TestCleanUpBatchClass

@isTest
private class TestCleanUpBatchClass {
	static testmethod void test() {
		// The query used by the batch job.
		String query = 'SELECT Id,CreatedDate FROM Merchandise__c ' +
			'WHERE Id NOT IN (SELECT Merchandise__c FROM Line_Item__c)';
        
		// Create some test merchandise items to be deleted by the batch job.
		Warehouse__c w = new Warehouse__c(
		Name='Warehouse 1',
		City__c='San Francisco',
		Location__Latitude__s=37.7833,
		Location__Longitude__s=122.4167);
		insert w;
        
		Merchandise__c[] ml = new List<Merchandise__c>();
		
        for (Integer i=0;i<10;i++) {
			Merchandise__c m = new Merchandise__c(
				Name='Merchandise ' + i,
				Price__c=2,
				Quantity__c=100,
				Warehouse__c = w.Id);
			ml.add(m);
		}
		insert ml;
		
        Test.startTest();
		
        CleanUpRecords c = new CleanUpRecords(query);
		Database.executeBatch(c);
		
        Test.stopTest();
		
        // Verify merchandise items got deleted
		Integer i = [SELECT COUNT() FROM Merchandise__c];
		System.assertEquals(i, 0);
	}
}