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GsonModuleTest.java
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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.gson;
import com.google.gson.reflect.TypeToken;
import dagger.Module;
import dagger.ObjectGraph;
import feign.IncrementalCallback;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.codec.IncrementalDecoder;
import org.testng.annotations.Test;
import javax.inject.Inject;
import java.io.StringReader;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.fail;
@Test
public class GsonModuleTest {
@Module(includes = GsonModule.class, library = true, injects = EncodersAndDecoders.class)
static class EncodersAndDecoders {
@Inject Set<Encoder> encoders;
@Inject Set<Decoder> decoders;
@Inject Set<IncrementalDecoder> incrementalDecoders;
}
@Test public void providesEncoderDecoderAndIncrementalDecoder() throws Exception {
EncodersAndDecoders bindings = new EncodersAndDecoders();
ObjectGraph.create(bindings).inject(bindings);
assertEquals(bindings.encoders.size(), 1);
assertEquals(bindings.encoders.iterator().next().getClass(), GsonModule.GsonCodec.class);
assertEquals(bindings.decoders.size(), 1);
assertEquals(bindings.decoders.iterator().next().getClass(), GsonModule.GsonCodec.class);
assertEquals(bindings.incrementalDecoders.size(), 1);
assertEquals(bindings.incrementalDecoders.iterator().next().getClass(), GsonModule.GsonCodec.class);
}
@Module(includes = GsonModule.class, library = true, injects = Encoders.class)
static class Encoders {
@Inject Set<Encoder> encoders;
}
@Test public void encodesMapObjectNumericalValuesAsInteger() throws Exception {
Encoders bindings = new Encoders();
ObjectGraph.create(bindings).inject(bindings);
Map<String, Object> map = new LinkedHashMap<String, Object>();
map.put("foo", 1);
assertEquals(Encoder.Text.class.cast(bindings.encoders.iterator().next()).encode(map), ""//
+ "{\n" //
+ " \"foo\": 1\n" //
+ "}");
}
@Test public void encodesFormParams() throws Exception {
Encoders bindings = new Encoders();
ObjectGraph.create(bindings).inject(bindings);
Map<String, Object> form = new LinkedHashMap<String, Object>();
form.put("foo", 1);
form.put("bar", Arrays.asList(2, 3));
assertEquals(Encoder.Text.class.cast(bindings.encoders.iterator().next()).encode(form), ""//
+ "{\n" //
+ " \"foo\": 1,\n" //
+ " \"bar\": [\n" //
+ " 2,\n" //
+ " 3\n" //
+ " ]\n" //
+ "}");
}
static class Zone extends LinkedHashMap<String, Object> {
Zone() {
// for reflective instantiation.
}
Zone(String name) {
this(name, null);
}
Zone(String name, String id) {
put("name", name);
if (id != null)
put("id", id);
}
private static final long serialVersionUID = 1L;
}
@Module(includes = GsonModule.class, library = true, injects = Decoders.class)
static class Decoders {
@Inject Set<Decoder> decoders;
}
@Test public void decodes() throws Exception {
Decoders bindings = new Decoders();
ObjectGraph.create(bindings).inject(bindings);
List<Zone> zones = new LinkedList<Zone>();
zones.add(new Zone("denominator.io."));
zones.add(new Zone("denominator.io.", "ABCD"));
assertEquals(Decoder.TextStream.class.cast(bindings.decoders.iterator().next())
.decode(new StringReader(zonesJson), new TypeToken<List<Zone>>() {
}.getType()), zones);
}
@Module(includes = GsonModule.class, library = true, injects = IncrementalDecoders.class)
static class IncrementalDecoders {
@Inject Set<IncrementalDecoder> decoders;
}
@Test public void decodesIncrementally() throws Exception {
IncrementalDecoders bindings = new IncrementalDecoders();
ObjectGraph.create(bindings).inject(bindings);
final List<Zone> zones = new LinkedList<Zone>();
zones.add(new Zone("denominator.io."));
zones.add(new Zone("denominator.io.", "ABCD"));
final AtomicInteger index = new AtomicInteger(0);
IncrementalCallback<Zone> zoneCallback = new IncrementalCallback<Zone>() {
@Override public void onNext(Zone element) {
assertEquals(element, zones.get(index.getAndIncrement()));
}
@Override public void onSuccess() {
// decoder shouldn't call onSuccess
fail();
}
@Override public void onFailure(Throwable cause) {
// decoder shouldn't call onFailure
fail();
}
};
IncrementalDecoder.TextStream.class.cast(bindings.decoders.iterator().next())
.decode(new StringReader(zonesJson), Zone.class, zoneCallback);
assertEquals(index.get(), 2);
}
private String zonesJson = ""//
+ "[\n"//
+ " {\n"//
+ " \"name\": \"denominator.io.\"\n"//
+ " },\n"//
+ " {\n"//
+ " \"name\": \"denominator.io.\",\n"//
+ " \"id\": \"ABCD\"\n"//
+ " }\n"//
+ "]\n";
}