Code example for MockContentResolver

        PeriodicSync sync1 = new PeriodicSync(account1, authority, extras1, period1);
        PeriodicSync sync2 = new PeriodicSync(account1, authority, extras2, period1);
        PeriodicSync sync3 = new PeriodicSync(account1, authority, extras2, period2);
        PeriodicSync sync4 = new PeriodicSync(account2, authority, extras2, period2);
        MockContentResolver mockResolver = new MockContentResolver();
        SyncStorageEngine engine = SyncStorageEngine.newTestInstance(
                new TestContext(mockResolver, getContext()));
        removePeriodicSyncs(engine, account1, 0, authority);
        removePeriodicSyncs(engine, account2, 0, authority);
        removePeriodicSyncs(engine, account1, 1, authority);
        // this should add two distinct periodic syncs for account1 and one for account2 
        engine.addPeriodicSync(sync1.account, 0, sync1.authority, sync1.extras, sync1.period);
        engine.addPeriodicSync(sync2.account, 0, sync2.authority, sync2.extras, sync2.period);
        engine.addPeriodicSync(sync3.account, 0, sync3.authority, sync3.extras, sync3.period);
        engine.addPeriodicSync(sync4.account, 0, sync4.authority, sync4.extras, sync4.period);
        // add a second user 
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