Add test for reading not being supported

Author: Mytherin

test/sql/misc/postgres_binary.test

@@ -61,3 +61,12 @@ statement error
 COPY (SELECT 42::UINT32) TO '__TEST_DIR__/pg_binary.bin' (FORMAT postgres_binary);
 ----
 not supported
+
+# reading not yet supported
+statement ok
+CREATE TABLE read_tbl(i int);
+
+statement error
+COPY read_tbl FROM '__TEST_DIR__/pg_binary.bin' (FORMAT postgres_binary);
+----
+not supported