List out various ways in which TestNG can be invoked?

TestNG is an open-source Java testing framework, and there are various ways to invoke TestNG. Such as:

• The simplest way is to use a command line where you specify the TestNG JAR file and the test suite XML file with the Java command.
• Another way is to invoke TestNG with an integrated development environment (IDE) such as Eclipse, IntelliJ IDEA, or NetBeans.
• Build tools such as Maven and Gradle are another easy option to invoke TestNG.
• Continuous integration(CI) servers such as Jenkins, Travis CI, or CircleCI can be used to run TestNG tests.