Add error handling example.

Author: heraclmene

examples/error-handling/main.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+
+	goselenium "github.com/bunsenapp/go-selenium"
+)
+
+func main() {
+	// Create the capabilities.
+	capabilities := goselenium.Capabilities{}
+	capabilities.SetBrowser(goselenium.FirefoxBrowser())
+
+	// Create the driver.
+	driver, err := goselenium.NewSeleniumWebDriver("http://localhost:4444/wd/hub/", capabilities)
+	if err != nil {
+		fmt.Println("Error creating web driver.")
+		return
+	}
+
+	// Create the session.
+	_, err = driver.CreateSession()
+	if err != nil {
+		fmt.Println("Error creating session.")
+		return
+	}
+
+	// Navigate to Google.
+	_, err = driver.Go("https://www.google.com")
+	if err != nil {
+		fmt.Println("An error occurred whilst visiting URL.")
+		return
+	}
+
+	// Find a non existent element for it to error.
+	_, err = driver.FindElement(goselenium.ByCSSSelector("mynonexistentelement"))
+	if err != nil {
+		// Switch the different types of errors. You do not need to do this in
+		// every call and can simply abstract it behind a function. If you
+		// don't want to handle the custom errors, they all implement the
+		// Error interface meaning it'll work anywhere your normal errors do.
+		switch err.(type) {
+		case goselenium.CommunicationError:
+			e := err.(goselenium.CommunicationError)
+			// Switch the different states that we want to handle.
+			switch e.Response.State {
+			case goselenium.UnknownError:
+				fmt.Println("An unknown error occurred.")
+			case goselenium.SessionNotCreated:
+				fmt.Println("The session was not created.")
+			case goselenium.NoSuchElement:
+				fmt.Println("Failed to find element. Example passed!")
+			}
+		case goselenium.UnmarshallingError:
+			fmt.Println("An unmarshalling error occurred :<")
+		}
+	}
+
+	// Delete the session.
+	driver.DeleteSession()
+}