fix: Add workarounds for selenium bug (fossasia#2173)

Tests are working correctly on local machine,
but in Travis, the click is obscured by overlapping
element because it first scrolls the element into
view and then tries to click on it.

The workaround should be reverted once it is fixed

src/selenium/basePage.js

@@ -44,6 +44,10 @@ const BasePage = {
     return el.click();
   },
 
+  jsClick(el) {
+    return this.driver.executeScript("arguments[0].click();", el);
+  },
+
   toggleStarredButton: function() {
     return this.find(By.id('starred')).then(this.click);
   },
@@ -55,7 +59,8 @@ const BasePage = {
     sessionIds.forEach(function(sessionId) {
       const promElem = new Promise(function(resolve, reject) {
         self.find(By.id(sessionId)).then(function(el) {
-          el.findElement(By.className('bookmark')).then(self.click).then(function() {
+          // TODO: Revert when fixed. Workaround for https://github.com/angular/protractor/issues/3093
+          self.jsClick(el.findElement(By.className('bookmark'))).then(function() {
             resolve('done');
           });
         });
@@ -217,8 +222,9 @@ const BasePage = {
     const pageVertScrollOffset = 'return window.scrollY';
 
     return new Promise(function(resolve) {
-      self.find(By.id(sessionTitleId)).then(self.click).then(function() {
-        self.find(By.id(sessionDetailId)).findElement(By.css('a')).click().then(self.getPageUrl.bind(self)).then(function(url) {
+      // TODO: Revert when fixed. Workaround for https://github.com/angular/protractor/issues/3093
+      self.jsClick(self.find(By.id(sessionTitleId))).then(function() {
+        self.jsClick(self.find(By.id(sessionDetailId)).findElement(By.css('a'))).then(self.getPageUrl.bind(self)).then(function(url) {
           self.driver.executeScript(pageVertScrollOffset).then(function(height) {
             resolve(height > 0 && url.search('speakers') !== -1);
           });