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      1 /*
      2  * Copyright (C) 2009 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing;
     18 
     19 import com.google.common.annotations.GwtCompatible;
     20 
     21 import junit.framework.TestCase;
     22 
     23 import java.util.Collections;
     24 import java.util.Iterator;
     25 import java.util.NoSuchElementException;
     26 
     27 /**
     28  * Unit test for {@link MinimalIterable}.
     29  *
     30  * @author Kevin Bourrillion
     31  */
     32 @GwtCompatible
     33 public class MinimalIterableTest extends TestCase {
     34 
     35   public void testOf_empty() {
     36     Iterable<String> iterable = MinimalIterable.<String>of();
     37     Iterator<String> iterator = iterable.iterator();
     38     assertFalse(iterator.hasNext());
     39     try {
     40       iterator.next();
     41       fail();
     42     } catch (NoSuchElementException expected) {
     43     }
     44     try {
     45       iterable.iterator();
     46       fail();
     47     } catch (IllegalStateException expected) {
     48     }
     49   }
     50 
     51   public void testOf_one() {
     52     Iterable<String> iterable = MinimalIterable.of("a");
     53     Iterator<String> iterator = iterable.iterator();
     54     assertTrue(iterator.hasNext());
     55     assertEquals("a", iterator.next());
     56     assertFalse(iterator.hasNext());
     57     try {
     58       iterator.next();
     59       fail();
     60     } catch (NoSuchElementException expected) {
     61     }
     62     try {
     63       iterable.iterator();
     64       fail();
     65     } catch (IllegalStateException expected) {
     66     }
     67   }
     68 
     69   public void testFrom_empty() {
     70     Iterable<String> iterable
     71         = MinimalIterable.from(Collections.<String>emptySet());
     72     Iterator<String> iterator = iterable.iterator();
     73     assertFalse(iterator.hasNext());
     74     try {
     75       iterator.next();
     76       fail();
     77     } catch (NoSuchElementException expected) {
     78     }
     79     try {
     80       iterable.iterator();
     81       fail();
     82     } catch (IllegalStateException expected) {
     83     }
     84   }
     85 
     86   public void testFrom_one() {
     87     Iterable<String> iterable
     88         = MinimalIterable.from(Collections.singleton("a"));
     89     Iterator<String> iterator = iterable.iterator();
     90     assertTrue(iterator.hasNext());
     91     assertEquals("a", iterator.next());
     92     try {
     93       iterator.remove();
     94       fail();
     95     } catch (UnsupportedOperationException expected) {
     96     }
     97     assertFalse(iterator.hasNext());
     98     try {
     99       iterator.next();
    100       fail();
    101     } catch (NoSuchElementException expected) {
    102     }
    103     try {
    104       iterable.iterator();
    105       fail();
    106     } catch (IllegalStateException expected) {
    107     }
    108   }
    109 }
    110