allow not setting base currency

cache_test.go

@@ -2,7 +2,7 @@ package dinero
 
 import (
 	"encoding/json"
-	"os"
+	"strings"
 	"testing"
 	"time"
 
@@ -12,14 +12,17 @@ import (
 // TestCache will test that our in-memory cache of forex results is working.
 func TestCache(t *testing.T) {
 	// Register the test.
-	RegisterTestingT(t)
+	NewWithT(t)
 
 	// Init dinero client.
-	client := NewClient(os.Getenv("OPEN_EXCHANGE_APP_ID"), "AUD", 1*time.Minute)
+	client := NewClient(appID, "AUD", 1*time.Minute)
 
 	// Get latest forex rates.
 	response1, err := client.Rates.List()
 	if err != nil {
+		if strings.HasPrefix(err.Error(), setBaseNotAllowedResponsePrefix) {
+			t.Skipf("skipping test, unsuitable app ID: %s", err)
+		}
 		t.Fatalf("Unexpected error running client.Rates.List(): %s", err.Error())
 	}
 

dinero.go

@@ -65,10 +65,12 @@ func NewClient(appID, baseCurrency string, expiry time.Duration) *Client {
 
 // NewRequest creates an authenticated API request. A relative URL can be provided in urlPath,
 // which will be resolved to the BackendURL of the Client.
-func (c *Client) NewRequest(method, urlPath string, body interface{}) (*http.Request, error) {
+func (c *Client) NewRequest(method, urlPath string, params url.Values, body interface{}) (*http.Request, error) {
+	// make sure rendered URL is correct whether we have other params than app_id or not
+	params.Set("app_id", c.AppID)
 	// Parse our URL.
 	rel, err := url.Parse(
-		fmt.Sprintf("/api/%s&app_id=%s", urlPath, c.AppID),
+		fmt.Sprintf("/api/%s?%s", urlPath, params.Encode()),
 	)
 	if err != nil {
 		return nil, err

dinero_test.go

@@ -0,0 +1,42 @@
+package dinero
+
+import (
+	"net/url"
+	"testing"
+	"time"
+
+	. "github.com/onsi/gomega"
+)
+
+func TestNewRequest(t *testing.T) {
+	// Register the test.
+	NewWithT(t)
+
+	// Init dinero client.
+	client := NewClient("12345", "", 1*time.Minute)
+
+	var tests = []struct {
+		params      url.Values
+		expectedURL string
+	}{
+		{
+			params:      url.Values{},
+			expectedURL: "https://openexchangerates.org/api/latest.json?app_id=12345",
+		},
+		{
+			params:      url.Values{"base": []string{"AUD"}},
+			expectedURL: "https://openexchangerates.org/api/latest.json?app_id=12345&base=AUD",
+		},
+	}
+
+	for _, test := range tests {
+		req, err := client.NewRequest("GET", "latest.json", test.params, nil)
+		if err != nil {
+			t.Fatal(err)
+		}
+		actual := req.URL.String()
+		if actual != test.expectedURL {
+			t.Errorf("expected %s, got %s", test.expectedURL, actual)
+		}
+	}
+}

rates.go

@@ -2,7 +2,7 @@ package dinero
 
 import (
 	"errors"
-	"fmt"
+	"net/url"
 )
 
 const (
@@ -21,8 +21,8 @@ func NewRatesService(
 	baseCurrency string,
 ) *RatesService {
 	return &RatesService{
-		client,
-		baseCurrency,
+		client:       client,
+		baseCurrency: baseCurrency,
 	}
 }
 
@@ -42,7 +42,7 @@ func (s *RatesService) List() (*RateResponse, error) {
 	}
 
 	// No cached results, go and fetch them.
-	if err := s.Update(s.baseCurrency); err != nil {
+	if err := s.Update(); err != nil {
 		return nil, err
 	}
 
@@ -64,35 +64,39 @@ func (s *RatesService) Get(code string) (*float64, error) {
 	}
 
 	// No cached results, go and fetch them.
-	if err := s.Update(s.baseCurrency); err != nil {
+	if err := s.Update(); err != nil {
 		return nil, err
 	}
 
 	return s.Get(code)
 }
 
 // Update will update the rates for the given currency from OXR.
-func (s *RatesService) Update(base string) error {
-	if base == "" {
-		return errors.New("base currency provided cannot be empty")
-	}
-
+func (s *RatesService) Update() error {
 	// Build request.
+	// add `base` query param if it is not empty
+	params := url.Values{}
+	if s.baseCurrency != "" {
+		params.Set("base", s.baseCurrency)
+	}
 	request, err := s.client.NewRequest(
 		"GET",
-		fmt.Sprintf("%s?base=%s", latestAPIPath, base),
+		latestAPIPath,
+		params,
 		nil,
 	)
 	if err != nil {
 		return err
 	}
 
