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How to Limiting the Number of Parallel Tests with ThreadCount in TestNG?
TestNG supports multi−threading i.e. a @Test methods can be invoked parallelly. A test or multiple test methods can be invoked from multiple threads. Therefore, multiVthread is useful if @Test methods need to be run asynchronously in parallel.
Multi−threading can be achieved by using keyword − thread−count =<integer> at Testng.xml. Thread count is basically number of instances running to execute multiple tests simultaneously or parallelly. The attribute thread−count allows the user to specify how many threads should be run for this execution.
In this example, 5 @Test method will execute in parallel from 5 threads.
In this article, we will illustrate how to achieve multithreading.
Approach/Algorithm to Solve this Problem
Step 1: Create a TestNG class − NewTestngClass.
Step 2: Write 5 @Test methods in the class − NewTestngClass as shown in programming code section.
Step 3: Now create the testNG.xml as given below to run the TestNG classes. Add thread−ount and parallel keyword.
Step 4: Now, run the testNG.xml or directly testNG class in IDE or compile and run it using command line.
In the output, user can see total 5 threads are running in parallel − ID 18 to 22.
Example
The following code for common TestNG class − NewTestngClass:
src/ NewTestngClass.java
import org.testng.ITestContext;
import org.testng.annotations.*;
public class NewTestngClass {
@Test()
public void testcase1(ITestContext testContext){
System.out.println("Thread ID: "+Thread.currentThread().getId());
int currentCount = testContext.getAllTestMethods()[0].getCurrentInvocationCount();
System.out.println("Executing count: " + currentCount);
}
@Test()
public void testcase2(ITestContext testContext){
System.out.println("Thread ID: "+Thread.currentThread().getId());
int currentCount = testContext.getAllTestMethods()[1].getCurrentInvocationCount();
System.out.println("Executing count: " + currentCount);
}
@Test()
public void testcase3(ITestContext testContext){
System.out.println("Thread ID: "+Thread.currentThread().getId());
int currentCount = testContext.getAllTestMethods()[2].getCurrentInvocationCount();
System.out.println("Executing count: " + currentCount);
}
@Test()
public void testcase4(ITestContext testContext){
System.out.println("Thread ID: "+Thread.currentThread().getId());
int currentCount = testContext.getAllTestMethods()[3].getCurrentInvocationCount();
System.out.println("Executing count: " + currentCount);
}
@Test()
public void testcase5(ITestContext testContext){
System.out.println("Thread ID: "+Thread.currentThread().getId());
int currentCount = testContext.getAllTestMethods()[4].getCurrentInvocationCount();
System.out.println("Executing count: " + currentCount);
}
}
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 full suite.
<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name = "Suite1" thread-count="5" parallel="methods">
<test name = "test1">
<classes>
<class name = "NewTestngClass"/>
</classes>
</test>
</suite>
Output
Thread ID: 18 Thread ID: 22 Thread ID: 19 Executing count: 0 Thread ID: 20 Executing count: 0 Thread ID: 21 Executing count: 0 Executing count: 0 Executing count: 0 =============================================== Suite1 Total tests run: 5, Passes: 5, Failures: 0, Skips: 0 ===============================================
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