3

我今天刚刚升级到 Robolectric 2.1.1 并集成了 Picasso。我现在有两个随机失败的测试用例（其中一个片段甚至不使用毕加索）。如果我继续运行测试，通常一切都会通过（可能需要几次尝试）。

测试

@Before
public void setUp() throws Exception
{
    detailActivity = Robolectric.buildActivity( ActivityUnderTest.class )
                                .withIntent( createIntent() )
                                .create()
                                .start()
                                .resume()
                                .get();

    // Note: The other test case doesn't use the fancy withIntent() doohickey
}

public static Intent createIntent()
{
    Bundle bundle = DetailFragment.createBundle( getTestData() );
    Intent intent = new Intent( new ActivityUnderTest(), Activity.class );
    intent.putExtras( bundle );
    return intent;
}

@Test
public void shouldNotBeNull() throws Exception
{
    assertNotNull( detailActivity );
}

编码器

我正在向活动发送一束信息，该活动基本上是一个空壳。该活动通过 XML 显示一个片段。在我的片段中，我使用getActivity().getIntent().getExtras().

说谎警告

[警告] 您正在直接实例化一个活动 (com.colabug.project.singlepanel.ActivityUnderTest)；考虑改用 Robolectric.buildActivity()。

堆栈跟踪

java.lang.RuntimeException: An unexpected exception occurred
at com.squareup.picasso.Request$1.run(Request.java:114)
at org.robolectric.util.Scheduler$PostedRunnable.run(Scheduler.java:162)
at org.robolectric.util.Scheduler.runOneTask(Scheduler.java:107)
at org.robolectric.util.Scheduler.advanceTo(Scheduler.java:92)
at org.robolectric.util.Scheduler.advanceToLastPostedRunnable(Scheduler.java:68)
at org.robolectric.util.Scheduler.unPause(Scheduler.java:25)
at org.robolectric.shadows.ShadowLooper.unPause(ShadowLooper.java:219)
at org.robolectric.shadows.ShadowLooper.runPaused(ShadowLooper.java:258)
at org.robolectric.util.ActivityController.invokeWhilePaused(ActivityController.java:202)
at org.robolectric.util.ActivityController.start(ActivityController.java:144)
at com.colabug.project.singlepanel.DetailActivityTest.setUp(DetailActivityTest.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:241)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:177)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:77)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.NullPointerException: Bitmap config was null.
at org.robolectric.shadows.ShadowBitmap.getBytesPerPixel(ShadowBitmap.java:338)
at org.robolectric.shadows.ShadowBitmap.getRowBytes(ShadowBitmap.java:225)
at org.robolectric.shadows.ShadowBitmap.getByteCount(ShadowBitmap.java:230)
at android.graphics.Bitmap.getByteCount(Bitmap.java)
at com.squareup.picasso.Utils$BitmapHoneycombMR1.getByteCount(Utils.java:250)
at com.squareup.picasso.Utils.getBitmapBytes(Utils.java:65)
at com.squareup.picasso.Stats.processBitmap(Stats.java:64)
at com.squareup.picasso.Stats.bitmapDecoded(Stats.java:40)
at com.squareup.picasso.Picasso.loadFromType(Picasso.java:365)
at com.squareup.picasso.Picasso.resolveRequest(Picasso.java:215)
at com.squareup.picasso.Picasso.run(Picasso.java:197)
at com.squareup.picasso.Request.run(Request.java:108)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:680)
at com.squareup.picasso.Utils$PicassoThread.run(Utils.java:244)

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project
    xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.colabug</groupId>
    <artifactId>Project</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>apk</packaging>
    <name>Project</name>

    <dependencies>
        <dependency>
            <groupId>com.google.android</groupId>
            <artifactId>android</artifactId>
            <version>2.2.1</version>
            <scope>provided</scope>
        </dependency>

