android - Robolectric ContentProvider 测试

Question

我注意到时不时会有关于使用 Robolectric 测试自定义 ContentProvider 的问题。然而，对于如何正确地做到这一点，从来没有一个具体而明确的答案。我偶然发现了两种不同的方法:

• 有人说您可以简单地实例化内存中的 ContentProvider，您可以使用它来插入和查询数据 (https://gist.github.com/anonymous/6139359)

• 另一种说法是使用 ShadowContentResolver 设置模拟光标数据 (https://groups.google.com/d/msg/robolectric/r35mMirIkTs/xJJBNXl_RgwJ)

但是，我在这两种方法中都得到了 java.lang.InstantiationException。有一些 SO 帖子说这是由于 SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java) 在 Robolectric (Android + Robolectric - RuntimeException / InstantiationException in queryBuilder.query() in ContentProvider) 中没有被覆盖。

我想我的问题是 - 是否有任何首选的解决方法可以使测试 ContentProvider 成为可能。或者是否有比上述两种方法更好的其他方法。

Answer 1

这是对我来说效果很好的 Robolectric (v2.4) 测试:

import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;

import org.joda.time.LocalDate;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;
import org.robolectric.shadows.ShadowContentResolver;

import co.tomup.app.db.DbSchema;
import co.tomup.app.db.TomupContentProvider;
import co.tomup.app.db.model.CalendarDay;
import co.tomup.app.db.tables.CalendarDayTable;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

@Config(emulateSdk = 18)
@RunWith(RobolectricTestRunner.class)
public class CalendarDayProviderTest {

    private ContentResolver mContentResolver;
    private ShadowContentResolver mShadowContentResolver;
    private TomupContentProvider mProvider;

    @Before
    public void setup() {
        mProvider = new TomupContentProvider();
        mContentResolver = Robolectric.application.getContentResolver();
        mShadowContentResolver = Robolectric.shadowOf(mContentResolver);
        mProvider.onCreate();
        ShadowContentResolver.registerProvider(DbSchema.AUTHORITY, mProvider);
    }

    @Test
    public void testInsertAndDelete() {
        // insert
        CalendarDay calendarDay = new CalendarDay();
        calendarDay.setId(1L);
        calendarDay.setDay(new LocalDate());
        calendarDay.setMoonPhase("new");
        calendarDay.setSunrise(1);
        calendarDay.setSunset(100);
        Uri insertionId = mContentResolver.insert(CalendarDayTable.CONTENT_URI,
                calendarDay.toSQLiteContentValues());
        Cursor cursorCheck = mShadowContentResolver.query(CalendarDayTable.CONTENT_URI,
                null, null, null, null);
        while (cursorCheck.moveToNext()) {
            CalendarDay calendarDayCheck = CalendarDay.fromSQLiteCursor(cursorCheck);
            assertEquals(calendarDay, calendarDayCheck);
        }
        assertTrue(cursorCheck.getCount() > 0);
        // delete
        mShadowContentResolver.delete(insertionId,
                null, null);
        cursorCheck = mShadowContentResolver.query(CalendarDayTable.CONTENT_URI,
                null, null, null, null);
        assertTrue(cursorCheck.getCount() == 0);
    }
}