如何测试执行过程中访问从资产的文件夹中的文件？ [英] How to access files from assets folder during tests execution?
问题描述
如何单元测试执行过程中访问从资产的文件夹中的文件？我的项目是建设使用摇篮，我用Robolectric运行测试。好像摇篮是被承认的资产：
How to access files from assets folder during unit tests execution? My project is build using Gradle, I use Robolectric to run tests. It seems like gradle is being recognizing the assets:
这是我如何挣扎来读取文件：
This is how I'm struggling to read the file:
public String readFileFromAssets(String fileName) throws IOException {
InputStream stream = getClass().getClassLoader().getResourceAsStream("assets/" + fileName);
Preconditions.checkNotNull(stream, "Stream is null");
BufferedReader reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
return IOUtils.toString(reader);
}
但流总是空。我尝试了用不同的方法很多不同的方式，即定义文件路径。
But stream is always null. I tried it many different ways, i.e. defined path to a file using different approaches.
非常感谢你提前。
推荐答案
基本上，你必须使用上下文阅读资产。你不能用的ClassLoader ，因为它不是在类路径中加载资产。我不知道你是如何运行Robolectric测试用例。下面是我怎么能在这两个机器人工作室和gralde命令实现。
Basically you have to use Context to read assets. You can not load assets with ClassLoader since it is not in a classpath. I am not sure how you run Robolectric test cases. Here are how I can achieve in both Android studio and gralde command.
我添加单独的应用程序单元测试模块可以在应用程序项目中运行Robolectric测试用例。
通过适当的构建配置和定制 RobolectricTestRunner ，下面的测试情况将成为过去。
I added separate app-unit-test module to run Robolectric test cases in app project.
With proper build configuration and custom RobolectricTestRunner, following test case will pass.
@Config
@RunWith(MyRobolectricTestRunner.class)
public class ReadAssetsTest {
@Test
public void test_ToReadAssetsFileInAndroidTestContext() throws IOException {
ShadowApplication application = Robolectric.getShadowApplication();
Assert.assertNotNull(application);
InputStream input = application.getAssets().open("b.xml");
Assert.assertNotNull(input);
}
}
应用程序单元测试/ build.gradle
app-unit-test/build.gradle
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.14.1'
}
}
apply plugin: 'java'
evaluationDependsOn(':app')
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
repositories {
maven { url "$System.env.ANDROID_HOME/extras/android/m2repository" } // Fix 'com.android.support:*' package not found issue
mavenLocal()
mavenCentral()
jcenter()
}
dependencies {
testCompile 'junit:junit:4.8.2'
testCompile('org.robolectric:robolectric:2.4') {
exclude module: 'classworlds'
exclude module: 'commons-logging'
exclude module: 'httpclient'
exclude module: 'maven-artifact'
exclude module: 'maven-artifact-manager'
exclude module: 'maven-error-diagnostics'
exclude module: 'maven-model'
exclude module: 'maven-project'
exclude module: 'maven-settings'
exclude module: 'plexus-container-default'
exclude module: 'plexus-interpolation'
exclude module: 'plexus-utils'
exclude module: 'wagon-file'
exclude module: 'wagon-http-lightweight'
exclude module: 'wagon-provider-api'
exclude group: 'com.android.support', module: 'support-v4'
}
testCompile('com.squareup:fest-android:1.0.+') {
exclude group: 'com.android.support', module: 'support-v4'
}
testCompile 'org.mockito:mockito-core:1.10.10'
def appModule = project(':app')
testCompile(appModule) {
exclude group: 'com.google.android'
exclude module: 'dexmaker-mockito'
}
testCompile appModule.android.applicationVariants.toList().first().javaCompile.classpath
testCompile appModule.android.applicationVariants.toList().first().javaCompile.outputs.files
testCompile 'com.google.android:android:4.1.1.4'
/* FIXME : prevent Stub! error
testCompile files(appModule.plugins.findPlugin("com.android.application").getBootClasspath())
*/
compile project(':app')
}
添加自定义RobolectricTestRunner调整文件路径。 再看资产路径。
Add custom RobolectricTestRunner to adjust file paths. Look at the assets path.
public class MyRobolectricTestRunner extends RobolectricTestRunner {
private static final String APP_MODULE_NAME = "app";
/**
* Creates a runner to run {@code testClass}. Looks in your working directory for your AndroidManifest.xml file
* and res directory by default. Use the {@link org.robolectric.annotation.Config} annotation to configure.
*
* @param testClass the test class to be run
* @throws org.junit.runners.model.InitializationError if junit says so
*/
public MyRobolectricTestRunner(Class<?> testClass) throws InitializationError {
super(testClass);
System.out.println("testclass="+testClass);
}
@Override
protected AndroidManifest getAppManifest(Config config) {
String userDir = System.getProperty("user.dir", "./");
File current = new File(userDir);
String prefix;
if (new File(current, APP_MODULE_NAME).exists()) {
System.out.println("Probably running on AndroidStudio");
prefix = "./" + APP_MODULE_NAME;
}
else if (new File(current.getParentFile(), APP_MODULE_NAME).exists()) {
System.out.println("Probably running on Console");
prefix = "../" + APP_MODULE_NAME;
}
else {
throw new IllegalStateException("Could not find app module, app module should be \"app\" directory in the project.");
}
System.setProperty("android.manifest", prefix + "/src/main/AndroidManifest.xml");
System.setProperty("android.resources", prefix + "/src/main/res");
System.setProperty("android.assets", prefix + "/src/androidTest/assets");
return super.getAppManifest(config);
}
}
我跟着这个博客做到这一点。
I followed this blog to do it.
<一个href="http://blog.blundell-apps.com/android-gradle-app-with-robolectric-junit-tests/">http://blog.blundell-apps.com/android-gradle-app-with-robolectric-junit-tests/ <一href="http://blog.blundell-apps.com/how-to-run-robolectric-junit-tests-in-android-studio/">http://blog.blundell-apps.com/how-to-run-robolectric-junit-tests-in-android-studio/
完整的例子codeS是这里
full example codes are here
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