每当我尝试对应用程序模块中依赖于库模块中的类的类运行单元测试时,我都会得到以下信息:
java.lang.NoClassDefFoundError: de/ivu/junittest/DummyData
at de.ivu.junittest.app.DummyModel.<init>(DummyModel.java:16)
at DummyModelTest.testInstantiation(DummyModelTest.java:7)
...
在上面的示例中,DummyData
是的一部分lib
模块,同时DummyModel
是的一部分app
模块。DummyModel
有一个类型的成员DummyData
,但是在测试类中实例化它DummyModelTest
在测试时导致上述异常。
项目结构如下:
JUnitTestProject
app [module]
src
main
java
de.ivu.junittest.app
DummyModel.java
...
...
test
java
de.ivu.junittest.app
DummyModelTest.java
...
lib [module]
src
main
java
de.ivu.junittest
DummyData.java
...
...
The build.gradle
为了app
模块包含以下内容:
apply plugin: 'android'
android {
compileSdkVersion 19
buildToolsVersion "19.0.1"
defaultConfig {
minSdkVersion 7
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
sourceSets {
unitTest {
java.srcDir file('src/test/java')
resources.srcDir file('src/test/res')
}
}
configurations {
unitTestCompile.extendsFrom runtime
unitTestRuntime.extendsFrom unitTestCompile
}
dependencies {
compile 'com.android.support:appcompat-v7:+'
compile project (':lib')
compile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
unitTestCompile files("$project.buildDir/classes/release")
unitTestCompile 'junit:junit:4.+'
unitTestCompile 'org.robolectric:robolectric:2.+'
unitTestCompile 'com.google.android:android:4.+'
unitTestCompile project (':lib')
unitTestCompile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
instrumentTestCompile 'junit:junit:4.+'
instrumentTestCompile 'org.robolectric:robolectric:2.+'
}
task unitTest(type:Test, dependsOn: assemble) {
testClassesDir = project.sourceSets.unitTest.output.classesDir
classpath = project.sourceSets.unitTest.runtimeClasspath
}
check.dependsOn unitTest
最后是三个 java 类的来源,从DummyData
:
package de.ivu.junittest;
import android.util.Log;
public class DummyData {
private int data;
public int getData() {
return data;
}
public void setData(int data) {
this.data = data;
}
}
The DummyModel
class:
package de.ivu.junittest.app;
import android.util.Log;
import de.ivu.junittest.DummyData;
public class DummyModel {
private DummyData data = new DummyData();
public void setData(int data) {
this.data.setData(data);
}
public int getData() {
return this.data.getData();
}
}
最后,DummyModelTest
:
import static org.junit.Assert.assertEquals;
import org.junit.runner.RunWith;
import org.junit.Test;
import org.robolectric.RobolectricTestRunner;
import de.ivu.junittest.app.DummyModel;
@RunWith(RobolectricTestRunner.class)
public class DummyModelTest {
@Test
public void testInstantiation() {
DummyModel model = new DummyModel();
model.setData(42);
assertEquals(model.getData(), 42);
}
}
在尝试了十多种不同的方法之后,我们非常感谢任何帮助。