google3/third_party/java_src/junit/test/java/org/junit/tests/manipulation/OrderableTest.java

package org.junit.tests.manipulation;

import static org.junit.Assert.assertEquals;
import junit.framework.JUnit4TestAdapter;
import org.junit.Before;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.Request;
import org.junit.runner.RunWith;
import org.junit.runner.Runner;
import org.junit.runner.manipulation.Orderer;
import org.junit.runner.manipulation.InvalidOrderingException;
import org.junit.runner.manipulation.Orderable;
import org.junit.runner.manipulation.Sorter;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.MethodSorters;

@RunWith(Enclosed.class)
public class OrderableTest {
 
    public static class TestClassRunnerIsOrderable {
        private static String log = "";

        public static class OrderMe {
            @Test
            public void a() {
                log += "a";
            }

            @Test
            public void b() {
                log += "b";
            }

            @Test
            public void c() {
                log += "c";
            }
        }

        @FixMethodOrder(MethodSorters.NAME_ASCENDING)
        public static class DoNotOrderMe {
            @Test
            public void a() {
                log += "a";
            }

            @Test
            public void b() {
                log += "b";
            }

            @Test
            public void c() {
                log += "c";
            }
        }

        @Before
        public void resetLog() {
            log = "";
        }

        @Test
        public void orderingForwardWorksOnTestClassRunner() {
            Request forward = Request.aClass(OrderMe.class).orderWith(
                    AlphanumericOrdering.INSTANCE);

            new JUnitCore().run(forward);
            assertEquals("abc", log);
        }

        @Test
        public void orderingBackwardWorksOnTestClassRunner() {
            Request backward = Request.aClass(OrderMe.class).orderWith(
                    new ReverseAlphanumericOrdering());

            new JUnitCore().run(backward);
            assertEquals("cba", log);
        }
        
        @Test
        public void orderingBackwardDoesNothingOnTestClassRunnerWithFixMethodOrder() {
            Request backward = Request.aClass(DoNotOrderMe.class).orderWith(
                    new ReverseAlphanumericOrdering());

            new JUnitCore().run(backward);
            assertEquals("abc", log);
        }

        @RunWith(Enclosed.class)
        public static class Enclosing {
            public static class A {
                @Test
                public void a() {
                    log += "Aa";
                }

                @Test
                public void b() {
                    log += "Ab";
                }

                @Test
                public void c() {
                    log += "Ac";
                }
            }

            public static class B {
                @Test
                public void a() {
                    log += "Ba";
                }

                @Test
                public void b() {
                    log += "Bb";
                }

                @Test
                public void c() {
                    log += "Bc";
                }
            }
        }

        @Test
        public void orderingForwardWorksOnSuite() {
            Request forward = Request.aClass(Enclosing.class).orderWith(
                    AlphanumericOrdering.INSTANCE);

            new JUnitCore().run(forward);
            assertEquals("AaAbAcBaBbBc", log);
        }

        @Test
        public void orderingBackwardWorksOnSuite() {
            Request backward = Request.aClass(Enclosing.class).orderWith(
                    new ReverseAlphanumericOrdering());

            new JUnitCore().run(backward);
            assertEquals("BcBbBaAcAbAa", log);
        }
    }

    public static class TestOrderableClassRunnerIsSortable {
        private static String log = "";

        /**
         * A Runner that implements {@link Orderable}.
         */
        public static class OrderableRunner extends Runner implements Orderable {
            private final BlockJUnit4ClassRunner delegate;

            public OrderableRunner(Class<?> klass) throws Throwable {
                delegate = new BlockJUnit4ClassRunner(klass);
            }
            
            @Override
            public void run(RunNotifier notifier) {
                delegate.run(notifier);
            }
                
            @Override
            public Description getDescription() {
                return delegate.getDescription();
            }

            public void order(Orderer orderer) throws InvalidOrderingException {
                delegate.order(orderer);
            }

            public void sort(Sorter sorter) {
                delegate.sort(sorter);
            }
        }

        @RunWith(OrderableRunner.class)
        public static class OrderMe {
            @Test
            public void a() {
                log += "a";
            }

            @Test
            public void b() {
                log += "b";
            }

            @Test
            public void c() {
                log += "c";
            }
        }

        @Before
        public void resetLog() {
            log = "";
        }

        @Test
        public void orderingorwardWorksOnTestClassRunner() {
            Request forward = Request.aClass(OrderMe.class).orderWith(
                    AlphanumericOrdering.INSTANCE);

            new JUnitCore().run(forward);
            assertEquals("abc", log);
        }

        @Test
        public void orderedBackwardWorksOnTestClassRunner() {
            Request backward = Request.aClass(OrderMe.class).orderWith(
                    new ReverseAlphanumericOrdering());

            new JUnitCore().run(backward);
            assertEquals("cba", log);
        }
    }

    public static class TestClassRunnerIsOrderableWithSuiteMethod {
        private static String log = "";

        public static class OrderMe {
            @Test
            public void a() {
                log += "a";
            }

            @Test
            public void b() {
                log += "b";
            }

            @Test
            public void c() {
                log += "c";
            }

            public static junit.framework.Test suite() {
                return new JUnit4TestAdapter(OrderMe.class);
            }
        }

        @Before
        public void resetLog() {
            log = "";
        }

        @Test
        public void orderingForwardWorksOnTestClassRunner() {
            Request forward = Request.aClass(OrderMe.class).orderWith(AlphanumericOrdering.INSTANCE);

            new JUnitCore().run(forward);
            assertEquals("abc", log);
        }

        @Test
        public void orderingBackwardWorksOnTestClassRunner() {
            Request backward = Request.aClass(OrderMe.class).orderWith(
                    new ReverseAlphanumericOrdering());

            new JUnitCore().run(backward);
            assertEquals("cba", log);
        }
    }

    public static class UnOrderableRunnersAreHandledWithoutCrashing {
        public static class UnOrderableRunner extends Runner {
            public UnOrderableRunner(Class<?> klass) {
            }

            @Override
            public Description getDescription() {
                return Description.EMPTY;
            }

            @Override
            public void run(RunNotifier notifier) {
            }
        }

        @RunWith(UnOrderableRunner.class)
        public static class UnOrderable {
            @Test
            public void a() {
            }
        }

        @Test
        public void unOrderablesAreHandledWithoutCrashing() {
            Request unordered = Request.aClass(UnOrderable.class).orderWith(
                    AlphanumericOrdering.INSTANCE);
            new JUnitCore().run(unordered);
        }
    }
}