/*
    * 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
    *
    *      https://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.commons.io.function;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link IOSupplier}.
   */
  class IOSupplierTest {
  
      private AtomicReference<String> ref1;
  
      private String getThrowsIO(final IOSupplier<String> supplier) throws IOException {
          return supplier.get();
      }
  
      private String getThrowsNoneAsSupplier(final IOSupplier<String> supplier) {
          return supplier.asSupplier().get();
      }
  
      private String getThrowsNoneGetUnchecked(final IOSupplier<String> supplier) {
          return supplier.getUnchecked();
      }
  
      @BeforeEach
      public void initEach() {
          ref1 = new AtomicReference<>();
      }
  
      @Test
      void testAsSupplier() {
          assertThrows(UncheckedIOException.class, () -> TestConstants.THROWING_IO_SUPPLIER.asSupplier().get());
          final String s1 = "string1";
          final String s2 = "string2";
          assertEquals(s1, getThrowsNoneAsSupplier(() -> TestUtils.compareAndSetThrowsIO(ref1, null, s1)));
          assertEquals(s1, ref1.get());
          assertEquals(s2, getThrowsNoneAsSupplier(() -> TestUtils.compareAndSetThrowsIO(ref1, s1, s2)));
          assertEquals(s2, ref1.get());
          assertNotEquals(TestConstants.THROWING_IO_SUPPLIER.asSupplier(), TestConstants.THROWING_IO_SUPPLIER.asSupplier());
      }
  
      @Test
      void testGet() throws IOException {
          assertThrows(IOException.class, () -> TestConstants.THROWING_IO_SUPPLIER.get());
          assertThrows(IOException.class, () -> {
              throw new IOException();
          });
          assertEquals("new1", getThrowsIO(() -> TestUtils.compareAndSetThrowsIO(ref1, "new1")));
          assertEquals("new1", ref1.get());
      }
  
      @Test
      void testGetUnchecked() {
          assertThrows(UncheckedIOException.class, () -> TestConstants.THROWING_IO_SUPPLIER.asSupplier().get());
          final String s1 = "string1";
          final String s2 = "string2";
          assertEquals(s1, getThrowsNoneGetUnchecked(() -> TestUtils.compareAndSetThrowsIO(ref1, null, s1)));
          assertEquals(s1, ref1.get());
          assertEquals(s2, getThrowsNoneGetUnchecked(() -> TestUtils.compareAndSetThrowsIO(ref1, s1, s2)));
          assertEquals(s2, ref1.get());
          assertNotEquals(TestConstants.THROWING_IO_SUPPLIER.asSupplier(), TestConstants.THROWING_IO_SUPPLIER.asSupplier());
      }
  
  }