System.Net.Http.Headers.StringWithQualityHeaderValue.Equals C# (CSharp) Method

        public override bool Equals(object obj)
        {
            StringWithQualityHeaderValue other = obj as StringWithQualityHeaderValue;

            if (other == null)
            {
                return false;
            }

            if (!string.Equals(_value, other._value, StringComparison.OrdinalIgnoreCase))
            {
                return false;
            }

            if (_quality.HasValue)
            {
                // Note that we don't consider double.Epsilon here. We really consider two values equal if they're
                // actually equal. This makes sure that we also get the same hashcode for two values considered equal
                // by Equals(). 
                return other._quality.HasValue && (_quality.Value == other._quality.Value);
            }

            // If we don't have a quality value, then 'other' must also have no quality assigned in order to be 
            // considered equal.
            return !other._quality.HasValue;
        }

        public void Equals_UseSameAndDifferentRanges_EqualOrNotEqualNoExceptions()
        {
            StringWithQualityHeaderValue value1 = new StringWithQualityHeaderValue("t", 0.123);
            StringWithQualityHeaderValue value2 = new StringWithQualityHeaderValue("t", 0.123);
            StringWithQualityHeaderValue value3 = new StringWithQualityHeaderValue("T", 0.123);
            StringWithQualityHeaderValue value4 = new StringWithQualityHeaderValue("t");
            StringWithQualityHeaderValue value5 = new StringWithQualityHeaderValue("x", 0.123);
            StringWithQualityHeaderValue value6 = new StringWithQualityHeaderValue("t", 0.5);
            StringWithQualityHeaderValue value7 = new StringWithQualityHeaderValue("t", 0.1234);
            StringWithQualityHeaderValue value8 = new StringWithQualityHeaderValue("T");
            StringWithQualityHeaderValue value9 = new StringWithQualityHeaderValue("x");

            Assert.False(value1.Equals(null), "t; q=0.123 vs. <null>");
            Assert.True(value1.Equals(value2), "t; q=0.123 vs. t; q=0.123");
            Assert.True(value1.Equals(value3), "t; q=0.123 vs. T; q=0.123");
            Assert.False(value1.Equals(value4), "t; q=0.123 vs. t");
            Assert.False(value4.Equals(value1), "t vs. t; q=0.123");
            Assert.False(value1.Equals(value5), "t; q=0.123 vs. x; q=0.123");
            Assert.False(value1.Equals(value6), "t; q=0.123 vs. t; q=0.5");
            Assert.False(value1.Equals(value7), "t; q=0.123 vs. t; q=0.1234");
            Assert.True(value4.Equals(value8), "t vs. T");
            Assert.False(value4.Equals(value9), "t vs. T");
        }