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package org.junit.experimental.max;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import junit.framework.TestSuite;
import org.junit.internal.requests.SortingRequest;
import org.junit.internal.runners.ErrorReportingRunner;
import org.junit.internal.runners.JUnit38ClassRunner;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.Result;
import org.junit.runner.Runner;
import org.junit.runners.Suite;
import org.junit.runners.model.InitializationError;

/**
 * A replacement for JUnitCore, which keeps track of runtime and failure history, and reorders tests
 * to maximize the chances that a failing test occurs early in the test run.
 *
 * The rules for sorting are:
 * 
    *
  1. Never-run tests first, in arbitrary order *
  2. Group remaining tests by the date at which they most recently failed. *
  3. Sort groups such that the most recent failure date is first, and never-failing tests are at the end. *
  4. Within a group, run the fastest tests first. *
*/ public class MaxCore { private static final String MALFORMED_JUNIT_3_TEST_CLASS_PREFIX = "malformed JUnit 3 test class: "; /** * Create a new MaxCore from a serialized file stored at storedResults * * @deprecated use storedLocally() */ @Deprecated public static MaxCore forFolder(String folderName) { return storedLocally(new File(folderName)); } /** * Create a new MaxCore from a serialized file stored at storedResults */ public static MaxCore storedLocally(File storedResults) { return new MaxCore(storedResults); } private final MaxHistory history; private MaxCore(File storedResults) { history = MaxHistory.forFolder(storedResults); } /** * Run all the tests in class. * * @return a {@link Result} describing the details of the test run and the failed tests. */ public Result run(Class testClass) { return run(Request.aClass(testClass)); } /** * Run all the tests contained in request. * * @param request the request describing tests * @return a {@link Result} describing the details of the test run and the failed tests. */ public Result run(Request request) { return run(request, new JUnitCore()); } /** * Run all the tests contained in request. * * This variant should be used if {@code core} has attached listeners that this * run should notify. * * @param request the request describing tests * @param core a JUnitCore to delegate to. * @return a {@link Result} describing the details of the test run and the failed tests. */ public Result run(Request request, JUnitCore core) { core.addListener(history.listener()); return core.run(sortRequest(request).getRunner()); } /** * @return a new Request, which contains all of the same tests, but in a new order. */ public Request sortRequest(Request request) { if (request instanceof SortingRequest) { // We'll pay big karma points for this return request; } List leaves = findLeaves(request); Collections.sort(leaves, history.testComparator()); return constructLeafRequest(leaves); } private Request constructLeafRequest(List leaves) { final List runners = new ArrayList(); for (Description each : leaves) { runners.add(buildRunner(each)); } return new Request() { @Override public Runner getRunner() { try { return new Suite((Class) null, runners) { }; } catch (InitializationError e) { return new ErrorReportingRunner(null, e); } } }; } private Runner buildRunner(Description each) { if (each.toString().equals("TestSuite with 0 tests")) { return Suite.emptySuite(); } if (each.toString().startsWith(MALFORMED_JUNIT_3_TEST_CLASS_PREFIX)) { // This is cheating, because it runs the whole class // to get the warning for this method, but we can't do better, // because JUnit 3.8's // thrown away which method the warning is for. return new JUnit38ClassRunner(new TestSuite(getMalformedTestClass(each))); } Class type = each.getTestClass(); if (type == null) { throw new RuntimeException("Can't build a runner from description [" + each + "]"); } String methodName = each.getMethodName(); if (methodName == null) { return Request.aClass(type).getRunner(); } return Request.method(type, methodName).getRunner(); } private Class getMalformedTestClass(Description each) { try { return Class.forName(each.toString().replace(MALFORMED_JUNIT_3_TEST_CLASS_PREFIX, "")); } catch (ClassNotFoundException e) { return null; } } /** * @param request a request to run * @return a list of method-level tests to run, sorted in the order * specified in the class comment. */ public List sortedLeavesForTest(Request request) { return findLeaves(sortRequest(request)); } private List findLeaves(Request request) { List results = new ArrayList(); findLeaves(null, request.getRunner().getDescription(), results); return results; } private void findLeaves(Description parent, Description description, List results) { if (description.getChildren().isEmpty()) { if (description.toString().equals("warning(junit.framework.TestSuite$1)")) { results.add(Description.createSuiteDescription(MALFORMED_JUNIT_3_TEST_CLASS_PREFIX + parent)); } else { results.add(description); } } else { for (Description each : description.getChildren()) { findLeaves(description, each, results); } } } }




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