feat: generate code for derived non refit methods.

InterfaceStubGenerator.Shared/Parser.cs

@@ -300,7 +300,7 @@ bool nullableEnabled
             .Where(m => IsRefitMethod(m, httpMethodBaseAttributeSymbol))
             .ToArray();
         var derivedNonRefitMethods = derivedMethods
-            .Except(derivedMethods, SymbolEqualityComparer.Default)
+            .Except(derivedRefitMethods, SymbolEqualityComparer.Default)
             .Cast<IMethodSymbol>()
             .ToArray();
 

Refit.GeneratorTests/Incremental/InheritanceTest.cs

@@ -74,7 +74,6 @@ public interface IGitHubApi : IDisposable
     [Fact]
     public void InheritFromInterfaceDoesRegenerate()
     {
-        // TODO: this currently generates invalid code see issue #1801 for more information
         var syntaxTree = CSharpSyntaxTree.ParseText(TwoInterface, CSharpParseOptions.Default);
         var compilation1 = Fixture.CreateLibrary(syntaxTree);
 
@@ -94,6 +93,6 @@ public interface IGitHubApi : IBaseInterface
             """
         );
         var driver2 = driver1.RunGenerators(compilation2);
-        TestHelper.AssertRunReasons(driver2, IncrementalGeneratorRunReasons.Cached);
+        TestHelper.AssertRunReasons(driver2, IncrementalGeneratorRunReasons.Modified);
     }
 }

Refit.GeneratorTests/_snapshots/InterfaceTests.RefitInterfaceDerivedFromBaseTest#IGeneratedInterface.g.verified.cs

@@ -46,6 +46,12 @@ public RefitGeneratorTestIGeneratedInterface(global::System.Net.Http.HttpClient
 
             return await ((global::System.Threading.Tasks.Task<string>)______func(this.Client, ______arguments)).ConfigureAwait(false);
         }
+
+        /// <inheritdoc />
+        void global::RefitGeneratorTest.IBaseInterface.NonRefitMethod()
+        {
+                throw new global::System.NotImplementedException("Either this method has no Refit HTTP method attribute or you've used something other than a string literal for the 'path' argument.");
+        }
     }
     }
 }

Refit.GeneratorTests/_snapshots/InterfaceTests.RefitInterfaceDerivedFromBaseTest.verified.txt

@@ -0,0 +1,14 @@
+{
+  Diagnostics: [
+    {
+      Id: RF001,
+      Title: Refit types must have Refit HTTP method attributes,
+      Severity: Warning,
+      WarningLevel: 1,
+      Location: : (19,9)-(19,23),
+      MessageFormat: Method {0}.{1} either has no Refit HTTP method attribute or you've used something other than a string literal for the 'path' argument,
+      Message: Method IBaseInterface.NonRefitMethod either has no Refit HTTP method attribute or you've used something other than a string literal for the 'path' argument,
+      Category: Refit
+    }
+  ]
+}