In TestNG, we cannot define a suite in testing source code, but it is represented by one XML file, as suite is the feature of execution.
testng.xml is an XML file that describes configuration of TestNG test suite. Using Testng.xml file we can run test available in one or more class file and make them as a single group, hence making test more meaningful, we call them as scenario based testing.
A suite is represented by one XML file. It can contain one or more tests and is defined by the tag.
A test is represented by and can contain one or more TestNG classes.
A TestNG class is a Java class that contains at least one TestNG annotation. It is represented by the tag and can contain one or more test methods.
A test method is a Java method annotated by @Test in your source.
Can we run test without using testng.xml file?
Well answer is yes, you can run. But once your test become larger and requires configuration of multiple test at one place, the best option is testng.xml.
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