[PATCH v1] test: errinj* tests need fixes for stress runs

[avtikhon]

Tests failed with the following issues:

[010] --- vinyl/errinj.result Tue Mar 19 17:52:48 2019
[010] +++ vinyl/errinj.reject Tue Mar 19 19:07:58 2019
[010] @@ -81,7 +81,7 @@
[010] -- fails due to scheduler timeout
[010] box.snapshot();
[010] ---
[010] -- error: Error injection 'vinyl dump'
[010] +- ok
[010] ...
[010] fiber.sleep(0.06);
[010] ---
[010]

Decided to remove the current check for box snapshot fail on
scheduler timeout.

[035] --- vinyl/errinj_stat.result	Mon May  6 13:11:27 2019
[035] +++ vinyl/errinj_stat.reject	Mon May  6 17:58:48 2019
[035] @@ -250,7 +250,7 @@
[035]  ...
[035]  box.snapshot()
[035]  ---
[035] -- ok
[035] +- error: Error injection 'vinyl dump'
[035]  ...
[035]  i:compact()
[035]  ---
[035]

Decided to add the wait condition checker of the scheduler
tasks_completed number instead of the fiber delay.

Close #4058
---

Github: https://github.com/tarantool/tarantool/tree/avtikhon/gh-4058-vinyl-errinj-stress
Issue: https://github.com/tarantool/tarantool/issues/4058
 
 test/vinyl/errinj.result        | 5 -----
 test/vinyl/errinj.test.lua      | 2 --
 test/vinyl/errinj_stat.result   | 3 ++-
 test/vinyl/errinj_stat.test.lua | 2 +-
 4 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/test/vinyl/errinj.result b/test/vinyl/errinj.result
index c69347da6..e8795143f 100644
--- a/test/vinyl/errinj.result
+++ b/test/vinyl/errinj.result
@@ -78,11 +78,6 @@ errinj.set("ERRINJ_VY_RUN_WRITE", false);
 ---
 - ok
 ...
--- fails due to scheduler timeout
-box.snapshot();
----
-- error: Error injection 'vinyl dump'
-...
 fiber.sleep(0.06);
 ---
 ...
diff --git a/test/vinyl/errinj.test.lua b/test/vinyl/errinj.test.lua
index c3ce9706f..034ed34ce 100644
--- a/test/vinyl/errinj.test.lua
+++ b/test/vinyl/errinj.test.lua
@@ -38,8 +38,6 @@ num_rows = num_rows + range();
 -- fails due to error injection
 box.snapshot();
 errinj.set("ERRINJ_VY_RUN_WRITE", false);
--- fails due to scheduler timeout
-box.snapshot();
 fiber.sleep(0.06);
 num_rows = num_rows + range();
 box.snapshot();
diff --git a/test/vinyl/errinj_stat.result b/test/vinyl/errinj_stat.result
index f1133137e..a8b5e0312 100644
--- a/test/vinyl/errinj_stat.result
+++ b/test/vinyl/errinj_stat.result
@@ -245,8 +245,9 @@ errinj.set('ERRINJ_VY_SCHED_TIMEOUT', 0)
 ---
 - ok
 ...
-fiber.sleep(0.01)
+test_run:wait_cond(function() return box.stat.vinyl().scheduler.tasks_completed > 1 end)
 ---
+- true
 ...
 box.snapshot()
 ---
diff --git a/test/vinyl/errinj_stat.test.lua b/test/vinyl/errinj_stat.test.lua
index d11da4501..f331d9c2d 100644
--- a/test/vinyl/errinj_stat.test.lua
+++ b/test/vinyl/errinj_stat.test.lua
@@ -74,7 +74,7 @@ stat.tasks_completed == 1
 stat.tasks_failed > 0
 errinj.set('ERRINJ_VY_RUN_WRITE', false)
 errinj.set('ERRINJ_VY_SCHED_TIMEOUT', 0)
-fiber.sleep(0.01)
+test_run:wait_cond(function() return box.stat.vinyl().scheduler.tasks_completed > 1 end)
 box.snapshot()
 i:compact()
 test_run:wait_cond(function() return i:stat().disk.compaction.count > 0 end)
-- 
2.17.1