Myujth

I want to build an automation testing, so I have to know the errors that appear in the console of chrome.

there is an option to get the error lines that appear in the console?

In order to see the console: right click somewhere in the page, click "inspect element" and then go to "console".

I don't know C# but here's Java code that does the job, I hope you can translate it to C#

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.logging.LogEntries;
import org.openqa.selenium.logging.LogEntry;
import org.openqa.selenium.logging.LogType;
import org.openqa.selenium.logging.LoggingPreferences;
import org.openqa.selenium.remote.CapabilityType;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

public class ChromeConsoleLogging 
 private WebDriver driver;


 @BeforeMethod
 public void setUp() 
 System.setProperty("webdriver.chrome.driver", "c:\path\to\chromedriver.exe"); 
 DesiredCapabilities caps = DesiredCapabilities.chrome();
 LoggingPreferences logPrefs = new LoggingPreferences();
 logPrefs.enable(LogType.BROWSER, Level.ALL);
 caps.setCapability(CapabilityType.LOGGING_PREFS, logPrefs);
 driver = new ChromeDriver(caps);
 

 @AfterMethod
 public void tearDown() 
 driver.quit();
 

 public void analyzeLog() 
 LogEntries logEntries = driver.manage().logs().get(LogType.BROWSER);
 for (LogEntry entry : logEntries) 
 System.out.println(new Date(entry.getTimestamp()) + " " + entry.getLevel() + " " + entry.getMessage());
 //do something useful with the data
 
 

 @Test
 public void testMethod() 
 driver.get("http://mypage.com");
 //do something on page
 analyzeLog();
 

Pay attention to setUp method in above code. We use LoggingPreferences object to enable logging. There are a few types of logs, but if you want to track console errors then LogType.BROWSER is the one that you should use. Then we pass that object to DesiredCapabilities and further to ChromeDriver constructor and voila - we have an instance of ChromeDriver with logging enabled.

After performing some actions on page we call analyzeLog() method. Here we simply extract the log and iterate through its entries. Here you can put assertions or do any other reporting you want.

My inspiration was this code by Michael Klepikov that explains how to extract performance logs from ChromeDriver.

You can get logs this way:

Driver().Manage().Logs.GetLog();

By specifying what log you are interested in you can get the browser log, that is:

Driver().Manage().Logs.GetLog(LogType.Browser);

Also remember to setup your driver accordingly:

ChromeOptions options = new ChromeOptions();
options.SetLoggingPreference(LogType.Browser, LogLevel.All);
driver = new ChromeDriver("path to driver", options);

This is the c# code for logging the brower log from chrome.

private void CheckLogs()
 
 List<LogEntry> logs = Driver.Manage().Logs.GetLog(LogType.Browser).ToList();
 foreach (LogEntry log in logs)
 
 Log(log.Message);
 
 

here is my code for the actual log:

 public void Log(string value, params object values)
 
 // allow indenting
 if (!String.IsNullOrEmpty(value) && value.Length > 0 && value.Substring(0, 1) != "*")
 
 value = " " + value;
 

 // write the log
 Console.WriteLine(String.Format(value, values));
 

As per issue 6832 logging is not implemented yet for C# bindings. So there might not be an easy way to get this working as of now.

driver.manage().logs().get("browser")

Gets all logs printed on the console. I was able to get all logs except Violations. Please have a look here Chrome Console logs not printing Violations

public void Test_DetectMissingFilesToLoadWebpage()
 
 try
 
 List<LogEntry> logs = driver.Manage().Logs.GetLog(LogType.Browser).ToList();
 foreach (LogEntry log in logs)
 
 while(logs.Count > 0)
 
 String logInfo = log.ToString();
 if (log.Message.Contains("Failed to load resource: the server responded with a status of 404 (Not Found)"))
 
 Assert.Fail();
 
 else
 
 Assert.Pass();
 
 
 
 
 catch (NoSuchElementException e)
 
 test.Fail(e.StackTrace);
 
 

You could do something like this in C#. It is a complete test case. Then print the console output as String i.e logInfo in your report. For some reason, Log(log.Message) from the solution above this one gave me build errors.So, I replaced it.