chore: 并入 iotlcm-worker-svr 历史到 worker-svr/（原提交 96f0f4e）

worker-svr/internal/repository/unsub/refund_test.go

@@ -0,0 +1,37 @@
+package unsub
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+func TestCalculateRefundRatio(t *testing.T) {
+	effective := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)
+	cases := []struct {
+		name   string
+		cutoff time.Time
+		want   float64
+	}{
+		{name: "before effective refunds all", cutoff: effective.Add(-time.Hour), want: 1},
+		{name: "half paid period", cutoff: time.Date(2026, 7, 1, 0, 0, 0, 0, time.UTC), want: 184.0 / 365.0},
+		{name: "during gift period refunds none", cutoff: time.Date(2027, 2, 1, 0, 0, 0, 0, time.UTC), want: 0},
+		{name: "after paid period refunds none", cutoff: time.Date(2027, 1, 1, 0, 0, 0, 0, time.UTC), want: 0},
+	}
+	for _, testCase := range cases {
+		t.Run(testCase.name, func(t *testing.T) {
+			got := calculateRefundRatio(effective, testCase.cutoff, 12)
+			if math.Abs(got-testCase.want) > 0.000001 {
+				t.Fatalf("calculateRefundRatio() = %v, want %v", got, testCase.want)
+			}
+		})
+	}
+}
+
+func TestAddRefundMonthsClampsMonthEnd(t *testing.T) {
+	got := addRefundMonths(time.Date(2026, 1, 31, 12, 0, 0, 0, time.UTC), 1)
+	want := time.Date(2026, 2, 28, 12, 0, 0, 0, time.UTC)
+	if !got.Equal(want) {
+		t.Fatalf("addRefundMonths() = %v, want %v", got, want)
+	}
+}