Question

对于我的Android应用程序，我使用Realm移动数据库。我想为此编写测试，我发现测试的最佳方法是使用仪器测试。

这是我的数据库类的构造函数：

public Database(Context context) {
    this.context = context.getApplicationContext();

    Realm.init(context);

    RealmConfiguration realmConfig = new RealmConfiguration.Builder()
            .name("com.arnowouter.badger.realmdatabase") // TODO: 4/10/2016 check if encryptable
            .build();

    realm = Realm.getInstance(realmConfig);
}

如您所见，调用了Realm.init（context）。但是当我运行这个测试时：

@RunWith(AndroidJUnit4.class)
@MediumTest
public class DatabaseTest {

    Database database;
    Context context;

    @Before
    public void setupDatabase() {
        context = InstrumentationRegistry.getContext();
        database = new Database(context);
    }
}

我收到此错误：

java.lang.IllegalStateException: Call `Realm.init(Context)` before creating a RealmConfiguration
        at io.realm.RealmConfiguration$Builder.<init>(RealmConfiguration.java:399)
        at io.realm.RealmConfiguration$Builder.<init>(RealmConfiguration.java:394)
        at com.arnowouter.badger.Database.Database.<init>(Database.java:38)
        at com.arnowouter.badger.DatabaseTest.setupDatabase(DatabaseTest.java:27)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.junit.runners.Suite.runChild(Suite.java:128)
        at org.junit.runners.Suite.runChild(Suite.java:27)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
        at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
        at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
        at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
        at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1970)

Answer 1

考虑到Realm中存储的Context是这样的应用程序配置

// Thread pool for all async operations (Query & transaction)
volatile static Context applicationContext;

这是如此初始化

public static synchronized void init(Context context) {
    if (BaseRealm.applicationContext == null) {
        if (context == null) {
            throw new IllegalArgumentException("Non-null context required.");
        }
        RealmCore.loadLibrary(context);
        //...
        BaseRealm.applicationContext = context.getApplicationContext();
    }
}

这意味着您提供的context会为null返回context.getApplicationContext()。

不幸的是，显然，检测的上下文会为null返回getFilesDir()，因此我们需要获取应用程序或活动上下文。

我可能只是在静态变量中设置应用程序，并使用它。

public class CustomApplication extends Application {
    private static CustomApplication INSTANCE;

    public static CustomApplication get() {
        return INSTANCE;
    }

    @Override
    public void onCreate() {
        if(INSTANCE == null) {
            INSTANCE = this;
        }
    }
}

在清单中：

<application name=".CustomApplication"

你可以这样做：

@RunWith(AndroidJUnit4.class)
@MediumTest
public class DatabaseTest {

    Database database;
    Context context;

    @Before
    public void setupDatabase() {
        Realm.init(CustomApplication.get());
        context = InstrumentationRegistry.getContext();
        database = new Database(context);
    }
}

Realm数据库的工具测试在创建Realmconfiguration之前给出了“Call'Franm.init（Context）'”即使我称它为

1 个答案: