gson-comments/gson/src/test/java/com/google/gson/GsonBuilderTest.java

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/*
* Copyright (C) 2008 Google 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 com.google.gson;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
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import junit.framework.TestCase;
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import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
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/**
* Unit tests for {@link GsonBuilder}.
*
* @author Inderjeet Singh
*/
public class GsonBuilderTest extends TestCase {
private static final TypeAdapter<Object> NULL_TYPE_ADAPTER = new TypeAdapter<Object>() {
@Override public void write(JsonWriter out, Object value) {
throw new AssertionError();
}
@Override public Object read(JsonReader in) {
throw new AssertionError();
}
};
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public void testCreatingMoreThanOnce() {
GsonBuilder builder = new GsonBuilder();
builder.create();
builder.create();
}
public void testExcludeFieldsWithModifiers() {
Gson gson = new GsonBuilder()
.excludeFieldsWithModifiers(Modifier.VOLATILE, Modifier.PRIVATE)
.create();
assertEquals("{\"d\":\"d\"}", gson.toJson(new HasModifiers()));
}
public void testRegisterTypeAdapterForCoreType() {
Type[] types = {
byte.class,
int.class,
double.class,
Short.class,
Long.class,
String.class,
};
for (Type type : types) {
new GsonBuilder().registerTypeAdapter(type, NULL_TYPE_ADAPTER);
}
}
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@SuppressWarnings("unused")
static class HasModifiers {
private String a = "a";
volatile String b = "b";
private volatile String c = "c";
String d = "d";
}
public void testTransientFieldExclusion() {
Gson gson = new GsonBuilder()
.excludeFieldsWithModifiers()
.create();
assertEquals("{\"a\":\"a\"}", gson.toJson(new HasTransients()));
}
static class HasTransients {
transient String a = "a";
}
public void testDisableJdkUnsafe() {
Gson gson = new GsonBuilder()
.disableJdkUnsafe()
.create();
try {
gson.fromJson("{}", ClassWithoutNoArgsConstructor.class);
fail("Expected exception");
} catch (JsonIOException expected) {
assertEquals(
"Unable to create instance of class com.google.gson.GsonBuilderTest$ClassWithoutNoArgsConstructor; "
+ "usage of JDK Unsafe is disabled. Registering an InstanceCreator or a TypeAdapter for this type, "
+ "adding a no-args constructor, or enabling usage of JDK Unsafe may fix this problem.",
expected.getMessage()
);
}
}
private static class ClassWithoutNoArgsConstructor {
@SuppressWarnings("unused")
public ClassWithoutNoArgsConstructor(String s) {
}
}
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}