diff --git a/ICSharpCode.Decompiler.Tests/Helpers/Tester.cs b/ICSharpCode.Decompiler.Tests/Helpers/Tester.cs
index 3c88f4a22..ffa2b9a40 100644
--- a/ICSharpCode.Decompiler.Tests/Helpers/Tester.cs
+++ b/ICSharpCode.Decompiler.Tests/Helpers/Tester.cs
@@ -73,6 +73,7 @@ namespace ICSharpCode.Decompiler.Tests.Helpers
 		CheckForOverflowUnderflow = 0x20000,
 		ProcessXmlDoc = 0x40000,
 		UseRoslyn4_14_0 = 0x80000,
+		EnableRuntimeAsync = 0x100000,
 		UseMcsMask = UseMcs2_6_4 | UseMcs5_23,
 		UseRoslynMask = UseRoslyn1_3_2 | UseRoslyn2_10_0 | UseRoslyn3_11_0 | UseRoslyn4_14_0 | UseRoslynLatest
 	}
@@ -605,13 +606,18 @@ namespace System.Runtime.CompilerServices
 				if (roslynVersion != "legacy")
 				{
 					otherOptions += "/shared ";
-					if (!targetNet40 && Version.Parse(RoslynToolset.SanitizeVersion(roslynVersion)).Major > 2)
+					var version = Version.Parse(RoslynToolset.SanitizeVersion(roslynVersion));
+					if (!targetNet40 && version.Major > 2)
 					{
 						if (flags.HasFlag(CompilerOptions.NullableEnable))
 							otherOptions += "/nullable+ ";
 						else
 							otherOptions += "/nullable- ";
 					}
+					if (!targetNet40 && roslynVersion == roslynLatestVersion && flags.HasFlag(CompilerOptions.EnableRuntimeAsync))
+					{
+						otherOptions += "/features:runtime-async=on ";
+					}
 				}
 
 				if (flags.HasFlag(CompilerOptions.Library))
diff --git a/ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs b/ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs
index 8810773c6..36b7ffa38 100644
--- a/ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs
+++ b/ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs
@@ -537,6 +537,46 @@ namespace ICSharpCode.Decompiler.Tests
 			await RunForLibrary(cscOptions: cscOptions);
 		}
 
+		[Test]
+		public async Task RuntimeAsync([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary("Async", cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview);
+		}
+
+		[Test]
+		public async Task RuntimeAsyncForeach([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary("AsyncForeach", cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview | CompilerOptions.GeneratePdb);
+		}
+
+		[Test]
+		public async Task RuntimeAsyncMain([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await Run("AsyncMain", cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview);
+		}
+
+		[Test]
+		public async Task RuntimeAsyncStreams([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary("AsyncStreams", cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview);
+		}
+
+		[Test]
+		public async Task RuntimeAsyncUsing([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary(
+				"AsyncUsing",
+				cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview,
+				configureDecompiler: settings => { settings.UseEnhancedUsing = false; }
+			);
+		}
+
+		[Test]
+		public async Task RuntimeAsyncCustomTaskType([ValueSource(nameof(roslyn5OrNewerOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary("CustomTaskType", cscOptions: cscOptions | CompilerOptions.EnableRuntimeAsync | CompilerOptions.Preview);
+		}
+
 		[Test]
 		public async Task NullableRefTypes([ValueSource(nameof(roslyn3OrNewerOptions))] CompilerOptions cscOptions)
 		{