ParcelableSubject.java
/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 androidx.test.ext.truth.os;
import static androidx.test.core.os.Parcelables.forceParcel;
import static com.google.common.truth.Fact.fact;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.Parcelable.Creator;
import com.google.common.truth.FailureMetadata;
import com.google.common.truth.Subject;
import com.google.common.truth.Truth;
import java.util.Arrays;
/** Testing subject for {@link Parcelable}s. */
public final class ParcelableSubject<T extends Parcelable> extends Subject {
public static <T extends Parcelable> ParcelableSubject<T> assertThat(T parcelable) {
return Truth.assertAbout(ParcelableSubject.<T>parcelables()).that(parcelable);
}
public static <T extends Parcelable> Subject.Factory<ParcelableSubject<T>, T> parcelables() {
return ParcelableSubject<T>::new;
}
private final T actual;
ParcelableSubject(FailureMetadata failureMetadata, T subject) {
super(failureMetadata, subject);
this.actual = subject;
}
/**
* Asserts that the subject is equal to itself after it goes through marshall/unmarshall cycle.
*/
public void recreatesEqual(Creator<T> creator) {
T recreated = forceParcel(actual, creator);
check("recreatesEqual()").that(actual).isEqualTo(recreated);
}
/** Asserts that the subject serializes to the same bytes as some other one. */
public void marshallsEquallyTo(Parcelable other) {
Parcel parcel = Parcel.obtain();
try {
actual.writeToParcel(parcel, 0);
byte[] actualBytes = parcel.marshall();
parcel.setDataPosition(0);
other.writeToParcel(parcel, 0);
byte[] otherBytes = parcel.marshall();
if (!Arrays.equals(actualBytes, otherBytes)) {
failWithActual(fact("expected to serialize like", other));
}
} finally {
parcel.recycle();
}
}
}