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 testOf_empty()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 testOf_one()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 testFrom_empty()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 testFrom_one()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