System.Tests.StringTests.Equals C# (CSharp) Method

        public static void Equals(string s1, object obj, StringComparison comparisonType, bool expected)
        {
            string s2 = obj as string;
            if (s1 != null)
            {
                if (comparisonType == StringComparison.Ordinal)
                {
                    // Use Equals(object)
                    Assert.Equal(expected, s1.Equals(obj));
                    Assert.Equal(expected, s1.Equals(s2));
                }
                // Use Equals(string, comparisonType)
                Assert.Equal(expected, s1.Equals(s2, comparisonType));
            }
            if (comparisonType == StringComparison.Ordinal)
            {
                // Use Equals(string, string)
                Assert.Equal(expected, string.Equals(s1, s2));
            }
            // Use Equals(string, string, StringComparison)
            Assert.Equal(expected, string.Equals(s1, s2, comparisonType));

            // If two strings are equal ordinally, then they must have the same hash code.
            if (s1 != null && s2 != null && comparisonType == StringComparison.Ordinal)
            {
                Assert.Equal(expected, s1.GetHashCode().Equals(s2.GetHashCode()));
            }
            if (s1 != null)
            {
                Assert.Equal(s1.GetHashCode(), s1.GetHashCode());
            }
        }