Add a test for table range prettyfier.

Author: darkriszty

test/tableRangePrettyfier.test.ts

@@ -0,0 +1,15 @@
+import * as assert from 'assert';
+import * as vscode from 'vscode';
+import * as mockVsCode from "./mockVsCodeClasses";
+import { TableRangePrettyfier } from "../src/tableRangePrettyfier";
+
+suite("TableRangePrettyfier tests", () => {
+
+    test("provideDocumentRangeFormattingEdits() whole document selection returns empty text edits", () => {
+        const trp = new TableRangePrettyfier();
+        const textDoc = new mockVsCode.MockMarkdownTextDocument("hello world");
+        const textEdits = trp.provideDocumentRangeFormattingEdits(textDoc, textDoc.getFullRange(), null, null);
+
+        assert.equal(textEdits.length, 0);
+    });
+});