dcevm/dcevm/src/test/java8/com/github/dcevm/test/lambdas/LambdaTest.java

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package com.github.dcevm.test.lambdas;

import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;

import java.util.concurrent.Callable;

import static com.github.dcevm.test.util.HotSwapTestHelper.__toVersion__;
import static com.github.dcevm.test.util.HotSwapTestHelper.__version__;
import static org.junit.Assert.assertEquals;

/**
 * Tests for lambda expressions.
 *
 * These lambdas are sneaky. First, it seems like generated lambda method names are arbitrary and depend
 * on the compilation order. However, for redefinition test we want to make sure that generated method names would
 * actually match in old and new versions, so we have keep classes being redefined outside of this inner class.
 *
 * @author Ivan Dubrov
 */
public class LambdaTest {

  @Before
  @After
  public void setUp() throws Exception {
    __toVersion__(0);
  }

  @Test
  public void testMethodLambda() throws Exception {
    LambdaA a = new LambdaA();
    Callable<Integer> lambda = a.createLambda();
    Callable<Integer> lambda2 = a.createLambda2();

    assertEquals(10, (int) lambda.call());
    assertEquals(20, (int) lambda2.call());

    __toVersion__(1, LambdaA___1.class);

    assertEquals(30, (int) lambda.call());
    assertEquals(40, (int) lambda2.call());
  }
}