/*
    * Copyright (C) 2009 The Guava Authors
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.common.collect.testing;
  
  import com.google.common.annotations.GwtCompatible;
  
  import junit.framework.TestCase;
  
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  
  /**
   * Unit test for {@link MinimalIterable}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible
  public class MinimalIterableTest extends TestCase {
  
    public void testOf_empty() {
      Iterable<String> iterable = MinimalIterable.<String>of();
      Iterator<String> iterator = iterable.iterator();
      assertFalse(iterator.hasNext());
      try {
        iterator.next();
        fail();
      } catch (NoSuchElementException expected) {
      }
      try {
        iterable.iterator();
        fail();
      } catch (IllegalStateException expected) {
      }
    }
  
    public void testOf_one() {
      Iterable<String> iterable = MinimalIterable.of("a");
      Iterator<String> iterator = iterable.iterator();
      assertTrue(iterator.hasNext());
      assertEquals("a", iterator.next());
      assertFalse(iterator.hasNext());
      try {
        iterator.next();
        fail();
      } catch (NoSuchElementException expected) {
      }
      try {
        iterable.iterator();
        fail();
      } catch (IllegalStateException expected) {
      }
    }
  
    public void testFrom_empty() {
      Iterable<String> iterable
          = MinimalIterable.from(Collections.<String>emptySet());
      Iterator<String> iterator = iterable.iterator();
      assertFalse(iterator.hasNext());
      try {
        iterator.next();
        fail();
      } catch (NoSuchElementException expected) {
      }
      try {
        iterable.iterator();
        fail();
      } catch (IllegalStateException expected) {
      }
    }
  
    public void testFrom_one() {
      Iterable<String> iterable
          = MinimalIterable.from(Collections.singleton("a"));
      Iterator<String> iterator = iterable.iterator();
      assertTrue(iterator.hasNext());
      assertEquals("a", iterator.next());
      try {
        iterator.remove();
        fail();
      } catch (UnsupportedOperationException expected) {
      }
      assertFalse(iterator.hasNext());
      try {
        iterator.next();
       fail();
     } catch (NoSuchElementException expected) {
     }
     try {
       iterable.iterator();
       fail();
     } catch (IllegalStateException expected) {
     }
   }
 }