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

@@ -0,0 +1,199 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import { v4 as uuid } from 'uuid';
+import {
+  FindDirection,
+  ToFindType,
+} from '../../../components/leftPane/LeftPaneHelper';
+
+import { getConversationInDirection } from '../../../components/leftPane/getConversationInDirection';
+
+describe('getConversationInDirection', () => {
+  const fakeConversation = (markedUnread = false) => ({
+    id: uuid(),
+    title: uuid(),
+    type: 'direct' as const,
+    markedUnread,
+  });
+
+  const fakeConversations = [
+    fakeConversation(),
+    fakeConversation(true),
+    fakeConversation(true),
+    fakeConversation(),
+  ];
+
+  describe('searching for any conversation', () => {
+    const up: ToFindType = {
+      direction: FindDirection.Up,
+      unreadOnly: false,
+    };
+    const down: ToFindType = {
+      direction: FindDirection.Down,
+      unreadOnly: false,
+    };
+
+    it('returns undefined if there are no conversations', () => {
+      assert.isUndefined(getConversationInDirection([], up, undefined));
+      assert.isUndefined(getConversationInDirection([], down, undefined));
+    });
+
+    it('if no conversation is selected, returns the last conversation when going up', () => {
+      assert.deepEqual(
+        getConversationInDirection(fakeConversations, up, undefined),
+        { conversationId: fakeConversations[3].id }
+      );
+    });
+
+    it('if no conversation is selected, returns the first conversation when going down', () => {
+      assert.deepEqual(
+        getConversationInDirection(fakeConversations, down, undefined),
+        { conversationId: fakeConversations[0].id }
+      );
+    });
+
+    it('if the first conversation is selected, returns the last conversation when going up', () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          up,
+          fakeConversations[0].id
+        ),
+        { conversationId: fakeConversations[3].id }
+      );
+    });
+
+    it('if the last conversation is selected, returns the first conversation when going down', () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          down,
+          fakeConversations[3].id
+        ),
+        { conversationId: fakeConversations[0].id }
+      );
+    });
+
+    it('goes up one conversation in normal cases', () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          up,
+          fakeConversations[2].id
+        ),
+        { conversationId: fakeConversations[1].id }
+      );
+    });
+
+    it('goes down one conversation in normal cases', () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          down,
+          fakeConversations[0].id
+        ),
+        { conversationId: fakeConversations[1].id }
+      );
+    });
+  });
+
+  describe('searching for unread conversations', () => {
+    const up: ToFindType = {
+      direction: FindDirection.Up,
+      unreadOnly: true,
+    };
+    const down: ToFindType = {
+      direction: FindDirection.Down,
+      unreadOnly: true,
+    };
+
+    const noUnreads = [
+      fakeConversation(),
+      fakeConversation(),
+      fakeConversation(),
+    ];
+
+    it('returns undefined if there are no conversations', () => {
+      assert.isUndefined(getConversationInDirection([], up, undefined));
+      assert.isUndefined(getConversationInDirection([], down, undefined));
+    });
+
+    it('if no conversation is selected, finds the last unread conversation (if it exists) when searching up', () => {
+      assert.deepEqual(
+        getConversationInDirection(fakeConversations, up, undefined),
+        { conversationId: fakeConversations[2].id }
+      );
+      assert.isUndefined(getConversationInDirection(noUnreads, up, undefined));
+    });
+
+    it('if no conversation is selected, finds the first unread conversation (if it exists) when searching down', () => {
+      assert.deepEqual(
+        getConversationInDirection(fakeConversations, down, undefined),
+        { conversationId: fakeConversations[1].id }
+      );
+      assert.isUndefined(
+        getConversationInDirection(noUnreads, down, undefined)
+      );
+    });
+
+    it("searches up for unread conversations, returning undefined if no conversation exists (doesn't wrap around)", () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          up,
+          fakeConversations[3].id
+        ),
+        { conversationId: fakeConversations[2].id }
+      );
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          up,
+          fakeConversations[2].id
+        ),
+        { conversationId: fakeConversations[1].id }
+      );
+      assert.isUndefined(
+        getConversationInDirection(
+          fakeConversations,
+          up,
+          fakeConversations[1].id
+        )
+      );
+      assert.isUndefined(
+        getConversationInDirection(noUnreads, up, noUnreads[2].id)
+      );
+    });
+
+    it("searches down for unread conversations, returning undefined if no conversation exists (doesn't wrap around)", () => {
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          down,
+          fakeConversations[0].id
+        ),
+        { conversationId: fakeConversations[1].id }
+      );
+      assert.deepEqual(
+        getConversationInDirection(
+          fakeConversations,
+          down,
+          fakeConversations[1].id
+        ),
+        { conversationId: fakeConversations[2].id }
+      );
+      assert.isUndefined(
+        getConversationInDirection(
+          fakeConversations,
+          down,
+          fakeConversations[2].id
+        )
+      );
+      assert.isUndefined(
+        getConversationInDirection(noUnreads, down, noUnreads[1].id)
+      );
+    });
+  });
+});