should be it

external/duckdb/tools/juliapkg/test/test_transaction.jl

@@ -0,0 +1,23 @@
+# test_transaction.jl
+
+@testset "Test DBInterface.transaction" begin
+    con = DBInterface.connect(DuckDB.DB, ":memory:")
+
+    # throw an exception in DBInterface.transaction
+    # this should cause a rollback to happen
+    @test_throws DuckDB.QueryException DBInterface.transaction(con) do
+        DBInterface.execute(con, "CREATE TABLE integers(i INTEGER)")
+        return DBInterface.execute(con, "SELEC")
+    end
+
+    # verify that the table does not exist
+    @test_throws DuckDB.QueryException DBInterface.execute(con, "SELECT * FROM integers")
+
+    # no exception, this should work and be committed
+    DBInterface.transaction(con) do
+        return DBInterface.execute(con, "CREATE TABLE integers(i INTEGER)")
+    end
+    DBInterface.execute(con, "SELECT * FROM integers")
+
+    DBInterface.close!(con)
+end