Class LoadTest
- All Implemented Interfaces:
junit.framework.Test
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
ConstructorsConstructorDescriptionLoadTest
(junit.framework.Test test, int users) Constructs aLoadTest
to decorate the specified test using the specified number of concurrent users starting simultaneously.LoadTest
(junit.framework.Test test, int users, int iterations) Constructs aLoadTest
to decorate the specified test using the specified number of concurrent users starting simultaneously and the number of iterations per user.Constructs aLoadTest
to decorate the specified test using the specified number of concurrent users, number of iterations per user, and delay timer.Constructs aLoadTest
to decorate the specified test using the specified number of concurrent users and delay timer. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
cleanup()
int
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) toString()
protected void
protected void
protected void
-
Constructor Details
-
LoadTest
public LoadTest(junit.framework.Test test, int users) Constructs aLoadTest
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 aLoadTest
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
Constructs aLoadTest
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
Constructs aLoadTest
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 sameThreadGroup
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 interfacejunit.framework.Test
- Returns:
- Number of tests.
-
run
public void run(junit.framework.TestResult result) Runs the test.- Specified by:
run
in interfacejunit.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
-
getDelay
protected long getDelay()
-