Initial commit: 可转债轮动分析系统

- 实时行情：东财push2主源 + 腾讯批量报价备用源（自动切换）
- 历史K线：东财push2his主源 + 腾讯web子域备用源（含熔断机制）
- 增量同步：支持 -incr/-since 参数按存档日期增量入库
- 策略回测：净值曲线/10指标/基准对比，含基本面过滤
- 用户认证：用户名密码 + 邮箱验证码双登录方式
- 前端：三Tab SPA（实时行情/策略回测/数据管理）

internal/strategy/doublelow_test.go

@@ -0,0 +1,152 @@
+package strategy
+
+import (
+	"context"
+	"testing"
+
+	"stock-analysis/internal/backtest"
+)
+
+func TestDoubleLow_Name(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 10, Rebalance: 21, MinPrice: 90, MaxPrice: 130, MaxPremium: 30})
+	name := s.Name()
+	if name == "" {
+		t.Error("strategy name should not be empty")
+	}
+}
+
+func TestDoubleLow_SelectByDoubleLowValue(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 3, Rebalance: 5, MinPrice: 90, MaxPrice: 130, MaxPremium: 30})
+
+	universe := []backtest.Quote{
+		{Code: "A", Price: 100, PremiumRate: 10}, // 双低 = 110
+		{Code: "B", Price: 95, PremiumRate: 5},   // 双低 = 100 (最低)
+		{Code: "C", Price: 110, PremiumRate: 20}, // 双低 = 130
+		{Code: "D", Price: 105, PremiumRate: 8},  // 双低 = 113
+		{Code: "E", Price: 120, PremiumRate: 15}, // 双低 = 135
+	}
+
+	targets, err := s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(targets) != 3 {
+		t.Fatalf("expected 3 targets, got %d", len(targets))
+	}
+
+	// 按双低值排序：B(100), A(110), D(113)
+	codes := make(map[string]bool)
+	for _, tg := range targets {
+		codes[tg.Code] = true
+	}
+	if !codes["B"] || !codes["A"] || !codes["D"] {
+		t.Errorf("expected codes B, A, D, got %v", codes)
+	}
+}
+
+func TestDoubleLow_FilterByPriceRange(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 5, Rebalance: 5, MinPrice: 90, MaxPrice: 130, MaxPremium: 30})
+
+	universe := []backtest.Quote{
+		{Code: "A", Price: 85, PremiumRate: 5},  // 价格过低，过滤
+		{Code: "B", Price: 100, PremiumRate: 10}, // 合格
+		{Code: "C", Price: 135, PremiumRate: 5},  // 价格过高，过滤
+	}
+
+	targets, err := s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(targets) != 1 {
+		t.Fatalf("expected 1 target, got %d", len(targets))
+	}
+	if targets[0].Code != "B" {
+		t.Errorf("expected code B, got %s", targets[0].Code)
+	}
+}
+
+func TestDoubleLow_FilterByPremiumRate(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 5, Rebalance: 5, MinPrice: 90, MaxPrice: 130, MaxPremium: 20})
+
+	universe := []backtest.Quote{
+		{Code: "A", Price: 100, PremiumRate: 15}, // 合格
+		{Code: "B", Price: 100, PremiumRate: 25}, // 溢价过高，过滤
+		{Code: "C", Price: 100, PremiumRate: 0},  // 溢价为0，过滤
+		{Code: "D", Price: 100, PremiumRate: -5}, // 负溢价，过滤
+	}
+
+	targets, err := s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(targets) != 1 {
+		t.Fatalf("expected 1 target, got %d", len(targets))
+	}
+	if targets[0].Code != "A" {
+		t.Errorf("expected code A, got %s", targets[0].Code)
+	}
+}
+
+func TestDoubleLow_NoQualifiedCandidates(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 3, Rebalance: 5, MinPrice: 90, MaxPrice: 130, MaxPremium: 30})
+
+	universe := []backtest.Quote{
+		{Code: "A", Price: 50, PremiumRate: 5},
+		{Code: "B", Price: 200, PremiumRate: 10},
+	}
+
+	targets, err := s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if targets != nil {
+		t.Error("expected nil targets when no qualified candidates")
+	}
+}
+
+func TestDoubleLow_RebalanceCycle(t *testing.T) {
+	s := NewDoubleLow(DoubleLowParams{TopN: 3, Rebalance: 3, MinPrice: 90, MaxPrice: 130, MaxPremium: 30})
+
+	universe := []backtest.Quote{
+		{Code: "A", Price: 100, PremiumRate: 10},
+	}
+
+	// 第 1 天：调仓
+	targets, _ := s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if targets == nil {
+		t.Error("day 1 should rebalance")
+	}
+
+	// 第 2-3 天：不调仓
+	for i := 0; i < 2; i++ {
+		targets, _ = s.OnBar(context.Background(), "2020-01-02", universe, nil)
+		if targets != nil {
+			t.Errorf("day %d should not rebalance", i+2)
+		}
+	}
+
+	// 第 4 天：调仓
+	targets, _ = s.OnBar(context.Background(), "2020-01-02", universe, nil)
+	if targets == nil {
+		t.Error("day 4 should rebalance")
+	}
+}
+
+func TestDefaultDoubleLowParams(t *testing.T) {
+	p := DefaultDoubleLowParams()
+	if p.TopN != 10 {
+		t.Errorf("TopN: expected 10, got %d", p.TopN)
+	}
+	if p.Rebalance != 21 {
+		t.Errorf("Rebalance: expected 21, got %d", p.Rebalance)
+	}
+	if p.MinPrice != 90 {
+		t.Errorf("MinPrice: expected 90, got %f", p.MinPrice)
+	}
+	if p.MaxPrice != 130 {
+		t.Errorf("MaxPrice: expected 130, got %f", p.MaxPrice)
+	}
+	if p.MaxPremium != 30 {
+		t.Errorf("MaxPremium: expected 30, got %f", p.MaxPremium)
+	}
+}