diff --git a/spec/async_setup_spec.lua b/spec/async_setup_spec.lua
index d7bbc86..a22213f 100644
--- a/spec/async_setup_spec.lua
+++ b/spec/async_setup_spec.lua
@@ -2,11 +2,8 @@ describe('cp.async.setup', function()
   local setup
   local spec_helper = require('spec.spec_helper')
   local mock_async, mock_scraper, mock_state
-  local callback_calls = {}
-
   before_each(function()
     spec_helper.setup()
-    callback_calls = {}
 
     mock_async = {
       start_contest_operation = function() end,
@@ -184,7 +181,7 @@ describe('cp.async.setup', function()
 
     it('starts background test scraping if not cached', function()
       local scraping_started = false
-      mock_scraper.scrape_problem_async = function(platform, contest_id, problem_id, callback)
+      mock_scraper.scrape_problem_async = function(_, _, problem_id, callback)
         scraping_started = true
         callback({ success = true, problem_id = problem_id, test_cases = {} })
       end
@@ -248,7 +245,7 @@ describe('cp.async.setup', function()
       local problems = { { id = 'a' }, { id = 'b' }, { id = 'c' } }
       local scraping_calls = {}
 
-      mock_scraper.scrape_problem_async = function(platform, contest_id, problem_id, callback)
+      mock_scraper.scrape_problem_async = function(_, _, problem_id, callback)
         scraping_calls[#scraping_calls + 1] = problem_id
         callback({ success = true, problem_id = problem_id })
       end
@@ -270,13 +267,13 @@ describe('cp.async.setup', function()
       local problems = { { id = 'a' }, { id = 'b' } }
       local scraping_calls = {}
 
-      mock_scraper.scrape_problem_async = function(platform, contest_id, problem_id, callback)
+      mock_scraper.scrape_problem_async = function(_, _, problem_id, callback)
         scraping_calls[#scraping_calls + 1] = problem_id
         callback({ success = true, problem_id = problem_id })
       end
 
       local mock_cache = require('cp.cache')
-      mock_cache.get_test_cases = function(platform, contest_id, problem_id)
+      mock_cache.get_test_cases = function(_, _, problem_id)
         return problem_id == 'a' and { { input = '1', expected = '1' } } or nil
       end
 
diff --git a/spec/spec_helper.lua b/spec/spec_helper.lua
index ecdbb3e..db826d7 100644
--- a/spec/spec_helper.lua
+++ b/spec/spec_helper.lua
@@ -105,7 +105,7 @@ end
 
 function M.mock_async_scraper_success()
   package.loaded['cp.async.scraper'] = {
-    scrape_contest_metadata_async = function(platform, contest_id, callback)
+    scrape_contest_metadata_async = function(_, _, callback)
       vim.schedule(function()
         callback({
           success = true,
@@ -117,7 +117,7 @@ function M.mock_async_scraper_success()
         })
       end)
     end,
-    scrape_problem_async = function(platform, contest_id, problem_id, callback)
+    scrape_problem_async = function(_, _, problem_id, callback)
       vim.schedule(function()
         callback({
           success = true,
@@ -138,7 +138,7 @@ end
 
 function M.mock_async_scraper_failure()
   package.loaded['cp.async.scraper'] = {
-    scrape_contest_metadata_async = function(platform, contest_id, callback)
+    scrape_contest_metadata_async = function(_, _, callback)
       vim.schedule(function()
         callback({
           success = false,
@@ -146,7 +146,7 @@ function M.mock_async_scraper_failure()
         })
       end)
     end,
-    scrape_problem_async = function(platform, contest_id, problem_id, callback)
+    scrape_problem_async = function(_, _, problem_id, callback)
       vim.schedule(function()
         callback({
           success = false,