public void GetFirstTest_Exists_Pass()
{
var dict = new BiDictionaryOneToOne <int, int> {
{ 0, 815 },
};
Assert.Equal(0, dict.GetFirst(815));
}
public void GetFirstTest_Missing_Fail()
{
var dict = new BiDictionaryOneToOne <int, int> {
{ 0, 815 },
};
object Check() => dict.GetFirst(888);
Assert.Throws <ArgumentException>(Check);
}