diff --git a/src/Tests/AntiAliasingTests.cs b/src/Tests/AntiAliasingTests.cs
index 67512c3..764947b 100644
--- a/src/Tests/AntiAliasingTests.cs
+++ b/src/Tests/AntiAliasingTests.cs
@@ -1,5 +1,4 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using System;
 using System.IO;
 using System.Text;
 using static PDFtoImage.Conversion;
@@ -10,15 +9,6 @@ namespace PDFtoImage.Tests
     [TestClass]
     public class AntiAliasingTests : TestBase
     {
-        [TestInitialize]
-        public void Initialize()
-        {
-#if NET6_0_OR_GREATER
-            if (!OperatingSystem.IsWindows() && !OperatingSystem.IsLinux() && !OperatingSystem.IsMacOS())
-                Assert.Inconclusive("This test must run on Windows, Linux or macOS.");
-#endif
-        }
-
         [TestMethod]
         [DataRow(null, DisplayName = "Default (None)")]
         [DataRow(PdfAntiAliasing.None, DisplayName = "None")]
diff --git a/src/Tests/BackgroundColorTests.cs b/src/Tests/BackgroundColorTests.cs
index 2171350..ab4d29e 100644
--- a/src/Tests/BackgroundColorTests.cs
+++ b/src/Tests/BackgroundColorTests.cs
@@ -1,6 +1,5 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using SkiaSharp;
-using System;
 using System.IO;
 using static PDFtoImage.Conversion;
 using static PDFtoImage.Tests.TestUtils;
@@ -10,15 +9,6 @@ namespace PDFtoImage.Tests
     [TestClass]
     public class BackgroundColorTests : TestBase
     {
-        [TestInitialize]
-        public void Initialize()
-        {
-#if NET6_0_OR_GREATER
-            if (!OperatingSystem.IsWindows() && !OperatingSystem.IsLinux() && !OperatingSystem.IsMacOS())
-                Assert.Inconclusive("This test must run on Windows, Linux or macOS.");
-#endif
-        }
-
         [TestMethod]
         [DataRow(null, DisplayName = "Default (White)")]
         [DataRow(0xFFFFFFFF, DisplayName = "White")]
diff --git a/src/Tests/FormFillTests.cs b/src/Tests/FormFillTests.cs
index 01b926a..952da8c 100644
--- a/src/Tests/FormFillTests.cs
+++ b/src/Tests/FormFillTests.cs
@@ -1,5 +1,4 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using System;
 using System.IO;
 using static PDFtoImage.Conversion;
 using static PDFtoImage.Tests.TestUtils;
@@ -9,15 +8,6 @@ namespace PDFtoImage.Tests
     [TestClass]
     public class FormFillTests : TestBase
     {
-        [TestInitialize]
-        public void Initialize()
-        {
-#if NET6_0_OR_GREATER
-            if (!OperatingSystem.IsWindows() && !OperatingSystem.IsLinux() && !OperatingSystem.IsMacOS())
-                Assert.Inconclusive("This test must run on Windows, Linux or macOS.");
-#endif
-        }
-
         [TestMethod]
         [DataRow(null, DisplayName = "Default (no form fill)")]
         [DataRow(true, DisplayName = "Form fill")]