speed up Ruby test devtools_spec.rb

instead of sleeping for 2.5s, just wait for the needed logs.

Author: asolntsev

rb/spec/integration/selenium/webdriver/devtools_spec.rb

@@ -100,26 +100,20 @@ module WebDriver
 
       it 'notifies about log messages' do
         logs = []
-        driver.on_log_event(:console) { |log| logs.push(log) }
+        driver.on_log_event(:console) { |log| logs.push(log.args[0]) }
         driver.navigate.to url_for('javascriptPage.html')
 
-        driver.execute_script("console.log('I like cheese');")
-        sleep 0.5
         driver.execute_script('console.log(true);')
-        sleep 0.5
         driver.execute_script('console.log(null);')
-        sleep 0.5
         driver.execute_script('console.log(undefined);')
-        sleep 0.5
         driver.execute_script('console.log(document);')
-        sleep 0.5
+        driver.execute_script("console.log('I like cheese');")
 
-        expect(logs).to include(
-          an_object_having_attributes(type: :log, args: ['I like cheese']),
-          an_object_having_attributes(type: :log, args: [true]),
-          an_object_having_attributes(type: :log, args: [nil]),
-          an_object_having_attributes(type: :log, args: [{'type' => 'undefined'}])
-        )
+        wait.until { logs.include?('I like cheese') }
+
+        expect(logs).to include(true)
+        expect(logs).to include(nil)
+        expect(logs).to include({'type' => 'undefined'})
       end
 
       it 'notifies about document log messages' do