在单元测试执行期间如何从资产文件夹访问文件？我的项目是使用Gradle构建的,我使用Robolectric运行测试.毕业生似乎正在认识资产：
这是我如何努力阅读文件：
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);
}
但是流始终为空.我尝试了许多不同的方法,即使用不同方法定义到文件的路径.
提前非常感谢你.
解决方法
基本上你必须使用上下文来读取资产.您不能使用ClassLoader加载资源,因为它不在类路径中.我不知道你如何运行Robolectric测试用例.这是我在Android studio和gralde命令中如何实现的.
我在应用程序项目中添加了单独的应用程序单元测试模块来运行Robolectric测试用例.
通过正确的构建配置和定制的RobolectricTestRunner,以下测试用例将通过.
@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);
}
}
APP-单元测试/的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来调整文件路径.
看资产的路径.
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);
}
}
我跟着这个博客来做.
http://blog.blundell-apps.com/android-gradle-app-with-robolectric-junit-tests/
http://blog.blundell-apps.com/how-to-run-robolectric-junit-tests-in-android-studio/
