diff --git a/X10D.Tests/src/Linq/ReadOnlySpanTests.cs b/X10D.Tests/src/Linq/ReadOnlySpanTests.cs
new file mode 100644
index 0000000..e33f5cd
--- /dev/null
+++ b/X10D.Tests/src/Linq/ReadOnlySpanTests.cs
@@ -0,0 +1,58 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Linq;
+
+namespace X10D.Tests.Linq;
+
+[TestClass]
+public class ReadOnlySpanTests
+{
+    [TestMethod]
+    public void AllShouldReturnTrueForEmptySpan()
+    {
+        var span = new ReadOnlySpan<int>();
+        Assert.IsTrue(span.All(x => x > 0));
+    }
+
+    [TestMethod]
+    public void AllShouldBeCorrect()
+    {
+        var span = new ReadOnlySpan<int>(new[] {2, 4, 6, 8, 10});
+        Assert.IsTrue(span.All(x => x % 2 == 0));
+        Assert.IsFalse(span.All(x => x % 2 == 1));
+    }
+
+    [TestMethod]
+    public void AnyShouldReturnFalseForEmptySpan()
+    {
+        var span = new ReadOnlySpan<int>();
+        Assert.IsFalse(span.Any(x => x > 0));
+    }
+
+    [TestMethod]
+    public void AnyShouldBeCorrect()
+    {
+        var span = new ReadOnlySpan<int>(new[] {2, 4, 6, 8, 10});
+        Assert.IsTrue(span.Any(x => x % 2 == 0));
+        Assert.IsFalse(span.Any(x => x % 2 == 1));
+    }
+
+    [TestMethod]
+    public void AllNullPredicateShouldThrow()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new ReadOnlySpan<int>();
+            return span.All(null!);
+        });
+    }
+
+    [TestMethod]
+    public void AnyNullPredicateShouldThrow()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new ReadOnlySpan<int>();
+            return span.Any(null!);
+        });
+    }
+}
diff --git a/X10D.Tests/src/Linq/SpanTests.cs b/X10D.Tests/src/Linq/SpanTests.cs
new file mode 100644
index 0000000..98c5fe3
--- /dev/null
+++ b/X10D.Tests/src/Linq/SpanTests.cs
@@ -0,0 +1,58 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Linq;
+
+namespace X10D.Tests.Linq;
+
+[TestClass]
+public class SpanTests
+{
+    [TestMethod]
+    public void AllShouldReturnTrueForEmptySpan()
+    {
+        var span = new Span<int>();
+        Assert.IsTrue(span.All(x => x > 0));
+    }
+
+    [TestMethod]
+    public void AllShouldBeCorrect()
+    {
+        var span = new Span<int>(new[] {2, 4, 6, 8, 10});
+        Assert.IsTrue(span.All(x => x % 2 == 0));
+        Assert.IsFalse(span.All(x => x % 2 == 1));
+    }
+
+    [TestMethod]
+    public void AnyShouldReturnFalseForEmptySpan()
+    {
+        var span = new Span<int>();
+        Assert.IsFalse(span.Any(x => x > 0));
+    }
+
+    [TestMethod]
+    public void AnyShouldBeCorrect()
+    {
+        var span = new Span<int>(new[] {2, 4, 6, 8, 10});
+        Assert.IsTrue(span.Any(x => x % 2 == 0));
+        Assert.IsFalse(span.Any(x => x % 2 == 1));
+    }
+
+    [TestMethod]
+    public void AllNullPredicateShouldThrow()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new Span<int>();
+            return span.All(null!);
+        });
+    }
+
+    [TestMethod]
+    public void AnyNullPredicateShouldThrow()
+    {
+        Assert.ThrowsException<ArgumentNullException>(() =>
+        {
+            var span = new Span<int>();
+            return span.Any(null!);
+        });
+    }
+}
diff --git a/X10D/src/SpanExtensions/ReadOnlySpanExtensions.cs b/X10D/src/Linq/ReadOnlySpanExtensions.cs
similarity index 99%
rename from X10D/src/SpanExtensions/ReadOnlySpanExtensions.cs
rename to X10D/src/Linq/ReadOnlySpanExtensions.cs
index 66dc7e9..3d1981c 100644
--- a/X10D/src/SpanExtensions/ReadOnlySpanExtensions.cs
+++ b/X10D/src/Linq/ReadOnlySpanExtensions.cs
@@ -1,4 +1,4 @@
-namespace X10D;
+namespace X10D.Linq;
 
 /// <summary>
 ///     Extension methods for <see cref="ReadOnlySpan{T}" />.
diff --git a/X10D/src/SpanExtensions/SpanExtensions.cs b/X10D/src/Linq/SpanExtensions.cs
similarity index 99%
rename from X10D/src/SpanExtensions/SpanExtensions.cs
rename to X10D/src/Linq/SpanExtensions.cs
index f1e9a9d..641c54b 100644
--- a/X10D/src/SpanExtensions/SpanExtensions.cs
+++ b/X10D/src/Linq/SpanExtensions.cs
@@ -1,4 +1,4 @@
-namespace X10D;
+namespace X10D.Linq;
 
 /// <summary>
 ///     Extension methods for <see cref="Span{T}" />.