test: add url_search_params::to_string tests

Author: anonrig

include/ada/url_search_params.h

@@ -61,7 +61,10 @@ struct url_search_params {
    */
   inline void sort() const noexcept;
 
-  inline std::string to_string();
+  /**
+   * @see https://url.spec.whatwg.org/#urlsearchparams-stringification-behavior
+   */
+  std::string to_string();
 
  private:
   uint32_t size{0};

src/url_search_params.cpp

@@ -39,11 +39,8 @@ inline void url_search_params::set(const std::string_view key,
   params.emplace_back(std::string(key), std::string(value));
 }
 
-inline std::string url_search_params::to_string() {
-  if (params.empty()) {
-    return "";
-  }
-  std::string out = "?";
+std::string url_search_params::to_string() {
+  std::string out{};
   for (size_t i = 0; i < params.size(); i++) {
     auto param = params[i];
     auto key = std::get<0>(param);

tests/url_search_params.cpp

@@ -11,3 +11,12 @@ TEST(url_search_params, append) {
   ASSERT_EQ(search_params.get_all("key").size(), 2);
   SUCCEED();
 }
+
+TEST(url_search_params, to_string) {
+  auto search_params = ada::url_search_params();
+  search_params.append("key1", "value1");
+  search_params.append("key2", "value2");
+  ASSERT_EQ(search_params.get_size(), 2);
+  ASSERT_EQ(search_params.to_string(), "key1=value1&key2=value2");
+  SUCCEED();
+}