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UtilTest.java
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134 lines (113 loc) · 4.89 KB
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/*
* Copyright 2013 Netflix, Inc.
*
* 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 feign;
import org.junit.Test;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import feign.codec.Decoder;
import static feign.Util.resolveLastTypeParameter;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
public class UtilTest {
@Test
public void emptyValueOf() throws Exception {
assertEquals(false, Util.emptyValueOf(boolean.class));
assertEquals(false, Util.emptyValueOf(Boolean.class));
assertThat((byte[]) Util.emptyValueOf(byte[].class)).isEmpty();
assertEquals(Collections.emptyList(), Util.emptyValueOf(Collection.class));
assertThat((Iterator<?>) Util.emptyValueOf(Iterator.class)).isEmpty();
assertEquals(Collections.emptyList(), Util.emptyValueOf(List.class));
assertEquals(Collections.emptyMap(), Util.emptyValueOf(Map.class));
assertEquals(Collections.emptySet(), Util.emptyValueOf(Set.class));
}
/** In other words, {@code List<String>} is as empty as {@code List<?>}. */
@Test
public void emptyValueOf_considersRawType() throws Exception {
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
assertThat((List<?>) Util.emptyValueOf(listStringType)).isEmpty();
}
/** Ex. your {@code Foo} object would be null, but so would things like Number. */
@Test
public void emptyValueOf_nullForUndefined() throws Exception {
assertThat(Util.emptyValueOf(Number.class)).isNull();
assertThat(Util.emptyValueOf(Parameterized.class)).isNull();
}
@Test
public void resolveLastTypeParameterWhenNotSubtype() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_LIST_STRING").getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Parameterized.class);
assertEquals(listStringType, last);
}
@Test
public void lastTypeFromInstance() throws Exception {
Parameterized<?> instance = new ParameterizedSubtype();
Type last = resolveLastTypeParameter(instance.getClass(), Parameterized.class);
assertEquals(String.class, last);
}
@Test
public void lastTypeFromAnonymous() throws Exception {
Parameterized<?> instance = new Parameterized<Reader>() {
};
Type last = resolveLastTypeParameter(instance.getClass(), Parameterized.class);
assertEquals(Reader.class, last);
}
@Test
public void resolveLastTypeParameterWhenWildcard() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_WILDCARD_LIST_STRING")
.getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Parameterized.class);
assertEquals(listStringType, last);
}
@Test
public void resolveLastTypeParameterWhenParameterizedSubtype() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_LIST_STRING")
.getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(listStringType, last);
}
@Test
public void unboundWildcardIsObject() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_UNBOUND").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(Object.class, last);
}
interface LastTypeParameter {
final List<String> LIST_STRING = null;
final Parameterized<List<String>> PARAMETERIZED_LIST_STRING = null;
final Parameterized<? extends List<String>> PARAMETERIZED_WILDCARD_LIST_STRING = null;
final ParameterizedDecoder<List<String>> PARAMETERIZED_DECODER_LIST_STRING = null;
final ParameterizedDecoder<?> PARAMETERIZED_DECODER_UNBOUND = null;
}
interface ParameterizedDecoder<T extends List<String>> extends Decoder {
}
interface Parameterized<T> {
}
static class ParameterizedSubtype implements Parameterized<String> {
}
}