public void ParseAll_GivenMultiplePartNumbers_ReturnsAll()
{
var text = " this part: 1234567, this duplicate part: 1234567, that part: 1A2345, and the other part: 20R3456 are all part numbers";
var partNumbers = PartNumber.ParseAll(text);
Assert.Equal(3, partNumbers.Count());
Assert.Contains(new PartNumber("1234567"), partNumbers);
Assert.Contains(new PartNumber("1A2345"), partNumbers);
Assert.Contains(new PartNumber("20R3456"), partNumbers);
}