fix(screenshots): throw on 0x0 screenshots

lib/ExecutionContext.js

@@ -504,6 +504,8 @@ class ElementHandle extends JSHandle {
 
     boundingBox = await this.boundingBox();
     assert(boundingBox, 'Node is either not visible or not an HTMLElement');
+    assert(boundingBox.width !== 0, 'Node has 0 width.');
+    assert(boundingBox.height !== 0, 'Node has 0 height.');
 
     const { layoutViewport: { pageX, pageY } } = await this._client.send('Page.getLayoutMetrics');
 

lib/Page.js

@@ -835,6 +835,8 @@ class Page extends EventEmitter {
       assert(typeof options.clip.y === 'number', 'Expected options.clip.y to be a number but found ' + (typeof options.clip.y));
       assert(typeof options.clip.width === 'number', 'Expected options.clip.width to be a number but found ' + (typeof options.clip.width));
       assert(typeof options.clip.height === 'number', 'Expected options.clip.height to be a number but found ' + (typeof options.clip.height));
+      assert(options.clip.width !== 0, 'Expected options.clip.width not to be 0.');
+      assert(options.clip.height !== 0, 'Expected options.clip.width not to be 0.');
     }
     return this._screenshotTaskQueue.postTask(this._screenshotTask.bind(this, screenshotType, options));
   }

test/screenshot.spec.js

@@ -218,10 +218,11 @@ module.exports.addTests = function({testRunner, expect, product}) {
       const screenshotError = await elementHandle.screenshot().catch(error => error);
       expect(screenshotError.message).toBe('Node is either not visible or not an HTMLElement');
     });
-    xit('should not hang with zero width/height element', async({page, server}) => {
-      await page.setContent('<div style="width: 0; height: 0"></div>');
+    it('should not hang with zero width/height element', async({page, server}) => {
+      await page.setContent('<div style="width: 50px; height: 0"></div>');
       const div = await page.$('div');
-      await div.screenshot();
+      const error = await div.screenshot().catch(e => e);
+      expect(error.message).toBe('Node has 0 height.');
     });
   });