Introduce ClassAutoNSubstituteDataAttribute

src/Atc.Test/ClassAutoNSubstituteDataAttribute.cs

@@ -0,0 +1,50 @@
+namespace Atc.Test;
+
+/// <summary>
+/// Provides a data source for a data theory, with the data coming from
+/// a class implementing IEnumerable&lt;object[]&gt;, combined with auto-generated data
+/// specimens generated by AutoFixture and NSubstitute.
+/// </summary>
+[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
+public sealed class ClassAutoNSubstituteDataAttribute : ClassDataAttribute
+{
+    public ClassAutoNSubstituteDataAttribute(Type @class)
+        : base(@class)
+    {
+    }
+
+    public override IEnumerable<object[]> GetData(MethodInfo testMethod)
+    {
+        var data = base.GetData(testMethod);
+        foreach (var values in data)
+        {
+            var fixture = FixtureFactory.Create();
+            yield return values
+                .Concat(testMethod
+                    .GetParameters()
+                    .Skip(values.Length)
+                    .Select(p => GetSpecimen(fixture, p)))
+                .ToArray();
+        }
+    }
+
+    private static object GetSpecimen(
+        IFixture fixture,
+        ParameterInfo parameter)
+    {
+        var attributes = parameter
+            .GetCustomAttributes()
+            .OfType<IParameterCustomizationSource>()
+            .OrderBy(x => x is FrozenAttribute);
+
+        foreach (var attribute in attributes)
+        {
+            attribute
+                .GetCustomization(parameter)
+                .Customize(fixture);
+        }
+
+        return new SpecimenContext(fixture)
+            .Resolve(parameter);
+    }
+}

src/Atc.Test/MemberAutoNSubstituteDataAttribute.cs

@@ -3,7 +3,7 @@ namespace Atc.Test;
 /// <summary>
 /// Provides a data source for a data theory, with the data coming from
 /// one of the following sources and combined with auto-generated data
-/// specimens generated by AutoFixture and NSubstitute:
+/// specimens generated by AutoFixture and NSubstitute.
 /// <list type="number">
 /// <item>A static property</item>
 /// <item>A static field</item>