TestNG email and OTP testing
Use MailSlurp in TestNG suites to create inboxes, wait for verification emails, and extract OTP codes.
MailSlurp fits TestNG when your Java suite drives the UI or API workflow and the MailSlurp Java client handles inbox creation and message retrieval. This is a strong fit for email OTP, magic link, notification, and password reset checks in browser suites.
Install
Maven:
<dependency>
<groupId>com.mailslurp</groupId>
<artifactId>mailslurp-client-java</artifactId>
<version>LATEST</version>
<type>pom</type>
</dependency>
Gradle:
dependencies {
implementation("com.mailslurp:mailslurp-client-java")
}
Create an inbox with the Java SDK
InboxDto inbox = inboxControllerApi.createInboxWithDefaults().execute();
// verify inbox
assertEquals(inbox.getEmailAddress().contains("@mailslurp"), true);
assertNotNull(inbox.getId());
Example TestNG OTP flow
import com.mailslurp.apis.InboxControllerApi;
import com.mailslurp.apis.WaitForControllerApi;
import com.mailslurp.clients.ApiClient;
import com.mailslurp.clients.Configuration;
import com.mailslurp.models.Email;
import com.mailslurp.models.InboxDto;
import org.testng.annotations.Test;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;
public class SignupOtpTest {
@Test
public void completesEmailVerification() throws Exception {
ApiClient defaultClient = Configuration.getDefaultApiClient();
defaultClient.setApiKey(System.getenv("API_KEY"));
defaultClient.setConnectTimeout(120_000);
defaultClient.setReadTimeout(120_000);
defaultClient.setWriteTimeout(120_000);
InboxControllerApi inboxControllerApi = new InboxControllerApi(defaultClient);
WaitForControllerApi waitForControllerApi = new WaitForControllerApi(defaultClient);
InboxDto inbox = inboxControllerApi.createInboxWithDefaults().execute();
// Submit inbox.getEmailAddress() in the app under test here.
Email email =
waitForControllerApi
.waitForLatestEmail()
.inboxId(inbox.getId())
.timeout(120_000L)
.unreadOnly(true)
.execute();
Matcher matcher = Pattern
.compile("(?:verification code|OTP|code)[:\\\\s-]*(\\\\d{6})")
.matcher(email.getBody());
assertTrue(matcher.find());
assertNotNull(matcher.group(1));
}
}