2 files changed, 7 insertions, 5 deletions

diff --git a/appveyor.cmd b/appveyor.cmd
index 0cf8062c..98506de8 100644
--- a/appveyor.cmd
+++ b/appveyor.cmd
@@ -12,6 +12,8 @@ nuget restore || exit /b
 msbuild -p:Configuration=%_C% || exit /b
 
 :: Test
+dotnet test -c %_C% --no-build src\test\WixToolsetTest.BuildTasks || exit /b
+
 dotnet publish -c %_C% -o %_P%\dotnet-wix\ -f netcoreapp2.1 src\wix || exit /b
 
 dotnet publish -c %_C% -o %_P%\WixToolset.Sdk\separate\net461\x86\buildtasks\ -f net461 -r win-x86 src\WixToolset.BuildTasks || exit /b
diff --git a/src/test/WixToolsetTest.Sdk/MsbuildHeatFixture.cs b/src/test/WixToolsetTest.Sdk/MsbuildHeatFixture.cs
index 10840c56..8b2e8e3d 100644
--- a/src/test/WixToolsetTest.Sdk/MsbuildHeatFixture.cs
+++ b/src/test/WixToolsetTest.Sdk/MsbuildHeatFixture.cs
@@ -66,7 +66,7 @@ namespace WixToolsetTest.Sdk
                 var section = intermediate.Sections.Single();
 
                 var fileSymbol = section.Symbols.OfType<FileSymbol>().Single();
-                Assert.Equal(@"SourceDir\HeatFilePackage.wixproj", fileSymbol[FileSymbolFields.Source].PreviousValue.AsPath().Path);
+                Assert.Equal(@"SourceDir\HeatFilePackage.wixproj", fileSymbol[FileSymbolFields.Source].PreviousValue.AsPath()?.Path);
             }
         }
 
@@ -142,8 +142,8 @@ namespace WixToolsetTest.Sdk
                 var section = intermediate.Sections.Single();
 
                 var fileSymbols = section.Symbols.OfType<FileSymbol>().ToArray();
-                Assert.Equal(@"SourceDir\MyProgram.txt", fileSymbols[0][FileSymbolFields.Source].PreviousValue.AsPath().Path);
-                Assert.Equal(@"SourceDir\MyProgram.json", fileSymbols[1][FileSymbolFields.Source].PreviousValue.AsPath().Path);
+                Assert.Equal(@"SourceDir\MyProgram.txt", fileSymbols[0][FileSymbolFields.Source].PreviousValue.AsPath()?.Path);
+                Assert.Equal(@"SourceDir\MyProgram.json", fileSymbols[1][FileSymbolFields.Source].PreviousValue.AsPath()?.Path);
             }
         }
 
@@ -253,7 +253,7 @@ namespace WixToolsetTest.Sdk
                 var section = intermediate.Sections.Single();
 
                 var fileSymbol = section.Symbols.OfType<FileSymbol>().Single();
-                Assert.Equal(Path.Combine(fs.BaseFolder, "ToolsVersion4Cs", "bin", "Release\\\\ToolsVersion4Cs.dll"), fileSymbol[FileSymbolFields.Source].PreviousValue.AsPath().Path);
+                Assert.Equal(Path.Combine(fs.BaseFolder, "ToolsVersion4Cs", "bin", "Release\\\\ToolsVersion4Cs.dll"), fileSymbol[FileSymbolFields.Source].AsPath()?.Path);
             }
         }
 
@@ -368,7 +368,7 @@ namespace WixToolsetTest.Sdk
                 var section = intermediate.Sections.Single();
 
                 var fileSymbol = section.Symbols.OfType<FileSymbol>().Single();
-                Assert.Equal(Path.Combine(fs.BaseFolder, "SdkStyleCs", "bin", "Release", "netstandard2.0\\\\SdkStyleCs.dll"), fileSymbol[FileSymbolFields.Source].PreviousValue.AsPath().Path);
+                Assert.Equal(Path.Combine(fs.BaseFolder, "SdkStyleCs", "bin", "Release", "netstandard2.0\\\\SdkStyleCs.dll"), fileSymbol[FileSymbolFields.Source].AsPath()?.Path);
             }
         }
     }