TraceLog - replace unit test with integration test

tests/integration/test_trace_log_table/configs/trace_log.xml

+<yandex>
+    <trace_log>
+        <database>system</database>
+        <table>trace_log</table>
+        <partition_by>toYYYYMM(event_date)</partition_by>
+        <flush_interval_milliseconds>1000</flush_interval_milliseconds>
+    </trace_log>
+</yandex>

tests/integration/test_trace_log_table/test.py

+# pylint: disable=unused-argument
+# pylint: disable=redefined-outer-name
+import time
+
+import pytest
+from helpers.cluster import ClickHouseCluster
+
+cluster = ClickHouseCluster(__file__)
+
+node = cluster.add_instance('node', with_zookeeper=True, main_configs=["configs/trace_log.xml"])
+
+
+@pytest.fixture(scope='module')
+def start_cluster():
+    try:
+        cluster.start()
+
+        yield cluster
+    finally:
+        cluster.shutdown()
+
+
+# Tests that the event_time_microseconds field in the system.trace_log table gets populated.
+# To make the tests work better, the default flush_interval_milliseconds is being overridden
+# to 1000 ms. Also the query_profiler_real_time_period_ns and the query_profiler_cpu_time_period_ns
+# are set to suitable values so that traces are properly populated. Test compares the event_time and
+# event_time_microseconds fields and asserts that they are exactly equal upto their seconds parts. Also
+# one additional test to ensure that the count(event_time_microseconds) is > 0;
+def test_field_event_time_microseconds(start_cluster):
+    node.query('SET query_profiler_real_time_period_ns = 0;')
+    node.query('SET query_profiler_cpu_time_period_ns = 1000000;')
+    node.query('SET log_queries = 1;')
+    node.query("CREATE DATABASE replica;")
+    query_create = '''CREATE TABLE replica.test
+        (
+           id Int64,
+           event_time DateTime
+        )
+        Engine=MergeTree()
+        PARTITION BY toYYYYMMDD(event_time)
+        ORDER BY id;'''
+    node.query(query_create)
+    node.query('''INSERT INTO replica.test VALUES (1, now())''')
+    node.query("SYSTEM FLUSH LOGS;")
+    # TODO: is sleep necessary ?
+    time.sleep(1)
+    # query assumes that the event_time field is already accurate
+    equals_query = '''WITH (
+                        (
+                            SELECT event_time_microseconds
+                            FROM system.trace_log
+                            ORDER BY event_time DESC
+                            LIMIT 1
+                        ) AS time_with_microseconds, 
+                        (
+                            SELECT event_time
+                            FROM system.trace_log
+                            ORDER BY event_time DESC
+                            LIMIT 1
+                        ) AS t)
+                    SELECT if(dateDiff('second', toDateTime(time_with_microseconds), toDateTime(t)) = 0, 'ok', 'fail') 
+    '''
+    assert 'ok\n' in node.query(equals_query)
+    assert 'ok\n' in node.query(
+        '''SELECT if((SELECT COUNT(event_time_microseconds) FROM system.trace_log) > 0, 'ok', 'fail')''')

tests/queries/0_stateless/01473_event_time_microseconds.reference

 01473_metric_log_table_event_start_time_microseconds_test
 ok
-01473_trace_log_table_event_start_time_microseconds_test
-ok
 01473_query_log_table_event_start_time_microseconds_test
 ok
 01473_query_thread_log_table_event_start_time_microseconds_test

tests/queries/0_stateless/01473_event_time_microseconds.sql

@@ -23,23 +23,6 @@ WITH (
     ) AS time)
 SELECT if(dateDiff('second', toDateTime(time_with_microseconds), toDateTime(time)) = 0, 'ok', 'fail');
 
-SELECT '01473_trace_log_table_event_start_time_microseconds_test';
-SYSTEM FLUSH LOGS;
-WITH (
-    (
-        SELECT event_time_microseconds
-        FROM system.trace_log
-        ORDER BY event_time DESC
-        LIMIT 1
-    ) AS time_with_microseconds,
-    (
-        SELECT event_time
-        FROM system.trace_log
-        ORDER BY event_time DESC
-        LIMIT 1
-    ) AS time)
-SELECT if(dateDiff('second', toDateTime(time_with_microseconds), toDateTime(time)) = 0, 'ok', 'fail'); -- success
-
 SELECT '01473_query_log_table_event_start_time_microseconds_test';
 SYSTEM FLUSH LOGS;
 WITH (