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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      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.android.compatibility.common.util;
     18 
     19 import static com.google.common.truth.Truth.assertThat;
     20 
     21 import static org.mockito.Mockito.doThrow;
     22 import static org.mockito.Mockito.times;
     23 import static org.mockito.Mockito.verify;
     24 import static org.testng.Assert.assertThrows;
     25 import static org.testng.Assert.expectThrows;
     26 
     27 import org.junit.Test;
     28 import org.junit.runner.Description;
     29 import org.junit.runner.RunWith;
     30 import org.junit.runners.model.Statement;
     31 import org.mockito.Mock;
     32 import org.mockito.junit.MockitoJUnitRunner;
     33 
     34 @RunWith(MockitoJUnitRunner.class)
     35 public class RetryRuleTest {
     36 
     37     private final Description mDescription = Description.createSuiteDescription("Whatever");
     38 
     39     private static final RetryableException sRetryableException =
     40             new RetryableException("Y U NO RETRY?");
     41 
     42     private static class RetryableStatement<T extends Exception> extends Statement {
     43         private final int mNumberFailures;
     44         private int mNumberCalls;
     45         private final T mException;
     46 
     47         RetryableStatement(int numberFailures, T exception) {
     48             mNumberFailures = numberFailures;
     49             mException = exception;
     50         }
     51 
     52         @Override
     53         public void evaluate() throws Throwable {
     54             mNumberCalls++;
     55             if (mNumberCalls <= mNumberFailures) {
     56                 throw mException;
     57             }
     58         }
     59 
     60         @Override
     61         public String toString() {
     62             return "RetryableStatement: failures=" + mNumberFailures + ", calls=" + mNumberCalls;
     63         }
     64     }
     65 
     66     private @Mock Statement mMockStatement;
     67 
     68     @Test
     69     public void testInvalidConstructor() throws Throwable {
     70         assertThrows(IllegalArgumentException.class, () -> new RetryRule(-1));
     71     }
     72 
     73     @Test
     74     public void testPassOnRetryableException() throws Throwable {
     75         final RetryRule rule = new RetryRule(1);
     76         rule.apply(new RetryableStatement<RetryableException>(1, sRetryableException), mDescription)
     77                 .evaluate();
     78     }
     79 
     80     @Test
     81     public void testPassOnRetryableExceptionWithTimeout() throws Throwable {
     82         final Timeout timeout = new Timeout("YOUR TIME IS GONE", 1, 2, 10);
     83         final RetryableException exception = new RetryableException(timeout, "Y U NO?");
     84 
     85         final RetryRule rule = new RetryRule(1);
     86         rule.apply(new RetryableStatement<RetryableException>(1, exception), mDescription)
     87                 .evaluate();
     88 
     89         // Assert timeout was increased
     90         assertThat(timeout.ms()).isEqualTo(2);
     91     }
     92 
     93     @Test
     94     public void testFailOnRetryableException() throws Throwable {
     95         final RetryRule rule = new RetryRule(1);
     96 
     97         final RetryableException actualException = expectThrows(RetryableException.class,
     98                 () -> rule.apply(new RetryableStatement<RetryableException>(2, sRetryableException),
     99                         mDescription).evaluate());
    100 
    101         assertThat(actualException).isSameAs(sRetryableException);
    102     }
    103 
    104     @Test
    105     public void testPassWhenDisabledAndStatementPass() throws Throwable {
    106         final RetryRule rule = new RetryRule(0);
    107 
    108         rule.apply(mMockStatement, mDescription).evaluate();
    109 
    110         verify(mMockStatement, times(1)).evaluate();
    111     }
    112 
    113     @Test
    114     public void testFailWhenDisabledAndStatementThrowsRetryableException() throws Throwable {
    115         final RetryableException exception = new RetryableException("Y U NO?");
    116         final RetryRule rule = new RetryRule(0);
    117         doThrow(exception).when(mMockStatement).evaluate();
    118 
    119         final RetryableException actualException = expectThrows(RetryableException.class,
    120                 () -> rule.apply(mMockStatement, mDescription).evaluate());
    121 
    122         assertThat(actualException).isSameAs(exception);
    123         verify(mMockStatement, times(1)).evaluate();
    124     }
    125 
    126     @Test
    127     public void testFailWhenDisabledAndStatementThrowsNonRetryableException() throws Throwable {
    128         final RuntimeException exception = new RuntimeException("Y U NO?");
    129         final RetryRule rule = new RetryRule(0);
    130         doThrow(exception).when(mMockStatement).evaluate();
    131 
    132         final RuntimeException actualException = expectThrows(RuntimeException.class,
    133                 () -> rule.apply(mMockStatement, mDescription).evaluate());
    134 
    135         assertThat(actualException).isSameAs(exception);
    136         verify(mMockStatement, times(1)).evaluate();
    137     }
    138 }
    139