How do you assert in TestNG?

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Asserting in TestNG

Understanding TestNG Assertions

Assertions in TestNG are essential for validating expected outcomes during test execution. Here's how you can assert in TestNG:

TestNG's Assert Class

1. Import Assert Class:

   • To use assertions in TestNG, start by importing the Assert class from the TestNG framework.
   java

1. import org.testng.Assert;

2. Assert Methods:

   • TestNG provides various assert methods within the Assert class for different types of validations, such as assertEquals, assertTrue, assertFalse, and more.

Common Assert Methods

1. assertEquals:

   • Verifies if two values are equal.
   java

• Assert.assertEquals(actual, expected, "Assertion message for failure");

• assertTrue and assertFalse:

  • Checks if a given condition is true or false.
  java
• Assert.assertTrue(condition, "Assertion message for failure"); Assert.assertFalse(condition, "Assertion message for failure");

• assertNull and assertNotNull:

  • Validates if a value is null or not null.
  java
• Assert.assertNull(value, "Assertion message for failure"); Assert.assertNotNull(value, "Assertion message for failure");

• assertSame and assertNotSame:

  • Ensures that two objects refer to the same or different objects in memory.
  java

4. Assert.assertSame(actual, expected, "Assertion message for failure"); Assert.assertNotSame(actual, expected, "Assertion message for failure");

Practical Example

Consider a simple example: