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Copy pathJacksonIteratorTest.java
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188 lines (161 loc) · 5.91 KB
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/**
* Copyright 2012-2020 The Feign 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 feign.jackson;
import com.fasterxml.jackson.databind.ObjectMapper;
import feign.Request;
import feign.Request.HttpMethod;
import feign.Response;
import feign.Util;
import feign.codec.DecodeException;
import feign.jackson.JacksonIteratorDecoder.JacksonIterator;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.NoSuchElementException;
import java.util.concurrent.atomic.AtomicBoolean;
import static feign.Util.UTF_8;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.hamcrest.core.Is.isA;
@SuppressWarnings("deprecation")
public class JacksonIteratorTest {
@Rule
public final ExpectedException thrown = ExpectedException.none();
@Test
public void shouldDecodePrimitiveArrays() throws IOException {
assertThat(iterator(Integer.class, "[0,1,2,3]")).containsExactly(0, 1, 2, 3);
}
@Test
public void shouldNotSkipElementsOnHasNext() throws IOException {
JacksonIterator<Integer> iterator = iterator(Integer.class, "[0]");
assertThat(iterator.hasNext()).isTrue();
assertThat(iterator.hasNext()).isTrue();
assertThat(iterator.next()).isEqualTo(0);
assertThat(iterator.hasNext()).isFalse();
}
@Test
public void hasNextIsNotMandatory() throws IOException {
JacksonIterator<Integer> iterator = iterator(Integer.class, "[0]");
assertThat(iterator.next()).isEqualTo(0);
assertThat(iterator.hasNext()).isFalse();
}
@Test
public void expectExceptionOnNoElements() throws IOException {
JacksonIterator<Integer> iterator = iterator(Integer.class, "[0]");
assertThat(iterator.next()).isEqualTo(0);
assertThatThrownBy(() -> iterator.next())
.hasMessage(null)
.isInstanceOf(NoSuchElementException.class);
}
@Test
public void shouldDecodeObjects() throws IOException {
assertThat(iterator(User.class, "[{\"login\":\"bob\"},{\"login\":\"joe\"}]"))
.containsExactly(new User("bob"), new User("joe"));
}
@Test
public void malformedObjectThrowsDecodeException() throws IOException {
thrown.expect(DecodeException.class);
thrown.expectCause(isA(IOException.class));
assertThat(iterator(User.class, "[{\"login\":\"bob\"},{\"login\":\"joe..."))
.containsOnly(new User("bob"));
}
@Test
public void emptyBodyDecodesToEmptyIterator() throws IOException {
assertThat(iterator(String.class, "")).isEmpty();
}
@Test
public void unmodifiable() throws IOException {
thrown.expect(UnsupportedOperationException.class);
JacksonIterator<String> it = iterator(String.class, "[\"test\"]");
assertThat(it).containsExactly("test");
it.remove();
}
@Test
public void responseIsClosedAfterIteration() throws IOException {
final AtomicBoolean closed = new AtomicBoolean();
byte[] jsonBytes = "[false, true]".getBytes(UTF_8);
InputStream inputStream = new ByteArrayInputStream(jsonBytes) {
@Override
public void close() throws IOException {
closed.set(true);
super.close();
}
};
Response response = Response.builder()
.status(200)
.reason("OK")
.request(
Request.create(HttpMethod.GET, "/api", Collections.emptyMap(), null, Util.UTF_8, null))
.headers(Collections.emptyMap())
.body(inputStream, jsonBytes.length)
.build();
assertThat(iterator(Boolean.class, response)).hasSize(2);
assertThat(closed.get()).isTrue();
}
@Test
public void responseIsClosedOnParseError() throws IOException {
final AtomicBoolean closed = new AtomicBoolean();
byte[] jsonBytes = "[error".getBytes(UTF_8);
InputStream inputStream = new ByteArrayInputStream(jsonBytes) {
@Override
public void close() throws IOException {
closed.set(true);
super.close();
}
};
Response response = Response.builder()
.status(200)
.reason("OK")
.request(
Request.create(HttpMethod.GET, "/api", Collections.emptyMap(), null, Util.UTF_8, null))
.headers(Collections.emptyMap())
.body(inputStream, jsonBytes.length)
.build();
try {
thrown.expect(DecodeException.class);
assertThat(iterator(Boolean.class, response)).hasSize(1);
} finally {
assertThat(closed.get()).isTrue();
}
}
static class User extends LinkedHashMap<String, Object> {
private static final long serialVersionUID = 1L;
User() {
// for reflective instantiation.
}
User(String login) {
put("login", login);
}
}
<T> JacksonIterator<T> iterator(Class<T> type, String json) throws IOException {
Response response = Response.builder()
.status(200)
.reason("OK")
.request(
Request.create(HttpMethod.GET, "/api", Collections.emptyMap(), null, Util.UTF_8, null))
.headers(Collections.emptyMap())
.body(json, UTF_8)
.build();
return iterator(type, response);
}
<T> JacksonIterator<T> iterator(Class<T> type, Response response) throws IOException {
return new JacksonIterator<T>(type.getGenericSuperclass(), new ObjectMapper(),
response, response.body().asReader(Util.UTF_8));
}
}