support playwright helper (#81)

Author: kobenguyent

index.js

@@ -77,16 +77,16 @@ class ResembleHelper extends Helper {
           if (!data.isSameDimensions) {
             let dimensions1 = sizeOf(baseImage);
             let dimensions2 = sizeOf(actualImage);
-            reject(new Error("The base image is of " + dimensions1.height + " X " + dimensions1.width + " and actual image is of " + dimensions2.height + " X " + dimensions2.width + ". Please use images of same dimensions so as to avoid any unexpected results."));
+            reject(new Error(`The base image is of ${dimensions1.height} X ${dimensions1.width} and actual image is of ${dimensions2.height} X ${dimensions2.width}. Please use images of same dimensions so as to avoid any unexpected results.`));
           }
           resolve(data);
           if (data.misMatchPercentage >= tolerance) {
             if (!fs.existsSync(getDirName(this.diffFolder + diffImage))) {
-                fs.mkdirSync(getDirName(this.diffFolder + diffImage));
+              fs.mkdirSync(getDirName(this.diffFolder + diffImage));
             }
             fs.writeFileSync(this.diffFolder + diffImage + '.png', data.getBuffer());
             const diffImagePath = path.join(process.cwd(), this.diffFolder + diffImage + '.png');
-            this.debug("Diff Image File Saved to: " + diffImagePath);
+            this.debug(`Diff Image File Saved to: ${diffImagePath}`);
           }
         }
       });
@@ -114,15 +114,13 @@ class ResembleHelper extends Helper {
    */
   async screenshotElement(selector, name) {
     const helper = this._getHelper();
-    if (this.helpers['Puppeteer']) {
+    if (this.helpers['Puppeteer'] || this.helpers['Playwright']) {
       await helper.waitForVisible(selector);
       const els = await helper._locate(selector);
       if (!els.length) throw new Error(`Element ${selector} couldn't be located`);
       const el = els[0];
 
-      await el.screenshot({
-        path: global.output_dir + "/" + name + '.png'
-      });
+      await el.screenshot({path: `${global.output_dir}/${name}.png`});
     } else if (this.helpers['WebDriver']) {
       await helper.waitForVisible(selector);
       const els = await helper._locate(selector);
@@ -137,7 +135,7 @@ class ResembleHelper extends Helper {
       const { t } = this.helpers['TestCafe'];
 
       await t.takeElementScreenshot(els, name);
-    } else throw new Error("Method only works with Puppeteer, WebDriver or TestCafe helpers.");
+    } else throw new Error("Method only works with Playwright, Puppeteer, WebDriver or TestCafe helpers.");
   }
 
   /**
@@ -381,7 +379,7 @@ class ResembleHelper extends Helper {
     const helper = this._getHelper();
     await helper.waitForVisible(selector);
     const els = await helper._locate(selector);
-    
+
     if (this.helpers['TestCafe']) {
       if (await els.count != 1) throw new Error(`Element ${selector} couldn't be located or isn't unique on the page`);
     }
@@ -391,7 +389,7 @@ class ResembleHelper extends Helper {
 
     let location, size;
 
-    if (this.helpers['Puppeteer']) {
+    if (this.helpers['Puppeteer'] || this.helpers['Playwright']) {
       const el = els[0];
       const box = await el.boundingBox();
       size = location = box;
@@ -447,7 +445,11 @@ class ResembleHelper extends Helper {
       return this.helpers['TestCafe'];
     }
 
-    throw new Error('No matching helper found. Supported helpers: WebDriver/Appium/Puppeteer/TestCafe');
+    if (this.helpers['Playwright']) {
+      return this.helpers['Playwright'];
+    }
+
+    throw new Error('No matching helper found. Supported helpers: Playwright/WebDriver/Appium/Puppeteer/TestCafe');
   }
 }