feat(v2): money 包 int64 最小单位 + 币种码(CNY/USD/USDT)

internal/money/money_test.go

@@ -0,0 +1,47 @@
+package money_test
+
+import (
+	"testing"
+
+	"github.com/wangjia/pay/internal/money"
+)
+
+func TestParseFormatRoundTrip(t *testing.T) {
+	cases := []struct {
+		s, cur string
+		minor  int64
+	}{
+		{"12.3417", "USDT", 12341700},
+		{"0.01", "CNY", 1},
+		{"29.99", "USD", 2999},
+		{"199.99", "CNY", 19999},
+		{"1", "USDT", 1000000},
+	}
+	for _, c := range cases {
+		got, err := money.Parse(c.s, c.cur)
+		if err != nil || got != c.minor {
+			t.Fatalf("Parse(%q,%s)=%d,%v want %d", c.s, c.cur, got, err, c.minor)
+		}
+		back, err := money.Format(c.minor, c.cur)
+		if err != nil {
+			t.Fatalf("Format(%d,%s): %v", c.minor, c.cur, err)
+		}
+		// round-trip 回同一 minor(去尾零后可能字符串不同,再 Parse 校验)
+		again, _ := money.Parse(back, c.cur)
+		if again != c.minor {
+			t.Fatalf("round-trip %d → %q → %d", c.minor, back, again)
+		}
+	}
+}
+
+func TestParseErrors(t *testing.T) {
+	if _, err := money.Parse("1.00", "JPYX"); err == nil {
+		t.Fatal("未知币种应报错")
+	}
+	if _, err := money.Parse("0.001", "CNY"); err == nil {
+		t.Fatal("超精度(CNY 3 位小数)应报错")
+	}
+	if _, err := money.Parse("abc", "CNY"); err == nil {
+		t.Fatal("非数字应报错")
+	}
+}