DBTablePropertiesTest.GetPropertiesOfTablesInRange: Fix Flaky

Summary:
Summary
There is a possibility that there is no L0 file after writing the data. Generate an L0 file to make it work.

Test Plan: Run the test many times.

Reviewers: andrewkr, yiwu

Reviewed By: yiwu

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D60825

db/db_table_properties_test.cc

@@ -138,14 +138,14 @@ TEST_F(DBTablePropertiesTest, GetPropertiesOfTablesInRange) {
   Options options;
   options.create_if_missing = true;
   options.write_buffer_size = 4096;
-  options.max_write_buffer_number = 8;
+  options.max_write_buffer_number = 3;
   options.level0_file_num_compaction_trigger = 2;
   options.level0_slowdown_writes_trigger = 2;
   options.level0_stop_writes_trigger = 4;
   options.target_file_size_base = 2048;
   options.max_bytes_for_level_base = 10240;
   options.max_bytes_for_level_multiplier = 4;
-  options.soft_rate_limit = 1.1;
+  options.hard_pending_compaction_bytes_limit = 16 * 1024;
   options.num_levels = 8;
 
   DestroyAndReopen(options);
@@ -155,6 +155,12 @@ TEST_F(DBTablePropertiesTest, GetPropertiesOfTablesInRange) {
     ASSERT_OK(Put(test::RandomKey(&rnd, 5), RandomString(&rnd, 102)));
   }
   Flush();
+  dbfull()->TEST_WaitForCompact();
+  if (NumTableFilesAtLevel(0) == 0) {
+    ASSERT_OK(Put(test::RandomKey(&rnd, 5), RandomString(&rnd, 102)));
+    Flush();
+  }
+
   db_->PauseBackgroundWork();
 
   // Ensure that we have at least L0, L1 and L2