add test for snippets

src/editor/snippets.test.ts

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2021 The Pybricks Authors
+
+import ace from 'ace-builds';
+
+import './snippets';
+
+type Snippets = {
+    snippetText: string;
+    scope: string;
+};
+
+it('indents with tabs', () => {
+    const { snippetText, scope } = ace.require('ace/snippets/python') as Snippets;
+
+    expect(scope).toBe('python');
+
+    for (const line of snippetText.split('\n')) {
+        expect(line).not.toMatch(/^(\t* )+\t*/);
+    }
+});