/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.pekko.util;

import org.apache.pekko.japi.function.Function;
import org.junit.Assert;
import org.junit.Test;

public class ConstantFunJavaTest {
  @Test
  public void alwaysReturnSameValue() {
    final Object value = new Object();
    final Function<Object, Object> fun = ConstantFun.javaIdentityFunction();
    try {
      Assert.assertTrue(fun.apply(value) == value);
    } catch (Exception e) {
      Assert.fail("Exception thrown: " + e.getMessage());
    }
  }

  @Test
  public void alwaysReturnFunctionInstance() {
    final Function<Object, Object> funObj = ConstantFun.javaIdentityFunction();
    final Function<String, String> funStr = ConstantFun.javaIdentityFunction();
    try {
      Assert.assertTrue(funObj.equals(funStr));
    } catch (Exception e) {
      Assert.fail("Exception thrown: " + e.getMessage());
    }
  }
}
