Install NUnit.Analyzers package (#643)

+semver:patch

Author: hazzik

.editorconfig

@@ -18,6 +18,7 @@ insert_final_newline = true
 csharp_style_namespace_declarations = file_scoped
 
 dotnet_diagnostic.ide0161.severity = warning
+dotnet_diagnostic.NUnit1032.severity = suggestion
 
 # ReSharper properties
 resharper_default_private_modifier = implicit

src/FluentNHibernate.Testing/FluentNHibernate.Testing.csproj

@@ -22,6 +22,10 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="FakeItEasy" Version="8.1.0" />
     <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.0.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="System.Data.SQLite.Core" Version="1.0.118" />
   </ItemGroup>

src/FluentNHibernate.Testing/Testing/XmlWriterTestHelper.cs

@@ -99,10 +99,9 @@ internal void Check(XmlDocument document)
                     document.OutputXmlToConsole();
 
                 Assert.That(areEqual,
-                    "Property '{0}' was set to '{1}' and was expected to be written to attribute '{2}' with value '{3}'. The value was instead '{4}'",
-                    sourceProperty.InnerMember.MemberInfo.ReflectedType.Name + "." + sourceProperty.Name,
-                    sourceValue, check.Key, check.Value, attributeValue
-                );
+                    $"Property '{sourceProperty.InnerMember.MemberInfo.ReflectedType?.Name}.{sourceProperty.Name}' was set to '{sourceValue}' " +
+                    $"and was expected to be written to attribute '{check.Key}' with value '{check.Value}'. " +
+                    $"The value was instead '{attributeValue}'");
                 //string.Equals()
                 //rootElement.AttributeShouldEqual(check.Key, check.Value.ToString());
                 //rootElement.Attributes[check.Key].Value.ShouldBeEqualIgnoringCase(check.Value.ToString());