 	// Make request
-	latest := &RateResponse{}
-	if _, err = s.client.Do(request, latest); err != nil {
+	var latest *RateResponse
+	if _, err := s.client.Do(request, &latest); err != nil {
 		return err
 	}
 
+	s.SetBaseCurrency(latest.Base)
+
 	// Store our results.
 	s.client.Cache.Store(latest)
 

rates_test.go

@@ -3,47 +3,106 @@ package dinero
 import (
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 	"time"
 
 	. "github.com/onsi/gomega"
 )
 
+const (
+	// Default currency returned by API calls that do not set a base currency.
+	defaultCurrency = "USD"
+	// > 403 Changing the API `base` currency is available for Developer, Enterprise and Unlimited plan clients.
+	setBaseNotAllowedResponsePrefix = "403"
+)
+
+var appID = os.Getenv("OPEN_EXCHANGE_APP_ID")
+
+// TestListRatesDefaultCurrency will test updating our local store of forex rates from the OXR API expecting rates for defaultCurrency.
+func TestListRatesDefaultCurrency(t *testing.T) {
+	// Register the test.
+	NewWithT(t)
+
+	// Init dinero client.
+	client := NewClient(appID, "", 1*time.Minute)
+
+	// Get latest forex rates.
+	response, err := client.Rates.List()
+	if err != nil {
+		t.Fatalf("Unexpected error running client.Rates.List(): %s", err)
+	}
+
+	if response.Base != defaultCurrency {
+		t.Fatalf("Unexpected base oxr rate: Expecting `%s`.", defaultCurrency)
+	}
+
+	if response.Rates == nil {
+		t.Fatal("Unexpected nil length of rates")
+	}
+}
+
+// TestGetRateDefaultCurrency will test pulling a single rate for defaultCurrency.
+func TestGetRateDefaultCurrency(t *testing.T) {
+	// Register the test.
+	NewWithT(t)
+
+	// Init dinero client.
+	client := NewClient(appID, "", 1*time.Minute)
+
+	// Get latest forex rates for NZD (using defaultCurrency as a base).
+	response, err := client.Rates.Get("NZD")
+	if err != nil {
+		t.Fatalf("Unexpected error running client.Rates.Get('NZD'): %s", err)
+	}
+
+	// Did we get a *float64 back?
+	if reflect.TypeOf(response).String() != "*float64" {
+		t.Fatalf("Unexpected rate datatype, expected float64 got %T", response)
+	}
+}
+
 // TestListRates will test updating our local store of forex rates from the OXR API.
 func TestListRates(t *testing.T) {
 	// Register the test.
-	RegisterTestingT(t)
+	NewWithT(t)
 
 	// Init dinero client.
-	client := NewClient(os.Getenv("OPEN_EXCHANGE_APP_ID"), "AUD", 1*time.Minute)
+	client := NewClient(appID, "AUD", 1*time.Minute)
 
 	// Get latest forex rates.
 	response, err := client.Rates.List()
 	if err != nil {
-		t.Fatalf("Unexpected error running client.Rates.List(): %s", err.Error())
+		if strings.HasPrefix(err.Error(), setBaseNotAllowedResponsePrefix) {
+			t.Skipf("skipping test, unsuitable app ID: %s", err)
+		}
+		t.Fatalf("Unexpected error running client.Rates.List(): %s", err)
 	}
 
 	if response.Base != "AUD" {
-		t.Fatalf("Unexpected base oxr rate: %s. Expecting `AUD`.", err.Error())
+		t.Fatal("Unexpected base oxr rate. Expecting `AUD`.")
 	}
 
 	if response.Rates == nil {
-		t.Fatalf("Unexpected length of rates: %s.", err.Error())
+		t.Fatal("Unexpected length of rates")
 	}
 }
 
 // TestGetRate will test pulling a single rate.
 func TestGetRate(t *testing.T) {
 	// Register the test.
-	RegisterTestingT(t)
+	NewWithT(t)
 
 	// Init dinero client.
-	client := NewClient(os.Getenv("OPEN_EXCHANGE_APP_ID"), "AUD", 1*time.Minute)
+	client := NewClient(appID, "AUD", 1*time.Minute)
 
 	// Get latest forex rates for NZD (using AUD as a base).
 	response, err := client.Rates.Get("NZD")
 	if err != nil {
-		t.Fatalf("Unexpected error running client.Rates.Get('NZD'): %s", err.Error())
+		if strings.HasPrefix(err.Error(), setBaseNotAllowedResponsePrefix) {
+			t.Skipf("skipping test, unsuitable app ID: %s", err)
+		}
+		t.Fatalf("Unexpected error running client.Rates.Get('NZD'): %s", err)
 	}
 
 	// Did we get a *float64 back?