Add GetCounties to county database

- Also remove mutex, as the database is only modified on initialization

test/source/scwx/qt/config/county_database.test.cpp

@@ -15,6 +15,12 @@ class CountyDatabaseTest :
    virtual void SetUp() { scwx::qt::config::CountyDatabase::Initialize(); }
 };
 
+class CountyCountTest :
+    public testing::TestWithParam<std::pair<std::string, std::size_t>>
+{
+   virtual void SetUp() { scwx::qt::config::CountyDatabase::Initialize(); }
+};
+
 TEST_P(CountyDatabaseTest, CountyName)
 {
    auto& [id, name] = GetParam();
@@ -24,6 +30,15 @@ TEST_P(CountyDatabaseTest, CountyName)
    EXPECT_EQ(actualName, name);
 }
 
+TEST_P(CountyCountTest, State)
+{
+   auto& [state, size] = GetParam();
+
+   auto counties = CountyDatabase::GetCounties(state);
+
+   EXPECT_EQ(counties.size(), size);
+}
+
 INSTANTIATE_TEST_SUITE_P(
    CountyDatabase,
    CountyDatabaseTest,
@@ -33,6 +48,14 @@ INSTANTIATE_TEST_SUITE_P(
                    std::make_pair("GMZ335", "Galveston Bay"),
                    std::make_pair("ANZ338", "New York Harbor")));
 
+INSTANTIATE_TEST_SUITE_P(CountyDatabase,
+                         CountyCountTest,
+                         testing::Values(std::make_pair("AZ", 15),
+                                         std::make_pair("MO", 115),
+                                         std::make_pair("TX", 254),
+                                         std::make_pair("GM", 0),
+                                         std::make_pair("AN", 0)));
+
 } // namespace config
 } // namespace qt
 } // namespace scwx