        <!-- Make sure this is below the android dependencies -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.robolectric</groupId>
            <artifactId>robolectric</artifactId>
            <version>2.1.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.squareup.picasso</groupId>
            <artifactId>picasso</artifactId>
            <version>1.0.2</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}</finalName>

        <plugins>
            <plugin>
                <!-- See http://code.google.com/p/maven-android-plugin/ -->
                <groupId>com.jayway.maven.plugins.android.generation2</groupId>
                <artifactId>maven-android-plugin</artifactId>
                <version>2.8.3</version>
                <configuration>
                    <sdk>
                        <platform>17</platform>
                    </sdk>
                </configuration>
                <extensions>true</extensions>
            </plugin>
        </plugins>
    </build>
</project>

有任何想法吗？IntelliJ 可能是原因，因为它出现在堆栈跟踪中。我已经mvn clean在命令行上使用并手动清理了自动生成的文件，并在 IntelliJ 中重建了项目。

4

2 回答 2

3

德鲁是正确的。NPE 发生在后台线程中。

引起：java.lang.NullPointerException：位图配置为空。

从根本上说，这似乎是一个问题ShadowBitmap。但是我选择的解决方案是创建一个MockPicasso类。

存根实现可防止 NPE。它还具有防止单元测试首先通过网络请求位图的额外好处。

模拟毕加索.java

package com.squareup.picasso;

import android.graphics.Bitmap;
import android.widget.ImageView;

public class MockPicasso extends Picasso {
    private static String lastImagePath = null;
    private static ImageView lastTargetImageView = null;

    MockPicasso() {
        super(null, null, null, Cache.NONE, null, new MockStats());
    }

    public static void init() {
        singleton = new MockPicasso();
    }

    public static String getLastImagePath() {
        return lastImagePath;
    }

    public static ImageView getLastTargetImageView() {
        return lastTargetImageView;
    }

    @Override
    public RequestBuilder load(String path) {
        lastImagePath = path;
        return new MockRequestBuilder();
    }

    class MockRequestBuilder extends RequestBuilder {
        @Override
        public void into(ImageView target) {
            lastTargetImageView = target;
        }
    }

    static class MockStats extends Stats {
        MockStats() {
            super(Cache.NONE);
        }

        @Override
        void bitmapDecoded(Bitmap bitmap) {
            // Do nothing.
        }
    }
}

使用getLastImagePath()并且getLastTargetImageView()您可以测试您的代码正在请求正确的图像并将其加载到正确的视图中，而无需实际访问网络。

我的活动.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    ImageView avatar = (ImageView) findViewById(R.id.avatar);
    String path = getIntent().getStringExtra("avatar_url");
    Picasso.with(this).load(path).into(avatar);
}

MyActivityTest.java

@Test
public void shouldDisplayAvatar() throws Exception {
    MockPicasso.init();
    String imageUrl = "http://www.example.com/test.jpg";
    Intent intent = new Intent().putExtra("avatar_url", imageUrl);
    MyActivity myActivity = Robolectric.buildActivity(MyActivity.class)
            .create().get();

    myActivity.setIntent(intent);
    Robolectric.shadowOf(myActivity).callOnCreate(null);
    ImageView avatar = (ImageView) myActivity.findViewById(R.id.avatar);
    assertThat(MockPicasso.getLastImagePath()).isEqualTo(imageUrl);
    assertThat(MockPicasso.getLastTargetImageView()).isSameAs(avatar);
}
于 2013-06-21T18:25:23.470 回答
1

警告没有说谎。

Intent intent = new Intent(new ActivityUnderTest(), Activity.class);

“new ActivityUnderTest()”相当于“直接实例化一个活动”。

在许多测试似乎随机失败/通过的情况下，底层代码中存在线程问题。上一次发生在我身上的“有时会失败”测试实际上是在我的队列代码中暴露了一个竞争条件。

我发现当我有反应时“这个测试很愚蠢！” 我几乎发现测试实际上比我更聪明（也比我更好，因为它试图提供帮助）。

于 2013-06-13T21:18:17.453 回答