Updates to IsEmailAddress and MustBeEmailAddress

Code/Light.GuardClauses.Tests/ExecuteReadOnlySpanAssertion.cs

@@ -0,0 +1,26 @@
+#nullable enable
+using System;
+
+namespace Light.GuardClauses.Tests;
+
+public delegate void ExecuteReadOnlySpanAssertion<T>(
+    ReadOnlySpan<T> span,
+    ReadOnlySpanExceptionFactory<T> exceptionFactory
+);
+
+public delegate void ExecuteSpanAssertion<T>(
+    Span<T> span,
+    ReadOnlySpanExceptionFactory<T> exceptionFactory
+);
+
+public delegate void ExecuteReadOnlySpanAssertion<TItem, TValue>(
+    ReadOnlySpan<TItem> span,
+    TValue additionalValue,
+    ReadOnlySpanExceptionFactory<TItem, TValue> exceptionFactory
+);
+
+public delegate void ExecuteSpanAssertion<TItem, TValue>(
+    Span<TItem> span,
+    TValue additionalValue,
+    ReadOnlySpanExceptionFactory<TItem, TValue> exceptionFactory
+);

Code/Light.GuardClauses.Tests/StringAssertions/InvalidEmailAddresses.cs

@@ -0,0 +1,33 @@
+using Xunit;
+
+namespace Light.GuardClauses.Tests.StringAssertions;
+
+public class InvalidEmailAddresses : TheoryData<string>
+{
+    public InvalidEmailAddresses()
+    {
+        Add("plainaddress");
+        Add("#@%^%#$@#$@#.com");
+        Add("@domain.com");
+        Add("Joe Smith <email@domain.com>");
+        Add("email.domain.com");
+        Add("email@domain@domain.com");
+        Add(".email@domain.com");
+        Add("email.@domain.com");
+        Add("email..email@domain.com");
+        Add("email@domain.com (Joe Smith)");
+        Add("email@domain");
+        Add("email@-domain.com");
+        Add("email@111.222.333.44444");
+        Add("email@domain..com");
+        Add("email@256.256.256.256");
+    }
+}
+
+public sealed class InvalidEmailAddressesWithNull : InvalidEmailAddresses
+{
+    public InvalidEmailAddressesWithNull()
+    {
+        Add(null);
+    }
+}

Code/Light.GuardClauses.Tests/StringAssertions/IsEmailAddressTests.cs

@@ -0,0 +1,108 @@
+using System;
+using FluentAssertions;
+using Xunit;
+
+namespace Light.GuardClauses.Tests.StringAssertions;
+
+public sealed class IsEmailAddressTests
+{
+    [Theory]
+    [ClassData(typeof(InvalidEmailAddressesWithNull))]
+    public void IsNotValidEmailAddress(string email)
+    {
+        var isValid = email.IsEmailAddress();
+
+        isValid.Should().BeFalse();
+    }
+
+    [Theory]
+    [ClassData(typeof(ValidEmailAddresses))]
+    public void IsValidEmailAddress(string email)
+    {
+        var isValid = email.IsEmailAddress();
+
+        isValid.Should().BeTrue();
+    }
+
+#if NET8_0
+    [Theory]
+    [ClassData(typeof(InvalidEmailAddressesWithNull))]
+    public void IsNotValidEmailAddress_ReadOnlySpan(string email)
+    {
+        var span = new ReadOnlySpan<char>(email?.ToCharArray() ?? []);
+        var isValid = span.IsEmailAddress();
+
+        isValid.Should().BeFalse();
+    }
+
+    [Theory]
+    [ClassData(typeof(ValidEmailAddresses))]
+    public void IsValidEmailAddress_ReadOnlySpan(string email)
+    {
+        var span = email.AsSpan();
+        var isValid = span.IsEmailAddress();
+
+        isValid.Should().BeTrue();
+    }
+
+    [Theory]
+    [ClassData(typeof(InvalidEmailAddressesWithNull))]
+    public void IsNotValidEmailAddress_Span(string email)
+    {
+        var span = new Span<char>(email?.ToCharArray() ?? []);
+        var isValid = span.IsEmailAddress();
+
+        isValid.Should().BeFalse();
+    }
+
+    [Theory]
+    [ClassData(typeof(ValidEmailAddresses))]
+    public void IsValidEmailAddress_Span(string email)
+    {
+        var span = new Span<char>(email.ToCharArray());
+        var isValid = span.IsEmailAddress();
+
+        isValid.Should().BeTrue();
+    }
+
+    [Theory]
+    [ClassData(typeof(InvalidEmailAddressesWithNull))]
+    public void IsNotValidEmailAddress_Memory(string email)
+    {
+        var memory = email?.ToCharArray().AsMemory() ?? Memory<char>.Empty;
+        var isValid = memory.IsEmailAddress();
+
+        isValid.Should().BeFalse();
+    }
+
+    [Theory]
+    [ClassData(typeof(ValidEmailAddresses))]
+    public void IsValidEmailAddress_Memory(string email)
+    {
+        var memory = email.ToCharArray().AsMemory();
+        var isValid = memory.IsEmailAddress();
+
+        isValid.Should().BeTrue();
+    }
+
+    [Theory]
+    [ClassData(typeof(InvalidEmailAddressesWithNull))]
+    public void IsNotValidEmailAddress_ReadOnlyMemory(string email)
+    {
+        var memory = new ReadOnlyMemory<char>(email?.ToCharArray() ?? []);
+        var isValid = memory.IsEmailAddress();
+
+        isValid.Should().BeFalse();
+    }
+
+    [Theory]
+    [ClassData(typeof(ValidEmailAddresses))]
+    public void IsValidEmailAddress_ReadOnlyMemory(string email)
+    {
+        var memory = new ReadOnlyMemory<char>(email.ToCharArray());
+        var isValid = memory.IsEmailAddress();
+
+        isValid.Should().BeTrue();
+    }
+#endif
+}