internal void FromString(StringConverters sut, string expected)
        {
            // arrange
            // act
            var actual = sut.Convert(expected, CultureInfo.InvariantCulture);

            // assert
            Assert.Equal(expected, actual);
        }
        internal void FromStringArray(StringConverters sut, ImmutableArray <string> values)
        {
            // act
            var actual = sut.Convert(values, CultureInfo.InvariantCulture);
            // assert
            var expected = string.Join(", ", values);

            Assert.Equal(expected, actual);
        }
        internal void FromBool(StringConverters sut)
        {
            // arrange
            // act
            var actual = sut.Convert(true, CultureInfo.InvariantCulture);

            // assert
            Assert.Equal("True", actual);
        }