feat: Initial clean release of CHM

packages/editor/CodeMirror/editorCommands/duplicateLine.test.ts

@@ -0,0 +1,31 @@
+import { EditorView } from '@codemirror/view';
+import { EditorSelection } from '@codemirror/state';
+import duplicateLine from './duplicateLine';
+
+describe('duplicateLine', () => {
+	it('should duplicate line', () => {
+		const initialText = 'Hello\nWorld\n';
+		const editorView = new EditorView({
+			doc: initialText,
+			selection: EditorSelection.cursor(0),
+		});
+
+		duplicateLine(editorView);
+
+		const result = editorView.state.doc.toString();
+		expect(result).toBe('Hello\nHello\nWorld\n');
+	});
+
+	it('should duplicate range', () => {
+		const initialText = 'Hello\nWorld\n';
+		const editorView = new EditorView({
+			doc: initialText,
+			selection: EditorSelection.range(0, 8),
+		});
+
+		duplicateLine(editorView);
+
+		const result = editorView.state.doc.toString();
+		expect(result).toBe('Hello\nWoHello\nWorld\n');
+	});
+});