diff --git a/build.ps1 b/build.ps1
index 844da81e..9a0c73cd 100755
--- a/build.ps1
+++ b/build.ps1
@@ -55,20 +55,14 @@ exec dotnet pack --no-restore --no-build --configuration $Configuration -o $arti
 exec dotnet build --configuration $Configuration "$PSScriptRoot/docs/samples/samples.sln"
 
 [string[]] $testArgs=@()
-if ($PSVersionTable.PSEdition -eq 'Core' -and -not $IsWindows) {
-    $testArgs += '--framework','netcoreapp2.2'
+if (-not $IsWindows) {
+    $testArgs += '-p:TestFullFramework=false'
 }
 if ($env:TF_BUILD) {
     $testArgs += '--logger', 'trx'
 }
 
-exec dotnet test --no-restore --no-build --configuration $Configuration '-clp:Summary' `
-    "$PSScriptRoot/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj" `
-    @testArgs `
-    @MSBuildArgs
-
-exec dotnet test --no-restore --no-build --configuration $Configuration '-clp:Summary' `
-    "$PSScriptRoot/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj" `
+exec dotnet test --no-restore --no-build --configuration $Configuration `
     @testArgs `
     @MSBuildArgs
 
diff --git a/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj b/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
index bad23716..334b1662 100644
--- a/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
+++ b/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.2;net472</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.0;netcoreapp2.2</TargetFrameworks>
+    <TargetFrameworks Condition="'$(TestFullFramework)' != 'false'">$(TargetFrameworks);net472</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/CommandLineUtils.Tests/OptionAttributeTests.cs b/test/CommandLineUtils.Tests/OptionAttributeTests.cs
index 635181f3..cd2e6c69 100644
--- a/test/CommandLineUtils.Tests/OptionAttributeTests.cs
+++ b/test/CommandLineUtils.Tests/OptionAttributeTests.cs
@@ -241,12 +241,16 @@ public void BindsToStaticProperties()
             Assert.Equal(1, PrivateSetterProgram.StaticNumber);
         }
 
+#if !NETCOREAPP3_0
+        // .NET Core 3.0 made an intentional breaking change
+        // see https://github.com/dotnet/coreclr/issues/21268
         [Fact]
         public void BindsToStaticReadOnlyProps()
         {
             CommandLineParser.ParseArgs<PrivateSetterProgram>("--static-string", "1");
             Assert.Equal("1", PrivateSetterProgram.StaticString);
         }
+#endif
 
         [Fact]
         public void BindsToStaticPropertiesWithSetterMethod()
diff --git a/test/CommandLineUtils.Tests/ValueParserProviderTests.cs b/test/CommandLineUtils.Tests/ValueParserProviderTests.cs
index a7095d3e..b48676ae 100644
--- a/test/CommandLineUtils.Tests/ValueParserProviderTests.cs
+++ b/test/CommandLineUtils.Tests/ValueParserProviderTests.cs
@@ -415,7 +415,7 @@ public void ParsesValueTupleOfBoolAndEnum(string input, Color expected)
         [InlineData(Color.Green)]
         public void ParsesNullableEnum(Color? color)
         {
-            var parsed = CommandLineParser.ParseArgs<Program>("--color-opt", color.ToString().ToLowerInvariant());
+            var parsed = CommandLineParser.ParseArgs<Program>("--color-opt", color!.ToString()!.ToLowerInvariant());
             Assert.True(parsed.ColorOpt.HasValue, "Option should have value");
             Assert.Equal(color, parsed.ColorOpt);
         }
@@ -491,7 +491,7 @@ public void DefaultCultureCanBeChanged(string property, string option, string te
             app.Conventions.UseAttributes();
             app.Parse(option, test);
 
-            var actual = typeof(Program).GetProperty(property).GetMethod.Invoke(app.Model, null);
+            var actual = typeof(Program).GetProperty(property)!.GetMethod!.Invoke(app.Model, null);
             Assert.Equal(expected, actual);
         }
 
@@ -569,7 +569,7 @@ public void ItParsesParamofT(Type type, string input, object expected)
                 };
 
         private static readonly MethodInfo s_ItParsesOptionOfTImpl
-                  = typeof(ValueParserProviderTests).GetMethod(nameof(ItParsesOptionOfTImpl), BindingFlags.NonPublic | BindingFlags.Instance);
+                  = typeof(ValueParserProviderTests).GetMethod(nameof(ItParsesOptionOfTImpl), BindingFlags.NonPublic | BindingFlags.Instance)!;
 
         private void ItParsesOptionOfTImpl<T>(string input, T expected)
         {
@@ -581,7 +581,7 @@ private void ItParsesOptionOfTImpl<T>(string input, T expected)
         }
 
         private static readonly MethodInfo s_ItParsesArgumentOfTImpl
-                  = typeof(ValueParserProviderTests).GetMethod(nameof(ItParsesArgumentOfTImpl), BindingFlags.NonPublic | BindingFlags.Instance);
+                  = typeof(ValueParserProviderTests).GetMethod(nameof(ItParsesArgumentOfTImpl), BindingFlags.NonPublic | BindingFlags.Instance)!;
 
         private void ItParsesArgumentOfTImpl<T>(string input, T expected)
         {
diff --git a/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj b/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
index a873a47f..19c43fdf 100644
--- a/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
+++ b/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.2;net472</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.0;netcoreapp2.2</TargetFrameworks>
+    <TargetFrameworks Condition="'$(TestFullFramework)' != 'false'">$(TargetFrameworks);net472</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>