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/*
* Copyright (C) 2018 Gson 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 com.google.gson.functional;
import java.io.IOException;
import java.util.regex.Pattern;
import org.junit.Before;
import org.junit.Test;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import junit.framework.TestCase;
/**
* Functional tests to validate printing of Gson version on AssertionErrors
*
* @author Inderjeet Singh
*/
public class GsonVersionDiagnosticsTest extends TestCase {
private static final Pattern GSON_VERSION_PATTERN = Pattern.compile("(\\(GSON \\d\\.\\d+(\\.\\d)?)(?:[-.][A-Z]+)?\\)$");
private Gson gson;
@Before
@Override
public void setUp() {
gson = new GsonBuilder().registerTypeAdapter(TestType.class, new TypeAdapter<TestType>() {
@Override public void write(JsonWriter out, TestType value) {
throw new AssertionError("Expected during serialization");
}
@Override public TestType read(JsonReader in) throws IOException {
throw new AssertionError("Expected during deserialization");
}
}).create();
}
@Test
public void testVersionPattern() {
assertTrue(GSON_VERSION_PATTERN.matcher("(GSON 2.8.5)").matches());
assertTrue(GSON_VERSION_PATTERN.matcher("(GSON 2.8.5-SNAPSHOT)").matches());
}
@Test
public void testAssertionErrorInSerializationPrintsVersion() {
try {
gson.toJson(new TestType());
fail();
} catch (AssertionError expected) {
ensureAssertionErrorPrintsGsonVersion(expected);
}
}
@Test
public void testAssertionErrorInDeserializationPrintsVersion() {
try {
gson.fromJson("{'a':'abc'}", TestType.class);
fail();
} catch (AssertionError expected) {
ensureAssertionErrorPrintsGsonVersion(expected);
}
}
private void ensureAssertionErrorPrintsGsonVersion(AssertionError expected) {
String msg = expected.getMessage();
// System.err.println(msg);
int start = msg.indexOf("(GSON");
assertTrue(start > 0);
int end = msg.indexOf("):") + 1;
assertTrue(end > 0 && end > start + 6);
String version = msg.substring(start, end);
// System.err.println(version);
assertTrue(GSON_VERSION_PATTERN.matcher(version).matches());
}
private static final class TestType {
@SuppressWarnings("unused")
String a;
}
}
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