snapfs_get_snapshot_timestamp test fixed

Author: rzharkov

src/test/isolation/expected/snapfs_get_snapshot_timestamp.out

@@ -0,0 +1,17 @@
+Parsed test spec with 1 sessions
+
+starting permutation: s1_mk_sn
+step s1_mk_sn: 
+	select 1 as "make_snapshot" from pg_make_snapshot();
+	create table foo as select 'test_data';
+	select ( now() - ( select pg_get_snapshot_timestamp( ( select recent_snapshot from pg_control_snapshot() ) ) ) ) between '0 sec'::interval and '1 min'::interval as "timestamp_check"
+
+make_snapshot  
+
+1              
+timestamp_check
+
+t              
+pg_remove_snapshot
+
+               

src/test/isolation/snap_schedule

@@ -2,5 +2,6 @@ test: snapfs_switch_to_snapshot_three_backends
 test: snapfs_switch_to_snapshot_sequence
 test: snapfs_revert_to_snapshot_sequence
 test: snapfs_set_backend_snapshot_sequence
+test: snapfs_get_snapshot_timestamp
 test: snapfs_switch_to_snapshot_temp_table
 test: snapfs_switch_to_snapshot_temp_table_2

src/test/isolation/specs/snapfs_get_snapshot_timeout.spec renamed to src/test/isolation/specs/snapfs_get_snapshot_timestamp.spec

@@ -7,6 +7,7 @@ teardown {
 session "s1"
 step "s1_mk_sn" {
 	select 1 as "make_snapshot" from pg_make_snapshot();
+	create table foo as select 'test_data';
 	select ( now() - ( select pg_get_snapshot_timestamp( ( select recent_snapshot from pg_control_snapshot() ) ) ) ) between '0 sec'::interval and '1 min'::interval as "timestamp_check"
 }
 step "s1_rc_sn_1" {