}

        @Override
        public ExecutionResult assertTasksExecuted(Object... taskPaths) {
            Set<String> flattenedTasks = new TreeSet<>(flattenTaskPaths(taskPaths));
            assertEquals(new TreeSet<>(flattenedTasks), new TreeSet<>(executedTasks));
            outputResult.assertTasksExecuted(flattenedTasks);
            return this;
        }

        @Override

import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

/**
 * Displays the dependency tree for a configuration.
 */
@DisableCachingByDefault(because = "Abstract super-class, not to be instantiated directly")

        "'files=' + tree.files.name.sort()"                                                             | "files=[file1, file2]"      | "files=[file1, file2, file3]"      | "files=[file2, file3]"
        "'files=' + { def names = new TreeSet(); tree.visit { d -> names.add(d.file.name) }; names }()" | "files=[dir, file1, file2]" | "files=[dir, file1, file2, file3]" | "files=[dir, file2, file3]"
        // TODO - should not invalidate the cache for this expression

        "CopyOnWriteArraySet<String>"        | "['a', 'b', 'c'] as CopyOnWriteArraySet"  | "[a, b, c]"
        "TreeSet<String>"                    | "['a', 'b', 'c'] as TreeSet"              | "[a, b, c]"
        "EnumSet<SomeEnum>"                  | "EnumSet.of(SomeEnum.Two)"                | "[Two]"

          }
        };
    assertFailure(tester);
  }

  /**
   * This Iterator wraps another iterator and gives it a bug found in JDK6.
   *
   * <p>This bug is this: if you create an iterator from a TreeSet and call next() on that iterator
   * when hasNext() is false, so that next() throws a NoSuchElementException, then subsequent calls
   * to remove() will incorrectly throw an IllegalStateException, instead of removing the last

          }
        };
    assertFailure(tester);
  }

  /**
   * This Iterator wraps another iterator and gives it a bug found in JDK6.
   *
   * <p>This bug is this: if you create an iterator from a TreeSet and call next() on that iterator
   * when hasNext() is false, so that next() throws a NoSuchElementException, then subsequent calls
   * to remove() will incorrectly throw an IllegalStateException, instead of removing the last