[JS] Add code sample for executeScript and takeElementScreenshot

Author: harsha509

Diff for: examples/javascript/test/interactions/windows.spec.js

@@ -1,24 +1,24 @@
-const {Builder} = require('selenium-webdriver');
+const {Builder, By} = require('selenium-webdriver');
 const chrome = require('selenium-webdriver/chrome');
 const assert = require("node:assert");
 let opts = new chrome.Options();
 opts.addArguments('--headless');
-
 let startIndex = 0
 let endIndex = 5
 let pdfMagicNumber = 'JVBER'
+let imgMagicNumber = 'iVBOR'
 let base64Code
 
 describe('Interactions - Windows', function () {
   let driver;
-
   before(async function () {
     driver = await new Builder().forBrowser('chrome').setChromeOptions(opts).build();
   });
 
   after(async () => await driver.quit());
 
   it('Should be able to print page to pdf', async function () {
+
     await driver.get('https://www.selenium.dev/selenium/web/alerts.html');
     let base64 = await driver.printPage({pageRanges: ["1-2"]});
     // page can be saved as a PDF as below
@@ -27,4 +27,24 @@ describe('Interactions - Windows', function () {
     base64Code = base64.slice(startIndex, endIndex)
     assert.strictEqual(base64Code, pdfMagicNumber)
   });
+
+  it('Should be able to get text using executeScript', async function () {
+    await driver.get('https://www.selenium.dev/selenium/web/javascriptPage.html');
+    // Stores the header element
+    let header = await driver.findElement(By.css('h1'));
+
+    // Executing JavaScript to capture innerText of header element
+    let text = await driver.executeScript('return arguments[0].innerText', header);
+    assert.strictEqual(text, `Type Stuff`)
+  });
+
+  it('Should be able to take Element Screenshot', async function () {
+    await driver.get('https://www.selenium.dev/selenium/web/javascriptPage.html');
+
+    let header = await driver.findElement(By.css('h1'));
+    // Captures the element screenshot
+    let encodedString = await header.takeScreenshot(true);
+    base64Code = encodedString.slice(startIndex, endIndex)
+    assert.strictEqual(base64Code, imgMagicNumber)
+  });
 });