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

        public static void IndexOf_Invalid()
        {
            // Value is null
            Assert.Throws<ArgumentNullException>("value", () => "foo".IndexOf(null));
            Assert.Throws<ArgumentNullException>("value", () => "foo".IndexOf(null, 0));
            Assert.Throws<ArgumentNullException>("value", () => "foo".IndexOf(null, 0, 0));
            Assert.Throws<ArgumentNullException>("value", () => "foo".IndexOf(null, 0, StringComparison.CurrentCulture));
            Assert.Throws<ArgumentNullException>("value", () => "foo".IndexOf(null, 0, 0, StringComparison.CurrentCulture));

            // Start index < 0
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", -1));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf('o', -1));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", -1, 0));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf('o', -1, 0));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", -1, StringComparison.CurrentCulture));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", -1, 0, StringComparison.CurrentCulture));

            // Start index > string.Length
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", 4));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf('o', 4));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", 4, 0));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf('o', 4, 0));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", 4, 0, StringComparison.CurrentCulture));
            Assert.Throws<ArgumentOutOfRangeException>("startIndex", () => "foo".IndexOf("o", 4, 0, StringComparison.CurrentCulture));

            // Count < 0
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf("o", 0, -1));
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf('o', 0, -1));
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf("o", 0, -1, StringComparison.CurrentCulture));

            // Count > string.Length
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf("o", 0, 4));
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf('o', 0, 4));
            Assert.Throws<ArgumentOutOfRangeException>("count", () => "foo".IndexOf("o", 0, 4, StringComparison.CurrentCulture));

            // Invalid comparison type
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", StringComparison.CurrentCulture - 1));
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", StringComparison.OrdinalIgnoreCase + 1));
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", 0, StringComparison.CurrentCulture - 1));
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", 0, StringComparison.OrdinalIgnoreCase + 1));
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", 0, 0, StringComparison.CurrentCulture - 1));
            Assert.Throws<ArgumentException>("comparisonType", () => "foo".IndexOf("o", 0, 0, StringComparison.OrdinalIgnoreCase + 1));
        }