Support *ast.SelectorExpr aliases (#881)

* support interface alias

Author: RangelReale

pkg/fixtures/iface_new_type/iface_new_type_test.go

@@ -14,7 +14,7 @@ func TestParsing(t *testing.T) {
 	require.NoError(t, parser.ParsePackages(ctx, []string{"github.com/vektra/mockery/v2/pkg/fixtures/iface_new_type"}))
 	require.NoError(t, parser.Load(ctx))
 
-	for _, ifaceName := range []string{"Interface1", "Interface2", "Interface3"} {
+	for _, ifaceName := range []string{"Interface1", "Interface2", "Interface3", "Interface4"} {
 		iface, err := parser.Find(ifaceName)
 		require.NoError(t, err)
 		require.NotNil(t, iface)
@@ -33,4 +33,8 @@ func TestUsage(t *testing.T) {
 	interface3 := NewMockInterface3(t)
 	interface3.EXPECT().Method1().Return()
 	interface3.Method1()
+
+	interface4 := NewMockInterface4(t)
+	interface4.EXPECT().Method1().Return()
+	interface4.Method1()
 }

pkg/fixtures/iface_new_type/interface.go

@@ -9,4 +9,5 @@ type Interface1 interface {
 type (
 	Interface2 Interface1
 	Interface3 subpkg.SubPkgInterface
+	Interface4 = subpkg.SubPkgInterface
 )

pkg/fixtures/iface_new_type/mock_interface_4_test.go

@@ -247,12 +247,24 @@ func (p *Parser) packageInterfaces(
 			continue
 		}
 
-		typ, ok := obj.Type().(*types.Named)
+		var typ *types.Named
+		var name string
+
+		ttyp := obj.Type()
+
+		if talias, ok := obj.Type().(*types.Alias); ok {
+			name = talias.Obj().Name()
+			ttyp = types.Unalias(obj.Type())
+		}
+
+		typ, ok := ttyp.(*types.Named)
 		if !ok {
 			continue
 		}
 
-		name = typ.Obj().Name()
+		if name == "" {
+			name = typ.Obj().Name()
+		}
 
 		if typ.Obj().Pkg() == nil {
 			continue