test: default_tuple_drop_function

Transferring the taptest to the luatest testing system with renaming the
tests and using the existing spaces in helpers.

Check that the default expiration function will work. After
expiration, there will be no tuples in the space.
All tuples will be deleted.

Updated test's name:

- default drop function test -> test_default_tuple_drop_function

Part of #61

test.lua

@@ -274,14 +274,12 @@ init_box()
 -- TAP TESTS:
 -- 1. kill zombie test
 -- 2. multiple expires test
--- 3. default drop function test
--- 4. restart test
--- 5. complex key test
--- 6. delays and scan callbacks test
--- 7. error callback test
+-- 3. restart test
+-- 4. complex key test
+-- 5. delays and scan callbacks test
+-- 6. error callback test
 -- ========================================================================= --
-
-test:plan(7)
+test:plan(6)
 
 test:test("zombie task kill", function(test)
     test:plan(4)
@@ -379,41 +377,6 @@ test:test("multiple expires test", function(test)
     expirationd.kill("test")
 end)
 
-test:test("default drop function test", function(test)
-    test:plan(2)
-    local tuples_count = 10
-    local space_name = 'drop_test'
-    local space = box.space[space_name]
-    for i = 1, tuples_count do
-        space:insert{i, 'test_data', fiber.time()}
-    end
-    test:is(space:count{}, tuples_count, 'tuples are in space')
-
-    expirationd.start(
-        "test",
-        space_name,
-        check_tuple_expire_by_timestamp,
-        {
-            args = {
-                field_no = 3,
-                archive_space_id = archive_space_id,
-            },
-            tuples_per_iteration = 10,
-            full_scan_time = 1,
-        }
-    )
-
-    local task = expirationd.task("test")
-    local res = wait_cond(
-        function()
-            return space:count{} == 0
-        end,
-        2
-    )
-    test:is(res, true, 'all tuples are expired with default function')
-    expirationd.kill("test")
-end)
-
 test:test("restart test", function(test)
     test:plan(5)
     local tuples_count = 10

test/unit/expiration_process_test.lua

@@ -212,3 +212,33 @@ function g.test_check_tuples_not_expired_by_timestamp(cg)
         t.assert_equals(space_archive:count(), total)
     end)
 end
+
+function g.test_default_tuple_drop_function(cg)
+    local space = cg.space
+    local task_name = cg.task_name
+    local space_archive = cg.space_archive
+
+    local total = 10
+    local time = fiber.time()
+    for i = 1, total do
+        space:insert({i, tostring(i), time})
+    end
+    -- Tuples are in space.
+    t.assert_equals(space:count{}, total)
+
+    cg.task = expirationd.start(task_name, space.id, check_tuple_expire_by_timestamp,
+        {
+            args = {
+                field_no = 3,
+            },
+        })
+    cg.total = total
+    local task = cg.task
+
+    -- All tuples are expired with default function.
+    helpers.retrying({}, function()
+        t.assert_equals(task.expired_tuples_count, total)
+        t.assert_equals(space_archive:count(), 0)
+        t.assert_equals(space:count{}, 0)
+    end)
+end