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How to add custom messages to TestNG failure?
TestNG supports a lot of assertions. It has the org.testng.Assert class, which extends the Java object class java.lang.object. Whenever there is a failure, the user wants to get a customized failure message so that the root-cause analysis could be easy. TestNG supports assertion with customized failure message. However, message is completely optional.
The syntax is −
Assert.<assertMethod>(expected, actual, message)
If the user doesn't provide a message, TestNG prints a default error message; but if the user sets a message, then TestNG throws the error along with the customized message set by the user.
In this article, we will see how to set a custom message to a TestNG failure.
Approach/Algorithm to solve this problem
Step 1 − Create a TestNG class, NewTestngClass.
Step 2 − Write three different @Test methods in the class to get failed at three different assertions as shown in the programming code section below.
Step 3 − Create the testNG.xml as given below to run the TestNG classes.
Step 4 − Finally, run the testNG.xml or directly TestNG class in IDE or compile and run it using command line.
Example
Use the following code for the commonTestNG class, NewTestngClass −
src/ NewTestngClass.java
import org.testng.Assert;
import org.testng.annotations.*;
public class NewTestngClass {
@Test
public void test1() {
System.out.println("Running test1");
int Id = 1;
int newId = 2 ;
Assert.assertEquals(Id, newId,"Assert equals validation between id and newId");
}
@Test
public void test2() {
System.out.println("Running test2");
String Id = null;
Assert.assertNotNull(Id, "Assert not null validation for Id is failed. Id is null");
}
@Test
public void test3() {
System.out.println("Running test3");
Boolean Id = false;
Assert.assertTrue(Id,"Assert True validation failed as Id is not set to true");
}
}testng.xml
This is a configuration file that is used to organize and run the TestNG test cases. It is very handy when limited tests are needed to execute rather than the full suite.
<?xml version = "1.0" encoding = "UTF-8"?> <!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" > <suite name = "Suite1"> <test name = "test1"> <classes> <class name = "NewTestngClass"/> </classes> </test> </suite>
Output
Running test1 java.lang.AssertionError: Assert equals validation between id and newId expected [2] but found [1] Expected :2 Actual :1 ......... Running test2 java.lang.AssertionError: Assert not null validation for Id is failed. Id is null expected object to not be null ............ Running test3 java.lang.AssertionError: Assert True validation failed as Id is not set to true expected [true] but found [false] Expected :true Actual :false ...........
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