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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.inject;
import static com.google.inject.internal.InternalFlags.IncludeStackTraceOption;
import static com.google.inject.internal.InternalFlags.getIncludeStackTraceOption;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNotNull;
import static junit.framework.Assert.assertTrue;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import junit.framework.Assert;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.NotSerializableException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* @author jessewilson@google.com (Jesse Wilson)
*/
public class Asserts {
private Asserts() {}
/**
* Returns the String that would appear in an error message for this chain of classes
* as modules.
*/
public static String asModuleChain(Class... classes) {
return Joiner.on(" -> ").appendTo(new StringBuilder(" (via modules: "),
Iterables.transform(ImmutableList.copyOf(classes), new Function<Class, String>() {
@Override
public String apply(Class input) {
return input.getName();
}
})).append(")").toString();
}
/**
* Returns the source file appears in error messages based on {@link
* #getIncludeStackTraceOption()} value.
*/
public static String getDeclaringSourcePart(Class clazz) {
if (getIncludeStackTraceOption() == IncludeStackTraceOption.OFF) {
return ".configure(Unknown Source";
}
return ".configure(" + clazz.getSimpleName() + ".java:";
}
/**
* Returns true if {@link #getIncludeStackTraceOption()} returns {@link
* IncludeStackTraceOption#OFF}.
*/
public static boolean isIncludeStackTraceOff() {
return getIncludeStackTraceOption() == IncludeStackTraceOption.OFF;
}
/**
* Returns true if {@link #getIncludeStackTraceOption()} returns {@link
* IncludeStackTraceOption#COMPLETE}.
*/
public static boolean isIncludeStackTraceComplete() {
return getIncludeStackTraceOption() == IncludeStackTraceOption.COMPLETE;
}
/**
* Fails unless {@code expected.equals(actual)}, {@code
* actual.equals(expected)} and their hash codes are equal. This is useful
* for testing the equals method itself.
*/
public static void assertEqualsBothWays(Object expected, Object actual) {
assertNotNull(expected);
assertNotNull(actual);
assertEquals("expected.equals(actual)", actual, expected);
assertEquals("actual.equals(expected)", expected, actual);
assertEquals("hashCode", expected.hashCode(), actual.hashCode());
}
/**
* Fails unless {@code text} includes all {@code substrings}, in order.
*/
public static void assertContains(String text, String... substrings) {
/*if[NO_AOP]
// when we strip out bytecode manipulation, we lose the ability to generate some source lines.
if (text.contains("(Unknown Source)")) {
return;
}
end[NO_AOP]*/
int startingFrom = 0;
for (String substring : substrings) {
int index = text.indexOf(substring, startingFrom);
assertTrue(String.format("Expected \"%s\" to contain substring \"%s\"", text, substring),
index >= startingFrom);
startingFrom = index + substring.length();
}
String lastSubstring = substrings[substrings.length - 1];
assertTrue(String.format("Expected \"%s\" to contain substring \"%s\" only once),",
text, lastSubstring), text.indexOf(lastSubstring, startingFrom) == -1);
}
/**
* Fails unless {@code object} doesn't equal itself when reserialized.
*/
public static void assertEqualWhenReserialized(Object object)
throws IOException {
Object reserialized = reserialize(object);
assertEquals(object, reserialized);
assertEquals(object.hashCode(), reserialized.hashCode());
}
/**
* Fails unless {@code object} has the same toString value when reserialized.
*/
public static void assertSimilarWhenReserialized(Object object) throws IOException {
Object reserialized = reserialize(object);
assertEquals(object.toString(), reserialized.toString());
}
public static <E> E reserialize(E original) throws IOException {
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
new ObjectOutputStream(out).writeObject(original);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
@SuppressWarnings("unchecked") // the reserialized type is assignable
E reserialized = (E) new ObjectInputStream(in).readObject();
return reserialized;
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
public static void assertNotSerializable(Object object) throws IOException {
try {
reserialize(object);
Assert.fail();
} catch (NotSerializableException expected) {
}
}
}
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