diff --git a/Funcky.Test/Extensions/ParseExtensions/ParseExtensionsTest.Generic.cs b/Funcky.Test/Extensions/ParseExtensions/ParseExtensionsTest.Generic.cs
new file mode 100644
index 00000000..d6277843
--- /dev/null
+++ b/Funcky.Test/Extensions/ParseExtensions/ParseExtensionsTest.Generic.cs
@@ -0,0 +1,36 @@
+#if GENERIC_PARSEABLE
+using System.Globalization;
+
+namespace Funcky.Test.Extensions.ParseExtensions;
+
+public sealed partial class ParseExtensionsTest
+{
+    [Theory]
+    [MemberData(nameof(ParseableDoubleNumbers))]
+    public void ParseGenericStringReturnsTheExpectedDouble(Option<double> expected, string input)
+    {
+        Assert.Equal(expected, input.ParseNumberOrNone<double>(NumberStyles.Number, null));
+        Assert.Equal(expected, input.ParseOrNone<double>(null));
+    }
+
+    [Theory]
+    [MemberData(nameof(ParseableDoubleNumbers))]
+    public void ParseGenericSpanReturnsTheExpectedDouble(Option<double> expected, string input)
+    {
+        Assert.Equal(expected, input.AsSpan().ParseNumberOrNone<double>(NumberStyles.Number, null));
+        Assert.Equal(expected, input.AsSpan().ParseOrNone<double>(null));
+    }
+
+    public static TheoryData<Option<double>, string> ParseableDoubleNumbers()
+        => new()
+        {
+            { Option.Some(1.0), "1.0" },
+            { Option.Some(3.145), "3.145" },
+            { Option.Some(0.5), ".5" },
+            { Option.Some(1.0), "1.0" },
+            { Option.Some(42.0), "42" },
+            { Option<double>.None, string.Empty },
+            { Option<double>.None, "no-number" },
+        };
+}
+#endif