Solidify the contact form tests

Author: wakaleo

src/test/java/com/serenitydojo/playwright/toolshop/contact/ContactForm.java

@@ -3,9 +3,12 @@
 import com.microsoft.playwright.Locator;
 import com.microsoft.playwright.Page;
 import com.microsoft.playwright.options.AriaRole;
+import com.microsoft.playwright.options.WaitForSelectorState;
 
 import java.nio.file.Path;
 
+import static com.microsoft.playwright.assertions.PlaywrightAssertions.assertThat;
+
 public class ContactForm {
     private final Page page;
     private Locator firstNameField;
@@ -59,5 +62,6 @@ public String getAlertMessage() {
 
     public void clearField(String fieldName) {
         page.getByLabel(fieldName).clear();
+        assertThat(page.getByLabel(fieldName)).isEmpty();
     }
 }