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      1 /*
      2  * Copyright (C) 2011 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.caliper.memory;
     18 
     19 import com.google.caliper.memory.ObjectGraphMeasurer.Footprint;
     20 import com.google.common.collect.ImmutableMultiset;
     21 
     22 import junit.framework.TestCase;
     23 
     24 import org.junit.Test;
     25 import org.junit.runner.RunWith;
     26 import org.junit.runners.JUnit4;
     27 
     28 /**
     29  * Tests for ObjectGraphMeasurer.
     30  */
     31 @RunWith(JUnit4.class)
     32 public class ObjectGraphMeasurerTest extends TestCase {
     33   enum DummyEnum {
     34     VALUE;
     35   }
     36   static final Object oneEnumField = new Object() {
     37     @SuppressWarnings("unused") DummyEnum enumField = DummyEnum.VALUE;
     38   };
     39 
     40   // enums are treated as statics (and ignored)
     41   @Test public void testEnum() {
     42     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(oneEnumField);
     43     assertEquals(new Footprint(1, 1, 0, NO_PRIMITIVES), footprint);
     44   }
     45 
     46   static final Object oneClassField = new Object() {
     47     @SuppressWarnings("unused") Class<?> clazz = Object.class;
     48   };
     49 
     50   // Class instances are treated as statics (and ignored)
     51   @Test public void testClass() {
     52     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(oneClassField);
     53     assertEquals(new ObjectGraphMeasurer.Footprint(1, 1, 0, NO_PRIMITIVES), footprint);
     54   }
     55 
     56   static final Object oneObjectField = new Object() {
     57     @SuppressWarnings("unused") Object objectField = new Object();
     58   };
     59 
     60   @Test public void testObject() {
     61     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(oneObjectField);
     62     assertEquals(new ObjectGraphMeasurer.Footprint(2, 1, 0, NO_PRIMITIVES), footprint);
     63   }
     64 
     65   static final Object withCycle = new Object() {
     66     Object[] array = new Object[1];
     67     {
     68       array[0] = this;
     69     }
     70   };
     71 
     72   @Test public void testCycle() {
     73     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(withCycle);
     74     assertEquals(new ObjectGraphMeasurer.Footprint(2, 2, 0, NO_PRIMITIVES), footprint);
     75   }
     76 
     77   static final Object multiplePathsToObject = new Object() {
     78     Object object = new Object();
     79     @SuppressWarnings("unused") Object ref1 = object;
     80     @SuppressWarnings("unused") Object ref2 = object;
     81   };
     82 
     83   @Test public void testMultiplePathsToObject() {
     84     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(multiplePathsToObject);
     85     assertEquals(new ObjectGraphMeasurer.Footprint(2, 3, 0, NO_PRIMITIVES), footprint);
     86   }
     87 
     88   static final Object multiplePathsToClass = new Object() {
     89     Object object = Object.class;
     90     @SuppressWarnings("unused") Object ref1 = object;
     91     @SuppressWarnings("unused") Object ref2 = object;
     92   };
     93 
     94   @Test public void testMultiplePathsToClass() {
     95     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(multiplePathsToClass);
     96     assertEquals(new ObjectGraphMeasurer.Footprint(1, 3, 0, NO_PRIMITIVES), footprint);
     97   }
     98 
     99   static class WithStaticField {
    100     static WithStaticField INSTANCE = new WithStaticField();
    101   }
    102 
    103   @Test public void testStaticFields() {
    104     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(new WithStaticField());
    105     assertEquals(new ObjectGraphMeasurer.Footprint(1, 0, 0, NO_PRIMITIVES), footprint);
    106   }
    107 
    108   @SuppressWarnings("unused") // unused test fields
    109   static final Object oneNullOneNonNull = new Object() {
    110     Object nonNull1 = new Object();
    111     Object nonNull2 = nonNull1;
    112     Object null1 = null;
    113     Object null2 = null;
    114     Object null3 = null;
    115   };
    116 
    117   @Test public void testNullField() {
    118     ObjectGraphMeasurer.Footprint footprint = ObjectGraphMeasurer.measure(oneNullOneNonNull);
    119     assertEquals(new ObjectGraphMeasurer.Footprint(2, 2, 3, NO_PRIMITIVES), footprint);
    120   }
    121 
    122   private static final ImmutableMultiset<Class<?>> NO_PRIMITIVES = ImmutableMultiset.of();
    123 }
    124