Unable to run a TestNG with Gradle - gradle

Question

I have a simple code which runs with TestNG, but I am unable to run the same with Gradle, as it says no main method is found, which is, well, not surprising since I am using annotations.
But in such a scenario, how to run the code if I must use Gradle.
Kindly note, I am very new to Gradle, and do not harbour much knowledge about the same.
Code:
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
public class tryTestNG
{
#BeforeClass
public void setup()
{
System.out.println("I am in Setup");
}
#Test
public void test()
{
System.out.println("I am in Test");
}
#AfterClass
public void tearDown()
{
System.out.println("I am in tearDown");
}
}
The above code runs perfectly with TestNG Library. However not with Gradle.
Here is my Gradle Build setup:
apply plugin: 'java'
apply plugin: 'application'
mainClassName = 'tryTestNG'
sourceCompatibility = 1.7
targetCompatibility = 1.7
version = '1.0'
repositories {
mavenCentral()
}
test {
useTestNG()
}
dependencies {
compile group: 'org.testng', name: 'testng', version: '6.9.10'
}
The Gradle returns that there is no Main Method.
Working Directory: /home/avirup/MyWorkspace/JavaWorkspace/TestNGGradle
Gradle User Home: /home/avirup/.gradle
Gradle Distribution: Gradle wrapper from target build
Gradle Version: 2.9
Java Home: /usr/lib/jvm/java-8-oracle
JVM Arguments: None
Program Arguments: None
Gradle Tasks: run
:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:runError: Main method not found in class tryTestNG, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':run'.
> Process 'command '/usr/lib/jvm/java-8-oracle/bin/java'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 0.514 secs
Thanks for your help.

Answer 1

There's no need to use application plugin to run tests.
The build.gradle should be:
apply plugin: 'java'
sourceCompatibility = 1.7
targetCompatibility = 1.7
version = '1.0'
repositories {
mavenCentral()
}
test {
useTestNG()
}
dependencies {
compile group: 'org.testng', name: 'testng', version: '6.9.10'
}
And the command: gradle test. Also, put tryTestNG under src/test/java and name it with capital letter.
Here is a demo.
Also mind that println statements from tests won't be visible in console. To view them navigate to test report. It's under: <project_dir>/build/reports/tests/index.html.