Added tests for closed database behaviour

test/esqlite_test.erl

@@ -10,6 +10,18 @@ open_single_database_test() ->
     {ok, _C1} = esqlite3:open("test.db"),
     ok.
 
+close_test() ->
+    {ok, C} = esqlite3:open(":memory:"),
+    ok = esqlite3:close(C),
+
+    {error, closed} = esqlite3:set_update_hook(self(), C),
+    {error, closed} = esqlite3:changes(C),
+    {error, closed} = esqlite3:get_autocommit(C),
+
+    {error, _} = esqlite3:exec("create table test(one, two, three)", C),
+
+    ok.
+
 open_multiple_same_databases_test() ->
     {ok, _C1} = esqlite3:open("test.db"),
     {ok, _C2} = esqlite3:open("test.db"),