TestNG: assertTrue: Assert condition is true

'assertTrue' method is used to assert that a condition is true. It is availble in below two forms.

public static void assertTrue(boolean condition)

public static void assertTrue(boolean condition, String message)

When the assertion failed, then the test case fails with given message.

Calculator.java

package com.sample.app.arithmetic;

public class Calculator {
 public int add(int a, int b) {
  return a + b;
 }

 public int subtract(int a, int b) {
  return a - b;
 }

 public int mul(int a, int b) {
  return a * b;
 }

 public int div(int a, int b) {
  return a / b;
 }

 public int remainder(int a, int b) {
  return a % b;
 }

 public boolean isEven(int number) {
  return number % 2 == 0;
 }

 public boolean isOdd(int number) {
  return number % 2 != 0;
 }
}

AssertTrueTest.java

package com.sample.app.assertions;

import static org.testng.Assert.assertTrue;

import org.testng.annotations.Test;

import com.sample.app.arithmetic.Calculator;

public class AsserTrueTest {
 private Calculator calc = new Calculator();

 @Test
 public void isEven_4_true() {
  assertTrue(calc.isEven(4));
 }

 @Test
 public void isEven_5_false() {
  assertTrue(!calc.isEven(5));
 }
 
 @Test
 public void failMe() {
  assertTrue(false, "Failing the test case");
 }
}

Run AssertTrueTest, you will see below messages in console.

[RemoteTestNG] detected TestNG version 7.0.0
PASSED: isEven_4_true
PASSED: isEven_5_false
FAILED: failMe
java.lang.AssertionError: Failing the test case did not expect to find [true] but found [false]
 at org.testng.Assert.fail(Assert.java:97)
 at org.testng.Assert.failNotEquals(Assert.java:969)
 at org.testng.Assert.assertTrue(Assert.java:43)
 at com.sample.app.assertions.AsserTrueTest.failMe(AsserTrueTest.java:24)
 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: 3, Failures: 1, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 3, Passes: 2, Failures: 1, Skips: 0
===============================================

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