成本查询限窗过滤;桶级 PAR 放开列举

internal/service/usage_test.go

@@ -101,6 +101,40 @@ func TestApplyCostDefaults(t *testing.T) {
 	}
 }
 
+func TestFilterCostWindow(t *testing.T) {
+	hour := func(h int) *time.Time {
+		ts := time.Date(2026, 7, 20, h, 0, 0, 0, time.UTC)
+		return &ts
+	}
+	start := time.Date(2026, 7, 20, 16, 0, 0, 0, time.UTC)
+	end := time.Date(2026, 7, 21, 0, 0, 0, 0, time.UTC)
+	tests := []struct {
+		name  string
+		items []oci.CostItem
+		want  int
+	}{
+		{name: "空输入", items: []oci.CostItem{}, want: 0},
+		{name: "窗口前的整日下扩数据被丢弃", items: []oci.CostItem{{TimeStart: hour(0)}, {TimeStart: hour(15)}}, want: 0},
+		{name: "起点边界含", items: []oci.CostItem{{TimeStart: hour(16)}}, want: 1},
+		{name: "终点边界不含", items: []oci.CostItem{{TimeStart: &end}}, want: 0},
+		{name: "TimeStart 缺失丢弃", items: []oci.CostItem{{TimeStart: nil}}, want: 0},
+		{name: "窗口内外混合只留窗口内", items: []oci.CostItem{{TimeStart: hour(2)}, {TimeStart: hour(16)}, {TimeStart: hour(23)}, {TimeStart: &end}}, want: 2},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := filterCostWindow(tt.items, start, end)
+			if len(got) != tt.want {
+				t.Errorf("filterCostWindow() kept %d rows, want %d", len(got), tt.want)
+			}
+			for _, it := range got {
+				if it.TimeStart.Before(start) || !it.TimeStart.Before(end) {
+					t.Errorf("row %v outside window [%v, %v)", it.TimeStart, start, end)
+				}
+			}
+		})
+	}
+}
+
 func TestValidateEmails(t *testing.T) {
 	tests := []struct {
 		name    string