TestNG- No tests found. Nothing was run

Question

UTF-8 io.rest-assured rest-assured 4.1.2 test org.testng testng 6.14.3 ************************************************** TestNg.xml

Answer 1

make sure you are importing org.testng.annotations.Test and not org.junit.Test

Answer 2

This error message implies that TestNG didn't find any @Test to execute.

[TestNG] No tests found. Nothing was run

Make sure you have imported Test annotation & used @Test to execute.

import org.testng.annotations.Test;

Answer 3

As per your code reference testng.xml and your test class there is no method getTestNgTest1 inside the class com.rest.api.authentications.OAuth2APITest

Change the testng.xml to the below one probably it will work

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
    <suite guice-stage="DEVELOPMENT" name="Default suite">
      <test thread-count="5" verbose="2" name="Default test">
        <classes>
          <class name="com.rest.api.authentications.OAuth2APITest" />
        </classes>
      </test> <!-- Default test -->
    </suite> <!-- Default suite -->

Answer 4

Your pom.xml has to include maven surefire plugin inside <build>...</build> tags:

<properties>
...
</properties>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.19.1</version>
            <configuration>
                <suiteXmlFiles>
                    <suiteXmlFile>src/test/testng.xml</suiteXmlFile>
                </suiteXmlFiles>
            </configuration>
        </plugin>
    </plugins>
</build>
<dependencies>
...
</dependencies>

Then you can execute your tests by running mvn test.
Bare in mind it will pick up every class that has a ...test suffix and look for methods annotated with @Test only in such classes.

How to execute a single test (question in comments):
You can provide method name in testng.xml file, like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="testSuite" verbose="1">
    <test name="tests">
        <classes>
            <class name="className">
                <methods>
                    <include name="testMethodName"></include>
                </methods>
            </class>
        </classes>
    </test>
</suite>

Or simply run it via maven:

mvn test -Dtest=className#methodName

When executing a single test via maven, you might need to add -DfailIfNoTests=false so that maven does not fail, when multiple modules exist.