/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed 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 io.reactivex.internal.operators.single;

import io.reactivex.Single;
import java.util.concurrent.Callable;
import org.junit.Test;

public class SingleFromCallableTest {
    @Test
    public void fromCallableValue() {
        Single.fromCallable(new Callable<Integer>() {
            @Override public Integer call() throws Exception {
                return 5;
            }
        })
            .test()
            .assertResult(5);
    }

    @Test
    public void fromCallableError() {
        Single.fromCallable(new Callable<Integer>() {
            @Override public Integer call() throws Exception {
                throw new UnsupportedOperationException();
            }
        })
            .test()
            .assertFailure(UnsupportedOperationException.class);
    }

    @Test
    public void fromCallableNull() {
        Single.fromCallable(new Callable<Integer>() {
            @Override public Integer call() throws Exception {
                return null;
            }
        })
            .test()
            .assertFailureAndMessage(NullPointerException.class, "The callable returned a null value");
    }
}
