added test for session insert

test/backends/SessionInsertHasMany.cpp

@@ -0,0 +1,30 @@
+#include "catch2/catch_test_macros.hpp"
+
+#include "SessionFixture.hpp"
+
+#include "models/author.hpp"
+#include "models/book.hpp"
+
+using namespace matador;
+using namespace matador::object;
+using namespace matador::test;
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with has many relation", "[session][insert][has_many]") {
+  auto result = schema.attach<book>("books")
+    .and_then( [this] { return schema.attach<author>("authors"); } )
+    .and_then([this] { return schema.create(db); } );
+  REQUIRE(result.is_ok());
+
+  schema.initialize_executor(ses);
+
+  auto s_king = make_object<author>(1, "Steven", "King", "21.9.1947", 1956, false);
+
+  s_king->books.push_back(make_object<book>(2, "Carrie", object_ptr<author>{}, 1974));
+  s_king->books.push_back(make_object<book>(3, "The Shining", object_ptr<author>{}, 1977));
+  s_king->books.push_back(make_object<book>(4, "It", object_ptr<author>{}, 1986));
+  s_king->books.push_back(make_object<book>(5, "Misery", object_ptr<author>{}, 1987));
+  s_king->books.push_back(make_object<book>(6, "The Dark Tower: The Gunslinger", object_ptr<author>{}, 1982));
+
+  auto res = ses.insert(s_king);
+  REQUIRE(res.is_ok());
+}