You can run specific test class(es) and method(s) using the following syntax:

1. full package : mvn test -Dtest="com.oracle.tests.**"

2. all method in a class : mvn test -Dtest=CLASS_NAME1

3. single method from single class :mvn test -Dtest=CLASS_NAME1#METHOD_NAME1

4. multiple method from multiple class : mvn test -Dtest=CLASS_NAME1#METHOD_NAME1,CLASS_NAME2#METHOD_NAME2

Run a single test method from a test class.

mvn test -Dtest=Test1#methodname

Other related use-cases

• mvn test // Run all the unit test classes

• mvn test -Dtest=Test1 // Run a single test class

• mvn test -Dtest=Test1,Test2 // Run multiple test classes

• mvn test -Dtest=Test1#testFoo* // Run all test methods that match pattern 'testFoo*' from a test class.

• mvn test -Dtest=Test1#testFoo*+testBar* // Run all test methods match pattern 'testFoo*' and 'testBar*' from a test class.

I tried several solutions provided in this thread, however they were not working for module which depends on a different one. In that case I had to run mvn from the root-module with additional parameters: -am (--also-make), which tells maven to built modules which your test module depends on and -DfailIfNoTests=false, otherwise "No tests were executed!" error appears.

mvn test -pl B -Dtest=MyTestClass#myTest -am -DfailIfNoTests=false

pom.xml section in root:

<modules>
    <module>A</module>
    <module>B</module>
<modules>

B depends on A.

First you need to clean your maven project

mvn clean

then you can run specific file and function using

mvn test -Dtest=testClassName#testCaseName

As of surefire plugin version 2.22.1 (possibly earlier) you can run single test using testnames property when using testng.xml

Given a following testng.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite">
    <test name="all-tests">
        <classes>
            <class name="server.Atest"/>
            <class name="server.Btest"/>
            <class name="server.Ctest"/>
        </classes>
    </test>
    <test name="run-A-test">
        <classes>
            <class name="server.Atest"/>
        </classes>
    </test>
    <test name="run-B-test">
        <classes>
            <class name="server.Btest"/>
        </classes>
    </test>
    <test name="run-C-test">
        <classes>
            <class name="server.Ctest"/>
        </classes>
    </test>
</suite> 

with the pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    [...]
    <properties>
        <selectedTests>all-tests</selectedTests>
    </properties>
    [...]
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.22.1</version>
            <configuration>
                <suiteXmlFiles>
                    <file>src/test/resources/testng.xml</file>
                </suiteXmlFiles>
                <properties>
                    <property>
                        <name>testnames</name>
                        <value>${selectedTests}</value>
                    </property>
                </properties>
            </configuration>
        </plugin>
    </plugins>
    [...]
</project>

From command line

mvn clean test -DselectedTests=run-B-test

Further reading - Maven surefire plugin using testng

You need to specify the JUnit test class and its method to be executed.

mvn test -Dtest=com.mycompany.AppTest#testMethod

https://metamug.com/article/java/build-run-java-maven-project-command-line.html#running-unit-tests