Package com.clarkware.junitperf

Class LoadTest

java.lang.Object
com.clarkware.junitperf.LoadTest
All Implemented Interfaces:
junit.framework.Test
public class LoadTest extends Object implements junit.framework.Test
The LoadTest is a test decorator that runs a test with a simulated number of concurrent users and iterations.

In its simplest form, a LoadTest is constructed with a test to decorate and the number of concurrent users.

For example, to create a load test of 10 concurrent users with each user running ExampleTest once and all users started simultaneously, use: 

 Test loadTest = new LoadTest(new TestSuite(ExampleTest.class), 10);

or, to load test a single test method, use: 

 Test loadTest = new LoadTest(new ExampleTest("testSomething"), 10);

The load can be ramped by specifying a pluggable Timer instance which prescribes the delay between the addition of each concurrent user. A ConstantTimer has a constant delay, with a zero value indicating that all users will be started simultaneously. A RandomTimer has a random delay with a uniformly distributed variation.

For example, to create a load test of 10 concurrent users with each user running ExampleTest.testSomething() once and with a one second delay between the addition of users, use: 

 Timer timer = new ConstantTimer(1000);
 Test loadTest = new LoadTest(new ExampleTest("testSomething"), 10, timer);

In order to simulate each concurrent user running a test for a specified number of iterations, a LoadTest can be constructed to decorate a RepeatedTest. Alternatively, a LoadTest convenience constructor specifying the number of iterations is provided which creates a RepeatedTest.

For example, to create a load test of 10 concurrent users with each user running ExampleTest.testSomething() for 20 iterations, and with a one second delay between the addition of users, use: 

 Timer timer = new ConstantTimer(1000);
 Test repeatedTest = new RepeatedTest(new ExampleTest("testSomething"), 20);
 Test loadTest = new LoadTest(repeatedTest, 10, timer);

or, alternatively, use: 

 Timer timer = new ConstantTimer(1000);
 Test loadTest = new LoadTest(new ExampleTest("testSomething"), 10, 20, timer);

A LoadTest can be decorated as a TimedTest to test the elapsed time of the load test. For example, to decorate the load test constructed above as a timed test with a maximum elapsed time of 2 seconds, use: 

 Test timedTest = new TimedTest(loadTest, 2000);

By default, a LoadTest does not enforce test atomicity (as defined in transaction processing) if its decorated test spawns threads, either directly or indirectly. In other words, if a decorated test spawns a thread and then returns control without waiting for its spawned thread to complete, then the test is assumed to be transactionally complete.

If threads are integral to the successful completion of a decorated test, meaning that the decorated test should not be treated as complete until all of its threads complete, then setEnforceTestAtomicity(true) should be invoked to enforce test atomicity. This effectively causes the load test to wait for the completion of all threads belonging to the same ThreadGroup as the thread running the decorated test.

Author:
Mike Clark, Clarkware Consulting, Inc., Ervin Varga

  • Constructor Summary

    Constructors
    Constructor
    Description
    LoadTest(junit.framework.Test test, int users)
    Constructs a LoadTest to decorate the specified test using the specified number of concurrent users starting simultaneously.
    LoadTest(junit.framework.Test test, int users, int iterations)
    Constructs a LoadTest to decorate the specified test using the specified number of concurrent users starting simultaneously and the number of iterations per user.
    LoadTest(junit.framework.Test test, int users, int iterations, Timer timer)
    Constructs a LoadTest to decorate the specified test using the specified number of concurrent users, number of iterations per user, and delay timer.
    LoadTest(junit.framework.Test test, int users, Timer timer)
    Constructs a LoadTest to decorate the specified test using the specified number of concurrent users and delay timer.

  • Method Summary

    Modifier and Type
    Method
    Description
    protected void
    cleanup()
     
    int
    countTestCases()
    Returns the number of tests in this load test.
    protected long
    getDelay()
     
    void
    run(junit.framework.TestResult result)
    Runs the test.
    void
    setEnforceTestAtomicity(boolean isAtomic)
    Indicates whether test atomicity should be enforced.
    protected void
    sleep(long time)
     
    String
    toString()
     
    protected void
    waitForAllThreadsToComplete()
     
    protected void
    waitForTestCompletion()
     
    protected void
    waitForThreadedTestThreadsToComplete()
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Constructor Details

    • LoadTest

      public LoadTest(junit.framework.Test test, int users)
      Constructs a LoadTest to decorate the specified test using the specified number of concurrent users starting simultaneously.
      Parameters:
      test - Test to decorate.
      users - Number of concurrent users.

    • LoadTest

      public LoadTest(junit.framework.Test test, int users, int iterations)
      Constructs a LoadTest to decorate the specified test using the specified number of concurrent users starting simultaneously and the number of iterations per user.
      Parameters:
      test - Test to decorate.
      users - Number of concurrent users.
      iterations - Number of iterations per user.

    • LoadTest

      public LoadTest(junit.framework.Test test, int users, int iterations, Timer timer)
      Constructs a LoadTest to decorate the specified test using the specified number of concurrent users, number of iterations per user, and delay timer.
      Parameters:
      test - Test to decorate.
      users - Number of concurrent users.
      iterations - Number of iterations per user.
      timer - Delay timer.

    • LoadTest

      public LoadTest(junit.framework.Test test, int users, Timer timer)
      Constructs a LoadTest to decorate the specified test using the specified number of concurrent users and delay timer.
      Parameters:
      test - Test to decorate.
      users - Number of concurrent users.
      timer - Delay timer.

  • Method Details

    • setEnforceTestAtomicity

      public void setEnforceTestAtomicity(boolean isAtomic)
      Indicates whether test atomicity should be enforced.

      If threads are integral to the successful completion of a decorated test, meaning that the decorated test should not be treated as complete until all of its threads complete, then setEnforceTestAtomicity(true) should be invoked to enforce test atomicity. This effectively causes the load test to wait for the completion of all threads belonging to the same ThreadGroup as the thread running the decorated test.

      Parameters:
      isAtomic - true to enforce test atomicity; false otherwise.

    • countTestCases

      public int countTestCases()
      Returns the number of tests in this load test.
      Specified by:
      countTestCases in interface junit.framework.Test
      Returns:
      Number of tests.

    • run

      public void run(junit.framework.TestResult result)
      Runs the test.
      Specified by:
      run in interface junit.framework.Test
      Parameters:
      result - Test result.

    • waitForTestCompletion

      protected void waitForTestCompletion()

    • waitForThreadedTestThreadsToComplete

      protected void waitForThreadedTestThreadsToComplete()

    • waitForAllThreadsToComplete

      protected void waitForAllThreadsToComplete()

    • sleep

      protected void sleep(long time)

    • cleanup

      protected void cleanup()

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • getDelay

      protected long getDelay()