Ec2MetadataRegionProviderTest.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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 org.springframework.cloud.aws.core.region;

import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import static org.junit.Assert.assertEquals;

/**
 * @author Agim Emruli
 */
public class Ec2MetadataRegionProviderTest {

    @Rule
    public final ExpectedException expectedException = ExpectedException.none();

    @Test
    public void getRegion_availabilityZoneWithMatchingRegion_returnsRegion() throws Exception {
        //Arrange
        Ec2MetadataRegionProvider regionProvider = new Ec2MetadataRegionProvider() {

            @Override
            protected Region getCurrentRegion() {
                return Region.getRegion(Regions.EU_WEST_1);
            }
        };

        //Act
        Region region = regionProvider.getRegion();

        //Assert
        assertEquals(Region.getRegion(Regions.EU_WEST_1), region);
    }

    @Test
    public void getRegion_noMetadataAvailable_throwsIllegalStateException() throws Exception {
        //Arrange
        this.expectedException.expect(IllegalStateException.class);
        this.expectedException.expectMessage("There is not EC2 meta data available, because the application is not running in the EC2 environment");

        Ec2MetadataRegionProvider regionProvider = new Ec2MetadataRegionProvider() {

            @Override
            protected Region getCurrentRegion() {
                return null;
            }
        };

        //Act
        regionProvider.getRegion();

        //Assert
    }
}