diff --git a/lua/cp/test_render.lua b/lua/cp/test_render.lua
index aa7acf1..df3d9b3 100644
--- a/lua/cp/test_render.lua
+++ b/lua/cp/test_render.lua
@@ -7,7 +7,7 @@ local M = {}
 ---Convert test status to CP terminology with colors
 ---@param test_case TestCase
 ---@return StatusInfo
-local function get_status_info(test_case)
+function M.get_status_info(test_case)
   if test_case.status == 'pass' then
     return { text = 'AC', highlight_group = 'CpTestAC' }
   elseif test_case.status == 'fail' then
@@ -36,7 +36,7 @@ function M.render_test_list(test_state)
   for i, test_case in ipairs(test_state.test_cases) do
     local is_current = i == test_state.current_index
     local prefix = is_current and '> ' or '  '
-    local status_info = get_status_info(test_case)
+    local status_info = M.get_status_info(test_case)
 
     local status_text = status_info.text ~= '' and status_info.text or ''
     local line = string.format('%s%d. %s', prefix, i, status_text)
diff --git a/spec/diff_spec.lua b/spec/diff_spec.lua
index 6fef325..95097ee 100644
--- a/spec/diff_spec.lua
+++ b/spec/diff_spec.lua
@@ -4,7 +4,8 @@ describe('cp.diff', function()
   describe('get_available_backends', function()
     it('returns vim and git backends', function()
       local backends = diff.get_available_backends()
-      assert.same({ 'vim', 'git' }, backends)
+      table.sort(backends)
+      assert.same({ 'git', 'vim' }, backends)
     end)
   end)
 
@@ -30,7 +31,11 @@ describe('cp.diff', function()
   describe('is_git_available', function()
     it('returns true when git command succeeds', function()
       local mock_system = stub(vim, 'system')
-      mock_system.returns({ code = 0 })
+      mock_system.returns({
+        wait = function()
+          return { code = 0 }
+        end,
+      })
 
       local result = diff.is_git_available()
       assert.is_true(result)
@@ -40,7 +45,11 @@ describe('cp.diff', function()
 
     it('returns false when git command fails', function()
       local mock_system = stub(vim, 'system')
-      mock_system.returns({ code = 1 })
+      mock_system.returns({
+        wait = function()
+          return { code = 1 }
+        end,
+      })
 
       local result = diff.is_git_available()
       assert.is_false(result)