added test for table sequence

test/backends/TableSequenceTest.cpp

@@ -0,0 +1,40 @@
+#include "catch2/catch_test_macros.hpp"
+
+#include "matador/query/criteria.hpp"
+#include "matador/query/expression/expression_operators.hpp"
+#include "matador/query/query.hpp"
+#include "matador/query/table_column.hpp"
+
+#include "TableSequenceFixture.hpp"
+
+using namespace matador::query;
+using namespace matador::test;
+
+TEST_CASE_METHOD(TableSequenceFixture, "test create and drop table sequence", "[table_sequence][create][drop]") {
+  const auto next_id_col = "next_id"_col;
+  auto result = query::query::insert()
+    .into(sequence_table_name, { "name", next_id_col})
+    .values({ "test_seq", 1 })
+    .execute(db);
+  REQUIRE(result);
+  REQUIRE(result->affected_rows == 1);
+
+  table_column exp(next_id_col - 1);
+  auto id_result = query::query::update(sequence_table_name)
+    .set(next_id_col, next_id_col + 1)
+    .where("name"_col == "test_seq")
+    .returning((next_id_col - 1).as("id"))
+    .fetch_value<int64_t>(db);
+
+  REQUIRE(id_result);
+  REQUIRE(id_result->has_value());
+  REQUIRE(id_result->value() == 1);
+
+  id_result = query::query::select({next_id_col})
+    .from(sequence_table_name)
+    .where("name"_col == "test_seq")
+    .fetch_value<int64_t>(db);
+  REQUIRE(id_result);
+  REQUIRE(id_result->has_value());
+  REQUIRE(id_result->value() == 2);
+}