new test cases for article

test/test_article.cpp

@@ -0,0 +1,21 @@
+#define BOOST_TEST_MODULE article
+
+#include "../src/core/article.h"
+
+#include <boost/test/included/unit_test.hpp>
+
+BOOST_AUTO_TEST_CASE(create_article)
+{
+    Article article{};
+    BOOST_TEST(article.getUuid().is_nil() == true);
+}
+
+BOOST_AUTO_TEST_CASE(check_is_sold)
+{
+    Article article{};
+    BOOST_TEST(article.isSold() == false);
+
+    auto salePtr = std::make_shared<Sale>();
+    article.setSale(salePtr);
+    BOOST_TEST(article.isSold() == true);
+}