public void BusinessRepository_MultipleNullStrings_FormatMakesAllEmpty()
{
//Arrange: a presentation repository with multiple units of unformatted strings
BusinessRepository<MockBusinessUnit> collection =
new MockBusinessRepository();
collection.Create(new MockBusinessUnit { attrTwo = null });
collection.Create(new MockBusinessUnit { attrTwo = null});
//Act: The presentation repositorie's format function is called
collection.Format();
collection.ForEach(x => Assert.AreEqual(x.attrTwo, string.Empty));
}