Test: Add test case for generating empty line code block

Author: kkangmj

src/test/suite/extension.test.ts

@@ -1,15 +1,46 @@
-import * as assert from 'assert';
+import * as assert from "assert";
+import * as vscode from "vscode";
+import { Position } from "vscode";
+import * as path from "path";
 
-// You can import and use all API from the 'vscode' module
-// as well as import your extension to test it
-import * as vscode from 'vscode';
-// import * as myExtension from '../../extension';
+export const TEST_WORKSPACE_PATH = path.resolve(__dirname, "..", "..", "test");
+export const TEST_MD_FILE_PATH = path.resolve(TEST_WORKSPACE_PATH, "test.md");
 
-suite('Extension Test Suite', () => {
-	vscode.window.showInformationMessage('Start all tests.');
+function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms);
+  });
+}
 
-	test('Sample test', () => {
-		assert.strictEqual(-1, [1, 2, 3].indexOf(5));
-		assert.strictEqual(-1, [1, 2, 3].indexOf(0));
-	});
+suite("Generating Code Block", () => {
+  test("Empty line code block.", async () => {
+    const document = await vscode.workspace.openTextDocument(TEST_MD_FILE_PATH);
+    const editor = await vscode.window.showTextDocument(document);
+
+    // Initialize Editor
+    await editor.edit((editBuilder) => {
+      const fullRange = new vscode.Range(
+        new vscode.Position(0, 0),
+        document.positionAt(document.getText().length)
+      );
+      editBuilder.delete(fullRange);
+    });
+
+    const position = editor.selection.active;
+
+    // Exectue Command
+    await vscode.commands.executeCommand(
+      "markdown.extension.codeBlock.emptyLine"
+    );
+
+    await sleep(300);
+
+    const newPosition = editor.selection.active;
+
+    // Assert
+    assert.strictEqual(position.line, newPosition.line - 1);
+
+    const actual = document.getText().replace(/\r\n/g, "");
+    assert.strictEqual(actual, `\`\`\`\`\`\``);
+  });
 });