77f1b05fb0
Makes it easy to add or change values of resources from tests. Test: runtest --path frameworks/base/tests/testables/tests Change-Id: Iaedff3d4ce9eaf9f270e7c62bc8c1634bd3519ec
102 lines
3.6 KiB
Java
102 lines
3.6 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package android.testing;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.withSettings;
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import android.content.Context;
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import android.content.res.Resources;
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import android.util.Log;
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import android.util.SparseArray;
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import org.mockito.invocation.InvocationOnMock;
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/**
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* Provides a version of Resources that defaults to all existing resources, but can have ids
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* changed to return specific values.
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* <p>
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* TestableResources are lazily initialized, be sure to call
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* {@link TestableContext#ensureTestableResources} before your tested code has an opportunity
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* to cache {@link Context#getResources}.
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* </p>
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*/
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public class TestableResources {
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private static final String TAG = "TestableResources";
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private final Resources mResources;
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private final SparseArray<Object> mOverrides = new SparseArray<>();
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TestableResources(Resources realResources) {
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mResources = mock(Resources.class, withSettings()
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.spiedInstance(realResources)
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.defaultAnswer(this::answer));
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}
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/**
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* Gets the implementation of Resources that will return overridden values when called.
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*/
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public Resources getResources() {
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return mResources;
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}
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/**
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* Sets the return value for the specified resource id.
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* <p>
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* Since resource ids are unique there is a single addOverride that will override the value
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* whenever it is gotten regardless of which method is used (i.e. getColor or getDrawable).
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* </p>
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* @param id The resource id to be overridden
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* @param value The value of the resource, null to cause a {@link Resources.NotFoundException}
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* when gotten.
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*/
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public void addOverride(int id, Object value) {
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mOverrides.put(id, value);
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}
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/**
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* Removes the override for the specified id.
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* <p>
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* This should be called over addOverride(id, null), because specifying a null value will
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* cause a {@link Resources.NotFoundException} whereas removing the override will actually
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* switch back to returning the default/real value of the resource.
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* </p>
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* @param id
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*/
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public void removeOverride(int id) {
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mOverrides.remove(id);
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}
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private Object answer(InvocationOnMock invocationOnMock) throws Throwable {
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try {
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int id = invocationOnMock.getArgument(0);
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int index = mOverrides.indexOfKey(id);
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if (index >= 0) {
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Object value = mOverrides.valueAt(index);
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if (value == null) throw new Resources.NotFoundException();
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return value;
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}
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} catch (Resources.NotFoundException e) {
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// Let through NotFoundException.
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throw e;
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} catch (Throwable t) {
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// Generic catching for the many things that can go wrong, fall back to
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// the real implementation.
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Log.i(TAG, "Falling back to default resources call " + t);
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}
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return invocationOnMock.callRealMethod();
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}
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}
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