PLT-7518 Added unit tests for channel linking (#7352)

* PLT-7518 Added unit tests for channel linking

* Removed unused escaping function

webapp/tests/utils/formatting_channel_links.test.jsx

@@ -0,0 +1,49 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import assert from 'assert';
+
+import * as TextFormatting from 'utils/text_formatting.jsx';
+
+describe('TextFormatting.ChannelLinks', () => {
+    it('Not channel links', (done) => {
+        assert.equal(
+            TextFormatting.formatText('~123').trim(),
+            '<p>~123</p>'
+        );
+
+        assert.equal(
+            TextFormatting.formatText('~town-square').trim(),
+            '<p>~town-square</p>'
+        );
+
+        done();
+    });
+
+    it('Channel links', (done) => {
+        assert.equal(
+            TextFormatting.formatText('~town-square', {
+                channelNamesMap: {'town-square': {display_name: 'Town Square'}},
+                team: {name: 'myteam'}
+            }).trim(),
+            '<p><a class="mention-link" href="/myteam/channels/town-square" data-channel-mention="town-square">~Town Square</a></p>'
+        );
+        assert.equal(
+            TextFormatting.formatText('~town-square.', {
+                channelNamesMap: {'town-square': {display_name: 'Town Square'}},
+                team: {name: 'myteam'}
+            }).trim(),
+            '<p><a class="mention-link" href="/myteam/channels/town-square" data-channel-mention="town-square">~Town Square</a>.</p>'
+        );
+
+        assert.equal(
+            TextFormatting.formatText('~town-square', {
+                channelNamesMap: {'town-square': {display_name: '<b>Reception</b>'}},
+                team: {name: 'myteam'}
+            }).trim(),
+            '<p><a class="mention-link" href="/myteam/channels/town-square" data-channel-mention="town-square">~&lt;b&gt;Reception&lt;/b&gt;</a></p>'
+        );
+
+        done();
+    });
+});