public void FormatFieldTest()
{
string tag = "600";
List <Subfield> subfields = new List <Subfield>();
Subfield subfield = new Subfield('a', "It's a book!");
subfields.Add(subfield);
subfield = new Subfield('b', "Anne Author");
subfields.Add(subfield);
subfield = new Subfield('c', "Some text");
subfields.Add(subfield);
subfield = new Subfield('d', "Some more text");
subfields.Add(subfield);
subfield = new Subfield('v', "Some fancy text");
subfields.Add(subfield);
subfield = new Subfield('z', "Some more fancy text");
subfields.Add(subfield);
DataField target = new DataField(tag, subfields);
char[] excludeCodes = { 'a', 'b' };
string expected = "Some text Some more text -- Some fancy text -- Some more fancy text";
string actual = target.FormatField(excludeCodes);
Assert.AreEqual(expected, actual);
}