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package exchange
import (
"bytes"
"encoding/json"
"flag"
"log"
"net/url"
"os"
"testing"
"time"
"github.com/google/go-querystring/query"
"github.com/shopspring/decimal"
"github.com/stretchr/testify/require"
)
const (
keyFile = ".key"
// $1 CAD ≅ 70¢ USD (±20%)
// This is the rate at the time of writing. It may need to be
// changed later if something drastic occurs in either country.
usdPerCad = 0.70
rateEpsilon = 0.20
floatEpsilon = 1e-7
)
var apiKey string
func TestMain(m *testing.M) {
flag.BoolVar(&debug, "debug", false, "log debug info to stderr")
flag.Parse()
// Load API key
buf, err := os.ReadFile(keyFile)
if err != nil {
log.Fatalf("error loading API key: %v\n", err)
}
apiKey = string(bytes.TrimSpace(buf))
m.Run()
}
func TestUnmarshalApiError(t *testing.T) {
data := `
{
"status": {
"timestamp": "2018-06-02T22:51:28.209Z",
"error_code": 1002,
"error_message": "API key missing.",
"elapsed": 10,
"credit_count": 0
}
}
`
want := apiError{
status{"API key missing."},
}
var info apiError
err := json.Unmarshal([]byte(data), &info)
require.NoError(t, err)
require.Equal(t, want, info)
}
func TestPriceConversionQuery(t *testing.T) {
q := priceConversionQuery{123, "USD", "CAD"}
want := url.Values{
"amount": {"123"},
"symbol": {"USD"},
"convert": {"CAD"},
}
vals, err := query.Values(q)
require.NoError(t, err)
require.Equal(t, want, vals)
}
func TestUnmarshalPriceConversionResponse(t *testing.T) {
data := `
{
"data": [
{
"id": 32134,
"symbol": "CAD",
"name": "Caduceus Protocol (new)",
"amount": 1,
"quote": {
"USD": {
"price": 0.00026617250802605987,
"last_updated": "2026-07-09T17:31:05.000Z"
}
},
"last_updated": "2026-07-09T17:30:00.000Z"
},
{
"id": 2784,
"symbol": "CAD",
"name": "Canadian Dollar",
"amount": 1,
"quote": {
"USD": {
"price": 0.7060965078585,
"last_updated": "2026-07-09T17:31:05.000Z"
}
},
"last_updated": "2026-07-09T17:31:05.000Z"
}
],
"status": {
"timestamp": "2026-07-09T17:32:29.378Z",
"error_code": 0,
"error_message": null,
"elapsed": 25,
"credit_count": 1,
"notice": null
}
}
`
want := response[[]priceConversion]{
Data: []priceConversion{
{
32134,
map[string]price{
"USD": {decimal.RequireFromString("0.00026617250802605987")},
},
}, {
2784,
map[string]price{
"USD": {decimal.RequireFromString("0.7060965078585")},
},
},
},
}
var conv response[[]priceConversion]
err := json.Unmarshal([]byte(data), &conv)
require.NoError(t, err)
require.Equal(t, want, conv)
}
func TestRateCache(t *testing.T) {
clnt := NewClient(apiKey)
defer clnt.Close()
from, to := "CAD", "USD"
// Repeat to exercise cache
for i := 0; i < 5; i++ {
rate, err := clnt.Rate(from, to)
require.NoError(t, err)
t.Log(rate)
require.InEpsilon(t, usdPerCad, rate.InexactFloat64(), rateEpsilon)
}
}
func TestRateCacheExpire(t *testing.T) {
ttl := time.Millisecond
clnt := NewClient(apiKey, WithTTL(ttl))
defer clnt.Close()
from, to := "CAD", "USD"
check := func() {
rate, err := clnt.Rate(from, to)
require.NoError(t, err)
t.Log(rate)
require.InEpsilon(t, usdPerCad, rate.InexactFloat64(), rateEpsilon)
}
check() // retrieve
time.Sleep(2 * ttl) // expire
check() // refresh
}
func TestRateFiatFiat(t *testing.T) {
testRate(t, "AUD", "CAD")
}
func TestRateFiatCrypto(t *testing.T) {
testRate(t, "CAD", "XMR")
}
func TestRateCryptoCrypto(t *testing.T) {
testRate(t, "XMR", "BTC")
}
func testRate(t *testing.T, from, to string) {
c := NewClient(apiKey)
defer c.Close()
aPerB := rate(t, c, from, to)
bPerA := rate(t, c, to, from)
require.NotZero(t, aPerB)
require.NotZero(t, bPerA)
require.InEpsilon(t, bPerA.InexactFloat64(), decimal.NewFromInt(1).Div(aPerB).InexactFloat64(), floatEpsilon)
}
func rate(t *testing.T, c *Client, from, to string) decimal.Decimal {
t.Helper()
rate, err := c.Rate(from, to)
require.NoError(t, err)
t.Logf("1 %s = %v %s\n", from, rate, to)
return rate
}
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