Fix bug, where a string stated as content is handled like a path

src/Fallout.Common/IO/XmlTasks.cs

@@ -28,7 +28,7 @@ public static IEnumerable<XElement> XmlPeekElements(string path, string xpath, p
 
     public static IEnumerable<XElement> XmlPeekElementsFromString(string content, string xpath, params (string prefix, string uri)[] namespaces)
     {
-        return XmlPeekElements(XDocument.Load(content), xpath, namespaces);
+        return XmlPeekElements(XDocument.Parse(content), xpath, namespaces);
     }
 
     public static string XmlPeekSingle(string path, string xpath, params (string prefix, string uri)[] namespaces)

tests/Fallout.Common.Specs/XmlTasksSpecs.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Linq;
+using System.Xml;
+using Fallout.Common.IO;
+using FluentAssertions;
+using Xunit;
+
+namespace Fallout.Common.Specs;
+
+public class XmlTasksSpecs
+{
+    [Fact]
+    public void Loading_from_xml_string_works()
+    {
+        var content = @"<root><element>value</element></root>";
+        var elements = XmlTasks.XmlPeekElementsFromString(content, "/root/element").ToList();
+
+        elements.Should().HaveCount(1);
+        elements.Single().Value.Should().Be("value");
+    }
+
+    [Fact]
+    public void Loading_from_file_path_throws()
+    {
+        var content = "C:\\temp\\test.xml";
+
+        Action action = () => XmlTasks.XmlPeekElementsFromString(content, "/root/element");
+
+        action.Should().Throw<XmlException>();
+    }
+
+    [Fact]
+    public void Loading_from_url_throws()
+    {
+        var content = "https://example.com/test.xml";
+
+        Action action = () => XmlTasks.XmlPeekElementsFromString(content, "/root/element");
+
+        action.Should().Throw<XmlException>();
+    }
+}