feat: evolve rate-filter to a more generic filter

internal/corecfg/merge_test.go

@@ -3,6 +3,8 @@ package corecfg
 import (
 	"reflect"
 	"testing"
+
+	"gitea.epss.net.cn/klesh/ss/internal/automation"
 )
 
 func TestPopFirstProxyGroup(t *testing.T) {
@@ -72,6 +74,31 @@ func TestMergeProxySelection(t *testing.T) {
 	}
 }
 
+func TestRewritePoppedGroupRef(t *testing.T) {
+	groupRefs := []automation.ProxyRef{
+		{OriginalName: "Auto", DisplayName: "sub-a | Auto", Subscription: "sub-a"},
+		{OriginalName: "AnotherGroup", DisplayName: "sub-a | AnotherGroup", Subscription: "sub-a"},
+	}
+
+	got := rewritePoppedGroupRef(groupRefs)
+
+	if len(got) != 2 {
+		t.Fatalf("expected 2 refs, got %#v", got)
+	}
+	if got[0].DisplayName != selectionGroupName || got[0].OriginalName != "Auto" {
+		t.Fatalf("expected the popped group's DisplayName rewritten to %q, got %#v", selectionGroupName, got[0])
+	}
+	if got[1].DisplayName != "sub-a | AnotherGroup" {
+		t.Fatalf("expected the non-popped group left untouched, got %#v", got[1])
+	}
+}
+
+func TestRewritePoppedGroupRefEmpty(t *testing.T) {
+	if got := rewritePoppedGroupRef(nil); len(got) != 0 {
+		t.Fatalf("expected no-op on empty input, got %#v", got)
+	}
+}
+
 func TestMergeProxySelectionNoGroups(t *testing.T) {
 	combined := map[string]interface{}{"proxy-groups": []interface{}{"unchanged"}}
 	mergeProxySelection(combined, nil)