fix(lazy-load): lazyLoadOffset option does not work

lib/static/components/state/screenshot.js

@@ -27,7 +27,7 @@ class Screenshot extends Component {
         const {lazyLoadOffset: offset} = this.props;
 
         return offset
-            ? <LazyLoad offsetVertical={offset} debounce={50} placeholder={placeholder} once>{elem}</LazyLoad>
+            ? <LazyLoad offset={offset} debounce={50} placeholder={placeholder} once>{elem}</LazyLoad>
             : elem;
     }
 

test/lib/static/components/section/screenshot.js

@@ -0,0 +1,49 @@
+import React from 'react';
+import Screenshot from 'lib/static/components/state/screenshot';
+import {mkConnectedComponent} from '../utils';
+
+describe('Screenshot component', () => {
+    const getLazyLoadComponent_ = ({lazyLoadOffset = 1} = {}) => {
+        const screenshotComponent = mkConnectedComponent(
+            <Screenshot image={{path: ''}} />,
+            {initialState: {view: {lazyLoadOffset}}}
+        );
+
+        return screenshotComponent.find('LazyLoad');
+    };
+
+    describe('LazyLoad component', () => {
+        it('should set "debounce" option', () => {
+            const lazyLoadComponent = getLazyLoadComponent_();
+
+            assert.equal(lazyLoadComponent.props().debounce, 50);
+        });
+
+        it('should set "once" option', () => {
+            const lazyLoadComponent = getLazyLoadComponent_();
+
+            assert.isTrue(lazyLoadComponent.props().once);
+        });
+
+        it('should pass offset from store to LazyLoad component', () => {
+            const lazyLoadComponent = getLazyLoadComponent_({lazyLoadOffset: 333});
+
+            assert.equal(lazyLoadComponent.props().offset, 333);
+        });
+
+        it('should not set placeholder by default', () => {
+            const lazyLoadComponent = getLazyLoadComponent_();
+
+            assert.lengthOf(lazyLoadComponent.find('Placeholder'), 0);
+        });
+
+        it('should set placeholder to LazyLoad component if passed image has size', () => {
+            const screenshotComponent = mkConnectedComponent(
+                <Screenshot image={{path: '', size: {}}} />,
+                {initialState: {view: {lazyLoadOffset: 1}}}
+            );
+
+            assert.lengthOf(screenshotComponent.find('Placeholder'), 1);
+        });
+    });
+});