public void DefaultNullOrEmpty_ExpectedValues(StringValues stringValues)
{
Assert.Empty(stringValues);
Assert.Null((string)stringValues);
Assert.Equal((string)null, stringValues);
Assert.Equal(string.Empty, stringValues.ToString());
Assert.Equal(new string[0], stringValues.ToArray());
Assert.True(StringValues.IsNullOrEmpty(stringValues));
Assert.Throws <IndexOutOfRangeException>(() => stringValues[0]);
Assert.Throws <IndexOutOfRangeException>(() => ((IList <string>)stringValues)[0]);
Assert.Equal(string.Empty, stringValues.ToString());
Assert.Equal(-1, ((IList <string>)stringValues).IndexOf(null));
Assert.Equal(-1, ((IList <string>)stringValues).IndexOf(string.Empty));
Assert.Equal(-1, ((IList <string>)stringValues).IndexOf("not there"));
Assert.False(((ICollection <string>)stringValues).Contains(null));
Assert.False(((ICollection <string>)stringValues).Contains(string.Empty));
Assert.False(((ICollection <string>)stringValues).Contains("not there"));
Assert.Empty(stringValues);
}
public void ToString_ExpectedValues(StringValues stringValues, string expected)
{
Assert.Equal(stringValues.ToString(), expected);
}
[Obsolete("Try remove this.")] public static string ToStringFirstOrDefault(this StringValues sv) => sv.Count == 1 ? sv.ToString() : null;