java - What is the best practice to determine the execution time of the business relevant code of my junit?

Question

The test execution time which is displayed in eclipse->junit-view depends on the whole test case execution which includes:

• Testdata preperation
• Executing businesslogic
• assert results

I need a more detailed statement about the execution time of my businesslogic and only my businesslogic. That is what I have done inside my testcase:

Date lNow = new Date();
List<Geo> lAllBasisGeo = mGeoEvaluator.evaluateAllGeo(lGeoFixture.getGeo(), lAllGeo);
Date lStop = new Date();
System.out.println("Time of execution in seconds:"+((lStop.getTime()-lNow.getTime())/1000));

Well... I think I determine the time in a realy awkward way. Furthermore I dont think that it is necessary to declare two Date variables.

I need advice writing that code more efficiently...

Answer 1

in a unit test I would prefer to add a timeout to the Test with a JUnit 4 annotation, to determine whether the test passes (fast enough) or not:

@Test(timeout=100)//let the test fail after 100 MilliSeconds
public void infinity() {
  while(true);
}

To determine the exact Runtime of your business logic I would add the Time statements right before and after your critical Codepath like you did, repeat it several times to get scholastically correct results, and remove the statements again, so slim the code.

long start = System.currentTimeMillis();
//execute logic in between
long end = System.currentTimeMillis();
System.out.println("DEBUG: Logic A took " + (end - start) + " MilliSeconds");