Change ResolveURL to work as a fmt.Sprintf

httpfake.go

@@ -6,6 +6,7 @@
 package httpfake
 
 import (
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -48,8 +49,9 @@ func (f *HTTPFake) NewHandler() *Request {
 }
 
 // ResolveURL resolves the full URL to the fake server for a given path
-func (f *HTTPFake) ResolveURL(path string) string {
-	return f.Server.URL + path
+func (f *HTTPFake) ResolveURL(path string, args ...interface{}) string {
+	format := f.Server.URL + path
+	return fmt.Sprintf(format, args...)
 }
 
 // Reset wipes the request handlers definitions

httpfake_test.go

@@ -0,0 +1,34 @@
+package httpfake
+
+import (
+	"testing"
+)
+
+func TestResolveURL(t *testing.T) {
+	fakeService := New()
+	defer fakeService.Server.Close()
+
+	testCases := []struct {
+		resolved string
+		expected string
+	}{
+		{
+			resolved: fakeService.ResolveURL("/users"),
+			expected: fakeService.Server.URL + "/users",
+		},
+		{
+			resolved: fakeService.ResolveURL("/users/%v", 1),
+			expected: fakeService.Server.URL + "/users/1",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run("ResolveURL", func(t *testing.T) {
+			if tc.resolved != tc.expected {
+				t.Errorf("returned unexpected URL: got %v want %v",
+					tc.resolved, tc.expected)
+			}
+		})
+	}
+
+}