TestNG: assertNotNull: Assert object is not null

‘assertNotNull’ method is used to assert that given object is not null.

‘assertNotNull’ method is available in below overloaded forms.

public static void assertNotNull(Object object)

public static void assertNotNull(Object object, String message)

AssertNotNullTest.java

package com.sample.app.assertions;

import static org.testng.Assert.assertNotNull;

import org.testng.annotations.Test;

public class AssertNotNullTest {

 @Test
 public void test1() {
  Object obj = null;
  assertNotNull(obj, "obj is null");
 }

 @Test
 public void test2() {
  Object obj = new Object();
  assertNotNull(obj);
 }
}

Run AssertNotNullTest.java, you will see below messages in console.

[RemoteTestNG] detected TestNG version 7.0.0
PASSED: test2
FAILED: test1
java.lang.AssertionError: obj is null expected object to not be null
 at org.testng.Assert.fail(Assert.java:97)
 at org.testng.Assert.assertNotNull(Assert.java:874)
 at com.sample.app.assertions.AssertNotNullTest.test1(AssertNotNullTest.java:12)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:133)
 at org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:584)
 at org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:172)
 at org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
 at org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:804)
 at org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:145)
 at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
 at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
 at java.util.ArrayList.forEach(ArrayList.java:1257)
 at org.testng.TestRunner.privateRun(TestRunner.java:770)
 at org.testng.TestRunner.run(TestRunner.java:591)
 at org.testng.SuiteRunner.runTest(SuiteRunner.java:402)
 at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:396)
 at org.testng.SuiteRunner.privateRun(SuiteRunner.java:355)
 at org.testng.SuiteRunner.run(SuiteRunner.java:304)
 at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
 at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
 at org.testng.TestNG.runSuitesSequentially(TestNG.java:1180)
 at org.testng.TestNG.runSuitesLocally(TestNG.java:1102)
 at org.testng.TestNG.runSuites(TestNG.java:1032)
 at org.testng.TestNG.run(TestNG.java:1000)
 at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:115)
 at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
 at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)


===============================================
    Default test
    Tests run: 2, Failures: 1, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 2, Passes: 1, Failures: 1, Skips: 0
===============================================

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