test: check count erroneous early exit

The test was missing from PR #419, which had solved the original issue.

Follows #418

test/integration/count_test.lua

@@ -3,6 +3,7 @@ local clock = require('clock')
 local t = require('luatest')
 
 local helpers = require('test.helper')
+local read_scenario = require('test.integration.read_scenario')
 
 local pgroup = t.group('count', helpers.backend_matrix({
     {engine = 'memtx'},
@@ -867,3 +868,17 @@ pgroup.test_count_force_map_call = function(g)
     t.assert_equals(err, nil)
     t.assert_equals(result, 2)
 end
+
+pgroup.test_gh_418_count_with_secondary_noneq_index_condition = function(g)
+    local read = function(cg, space, conditions, opts)
+        opts = table.deepcopy(opts) or {}
+        opts.mode = 'write'
+
+        local resp, err = cg.cluster.main_server:call('crud.count', {space, conditions, opts})
+        t.assert_equals(err, nil)
+
+        return resp
+    end
+
+    read_scenario.gh_418_read_with_secondary_noneq_index_condition(g, read)
+end

test/integration/read_scenario.lua

@@ -1,4 +1,4 @@
--- crud.select/crud.pairs/readview:select/readview:pairs
+-- crud.select/crud.pairs/crud.count/readview:select/readview:pairs
 -- have a lot of common scenarios, which are mostly tested with
 -- four nearly identical copypasted test functions now.
 -- This approach is expected to improve it at least for new test cases.
@@ -48,13 +48,17 @@ local function gh_418_read_with_secondary_noneq_index_condition(cg, read)
     -- iterator had erroneously expected tuples to be sorted by `last_login`
     -- index while iterating on `city` index. Before the issue had beed fixed,
     -- user had received only one record instead of two.
-    local objects = read(cg,
+    local result = read(cg,
         'logins',
         {{'=', 'city', 'Tatsumi Port Island'}, {'<=', 'last_login', 42}},
         {bucket_id = PINNED_BUCKET_NO}
     )
 
-    t.assert_equals(objects, {expected_objects[1], expected_objects[3]})
+    if type(result) == 'number' then -- crud.count
+        t.assert_equals(result, 2)
+    else
+        t.assert_equals(result, {expected_objects[1], expected_objects[3]})
+    end
 end
 
 return {