add test

Author: Zedwag

packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/chatTextArea.tests.js

@@ -542,6 +542,28 @@ QUnit.module('ChatTextArea', moduleConfig, () => {
 
             assert.strictEqual(this.sendButton.option('disabled'), true, 'send button is disabled after adding file that fail validation');
         });
+
+        QUnit.test('send button should not be disabled after removing file that fail validation', function(assert) {
+            this.reinit({
+                fileUploaderOptions: {
+                    uploadFile: () => {},
+                    allowedFileExtensions: ['.jpg'],
+                },
+            });
+            const fileUploader = this.getFileUploader();
+            fileUploader.option('value', [fakeFile]);
+            fileUploader.upload();
+
+            this.clock.tick();
+
+            assert.strictEqual(this.sendButton.option('disabled'), true, 'send button is disabled');
+
+            const $cancelButton = this.$element.find(`.${FILEUPLOADER_CANCEL_BUTTON_CLASS}`);
+
+            $cancelButton.trigger('dxclick');
+
+            assert.strictEqual(this.sendButton.option('disabled'), true, 'send button is not disabled');
+        });
     });
 
     QUnit.module('Informer integration', {