WebAssertion.java
/*
* Copyright (C) 2015 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.espresso.web.assertion;
import static com.google.common.base.Preconditions.checkNotNull;
import android.view.View;
import android.webkit.WebView;
import androidx.annotation.VisibleForTesting;
import androidx.test.espresso.NoMatchingViewException;
import androidx.test.espresso.ViewAssertion;
import androidx.test.espresso.remote.annotation.RemoteMsgConstructor;
import androidx.test.espresso.remote.annotation.RemoteMsgField;
import androidx.test.espresso.web.model.Atom;
/**
* Similar to a {@link ViewAssertion}, a {@link WebAssertion} allows users to check the results of
* an atom evaluated against the provided {@link WebView}.
*
* @param <E> The type the specific {@link Atom} returns.
*/
public abstract class WebAssertion<E> {
@RemoteMsgField(order = 0)
private final Atom<E> atom;
@RemoteMsgConstructor
public WebAssertion(Atom<E> atom) {
this.atom = checkNotNull(atom);
}
public final Atom<E> getAtom() {
return atom;
}
public final ViewAssertion toViewAssertion(final E result) {
return new CheckResultWebAssertion<>(checkNotNull(result), this);
}
/**
* Extension point to validate a view and atom result on the main thread.
*
* @param view the WebView that the Atom was evaluated on.
* @param result the result of atom evaluation.
*/
protected abstract void checkResult(WebView view, E result);
@VisibleForTesting
static final class CheckResultWebAssertion<T> implements ViewAssertion {
final T result;
final WebAssertion<T> webAssertion;
CheckResultWebAssertion(T result, WebAssertion<T> webAssertion) {
this.result = result;
this.webAssertion = webAssertion;
}
@Override
public void check(View view, NoMatchingViewException noViewFoundException) {
if (null == view) {
throw noViewFoundException;
} else if (!(view instanceof WebView)) {
throw new RuntimeException(view + ": is not a WebView!");
} else {
webAssertion.checkResult((WebView) view, result);
}
}
}
}