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      1 /*
      2  * Copyright (C) 2009 Google Inc.
      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;
     18 
     19 import com.google.common.testing.EqualsTester;
     20 
     21 /**
     22  * Tests {@link EmptyImmutableTable}
     23  *
     24  * @author gak (at) google.com (Gregory Kick)
     25  */
     26 public class EmptyImmutableTableTest extends AbstractImmutableTableTest {
     27   private static final ImmutableTable<Character, Integer, String> INSTANCE =
     28       ImmutableTable.of();
     29 
     30   @Override Iterable<ImmutableTable<Character, Integer, String>>
     31       getTestInstances() {
     32     return ImmutableSet.of(INSTANCE);
     33   }
     34 
     35   public void testHashCode() {
     36     assertEquals(0, INSTANCE.hashCode());
     37   }
     38 
     39   public void testEqualsObject() {
     40     new EqualsTester()
     41         .addEqualityGroup(INSTANCE, HashBasedTable.create(),
     42             TreeBasedTable.create())
     43         .addEqualityGroup(ArrayTable.create(ImmutableSet.of("A"),
     44             ImmutableSet.of(1)))
     45         .testEquals();
     46   }
     47 
     48   public void testToString() {
     49     assertEquals("{}", INSTANCE.toString());
     50   }
     51 
     52   public void testSize() {
     53     assertEquals(0, INSTANCE.size());
     54   }
     55 
     56   public void testGet() {
     57     assertNull(INSTANCE.get('a', 1));
     58   }
     59 
     60   public void testIsEmpty() {
     61     assertTrue(INSTANCE.isEmpty());
     62   }
     63 
     64   public void testCellSet() {
     65     assertEquals(ImmutableSet.of(), INSTANCE.cellSet());
     66   }
     67 
     68   public void testColumn() {
     69     assertEquals(ImmutableMap.of(), INSTANCE.column(1));
     70   }
     71 
     72   public void testColumnKeySet() {
     73     assertEquals(ImmutableSet.of(), INSTANCE.columnKeySet());
     74   }
     75 
     76   public void testColumnMap() {
     77     assertEquals(ImmutableMap.of(), INSTANCE.columnMap());
     78   }
     79 
     80   public void testContains() {
     81     assertFalse(INSTANCE.contains('a', 1));
     82   }
     83 
     84   public void testContainsColumn() {
     85     assertFalse(INSTANCE.containsColumn(1));
     86   }
     87 
     88   public void testContainsRow() {
     89     assertFalse(INSTANCE.containsRow('a'));
     90   }
     91 
     92   public void testContainsValue() {
     93     assertFalse(INSTANCE.containsValue("blah"));
     94   }
     95 
     96   public void testRow() {
     97     assertEquals(ImmutableMap.of(), INSTANCE.row('a'));
     98   }
     99 
    100   public void testRowKeySet() {
    101     assertEquals(ImmutableSet.of(), INSTANCE.rowKeySet());
    102   }
    103 
    104   public void testRowMap() {
    105     assertEquals(ImmutableMap.of(), INSTANCE.rowMap());
    106   }
    107 
    108   public void testValues() {
    109     assertTrue(INSTANCE.values().isEmpty());
    110   }
    111 
    112   public void testReadResolve() {
    113     assertSame(EmptyImmutableTable.INSTANCE,
    114         EmptyImmutableTable.INSTANCE.readResolve());
    115   }
    116 
    117 }
    118