config: Append works with modules

config/append.go

@@ -29,6 +29,13 @@ func Append(c1, c2 *Config) (*Config, error) {
 		}
 	}
 
+	if len(c1.Modules) > 0 || len(c2.Modules) > 0 {
+		c.Modules = make(
+			[]*Module, 0, len(c1.Modules)+len(c2.Modules))
+		c.Modules = append(c.Modules, c1.Modules...)
+		c.Modules = append(c.Modules, c2.Modules...)
+	}
+
 	if len(c1.Outputs) > 0 || len(c2.Outputs) > 0 {
 		c.Outputs = make(
 			[]*Output, 0, len(c1.Outputs)+len(c2.Outputs))

config/append_test.go

@@ -12,6 +12,9 @@ func TestAppend(t *testing.T) {
 	}{
 		{
 			&Config{
+				Modules: []*Module{
+					&Module{Name: "foo"},
+				},
 				Outputs: []*Output{
 					&Output{Name: "foo"},
 				},
@@ -29,6 +32,9 @@ func TestAppend(t *testing.T) {
 			},
 
 			&Config{
+				Modules: []*Module{
+					&Module{Name: "bar"},
+				},
 				Outputs: []*Output{
 					&Output{Name: "bar"},
 				},
@@ -46,6 +52,10 @@ func TestAppend(t *testing.T) {
 			},
 
 			&Config{
+				Modules: []*Module{
+					&Module{Name: "foo"},
+					&Module{Name: "bar"},
+				},
 				Outputs: []*Output{
 					&Output{Name: "foo"},
 					&Output{Name: "bar"},