package com.atlassian.asap.core.server.jersey;
   
   import org.junit.Test;
   
   import java.util.List;
   import java.util.function.Function;
   
   import static com.atlassian.asap.core.server.jersey.Memoizer.memoize;
   import static com.google.common.collect.Lists.newArrayList;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  
  public class MemoizerTest {
      @Test
      public void memoizeCalledOnce() {
          List<String> data = newArrayList();
          Function<String, Boolean> counter = memoize(data::add);
  
          assertThat(counter.apply("foo"), equalTo(true));
          assertThat(data.size(), equalTo(1));
  
          assertThat(counter.apply("foo"), equalTo(true));
          assertThat(data.size(), equalTo(1));
      }
  }