/**
* Evaluates the test case to define if test generation has reached a plateau. The test case
* generation is considered to have reached a plateau if the current test case is observed to gain
* less than the plateau threshold of added coverage in the current best exploration option (up to
* 'depth' new steps). The plateau threshold is defined in the exploration configuration.
*
* @param suite The suite where we grab the current test from to check for plateau.
* @param steps How many steps to check for the plateau.
* @return True if plateau is reached. False otherwise.
*/
private boolean isTestPlateau(TestSuite suite, int steps) {
TestCase currentTest = suite.getCurrentTest();
int length = currentTest.getSteps().size();
// steps + 1 is to measure gain for last "steps" number of steps correctly
// for example, suite has four steps: A,B,C,D and we request to look at last 3
// if we count different between D and B, we get gain of last two which is C and D
// so we must look at different between gain in end of A and in end of D. this requires the + 1
int index = length - (steps + 1);
if (index < steps) {
// not possible to check the plateau if test is not long enough
return false;
}
int now = currentTest.getCurrentStep().getAddedCoverage();
int before = currentTest.getSteps().get(index).getAddedCoverage();
// TestCoverage coverage = suite.getCoverage();
// int now = scoreCalculator.addedScoreFor(coverage, currentTest);
//// int before = scoreCalculator.addedScoreFor(coverage, currentTest, length-steps);
// int before = scoreCalculator.addedScoreFor(coverage, currentTest);
int diff = now - before;
// is the added value more than the given threshold?
return diff < config.getTestPlateauThreshold();
}
