Jakarta snippet support test implementation

src/test/GradleSingleModJakartaLSTest.ts

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+import { TextEditor, EditorView, VSBrowser } from 'vscode-extension-tester';
+import * as utils from './utils/testUtils';
+import * as path from 'path';
+import * as assert from 'assert';
+
+describe('LSP4Jakarta LS test for snippet test', () => {
+
+    let editor: TextEditor;
+
+    it('check if correct code is inserted when rest_class snippet is triggered',  async() => {
+        await VSBrowser.instance.openResources(path.join(utils.getGradleProjectPath(), "src", "main", "java", "test", "gradle", "liberty", "web", "app", "SystemResource.java"));
+
+        editor = await new EditorView().openEditor('SystemResource.java') as TextEditor;
+
+        const textPressent = await editor.getText();
+        if(textPressent.length > 0){
+            await editor.clearText();
+        }
+
+        await utils.delay(85000);
+        await editor.typeText("rest");
+        await utils.delay(6000);
+
+        //open the assistant
+        const assist = await editor.toggleContentAssist(true);
+        await utils.delay(6000);
+        // toggle can return void, so we need to make sure the object is present
+        if (assist) {
+            // to select an item use
+            await assist.select('rest_class');
+        }
+        await utils.delay(6000);
+
+        // close the assistant
+        await editor.toggleContentAssist(false);
+
+        const insertedCode = await editor.getText();
+        await utils.delay(6000);
+        assert(insertedCode.includes('public String methodname() {'), 'Snippet rest_class was not inserted correctly.');
+
+        await editor.clearText();
+        await editor.save();
+    }).timeout(475000);
+
+});