diff --git a/ale_linters/elixir/credo.vim b/ale_linters/elixir/credo.vim
index 15ebefb5..892d47b9 100644
--- a/ale_linters/elixir/credo.vim
+++ b/ale_linters/elixir/credo.vim
@@ -48,11 +48,11 @@ endfunction
 function! ale_linters#elixir#credo#GetConfigFile() abort
     let l:config_file = get(g:, 'ale_elixir_credo_config_file', '')
 
-    if len(l:config_file) == 0
+    if empty(l:config_file)
         return ''
-    else
-        return ' --config-file ' . l:config_file
     endif
+
+    return ' --config-file ' . l:config_file
 endfunction
 
 function! ale_linters#elixir#credo#GetCommand(buffer) abort
diff --git a/test/command_callback/test_elixir_credo.vader b/test/command_callback/test_elixir_credo.vader
index 3eb88846..b14444c6 100644
--- a/test/command_callback/test_elixir_credo.vader
+++ b/test/command_callback/test_elixir_credo.vader
@@ -38,3 +38,10 @@ Execute(Builds credo command with suggest mode when set to 0):
   AssertLinter 'mix',
   \ ale#path#CdString(ale#path#Simplify(g:dir . '/elixir_paths/mix_project'))
   \ . 'mix help credo && mix credo suggest --format=flycheck --read-from-stdin %s'
+
+Execute(Builds credo command with a custom config file):
+  let g:ale_elixir_credo_config_file = '/home/user/custom_credo.exs'
+
+  AssertLinter 'mix',
+  \ ale#path#CdString(ale#path#Simplify(g:dir . '/elixir_paths/mix_project'))
+  \ . 'mix help credo && mix credo suggest --config-file /home/user/custom_credo.exs --format=flycheck --read-from-stdin %s'
diff --git a/test/test_elixir_credo.vader b/test/test_elixir_credo.vader
deleted file mode 100644
index 78d3e0a6..00000000
--- a/test/test_elixir_credo.vader
+++ /dev/null
@@ -1,35 +0,0 @@
-Before:
-  call ale#test#SetDirectory('/testplugin/test')
-
-  runtime ale_linters/elixir/credo.vim
-  let g:test_command_start = ale#path#CdString('.') . 'mix help credo && '
-
-After:
-  call ale#test#RestoreDirectory()
-  call ale#linter#Reset()
-  let g:ale_elixir_credo_strict = 0
-  let g:ale_elixir_credo_config_file = ''
-  let g:test_command_start = ''
-
-Execute(credo runs the right command):
-  call ale#test#SetFilename('elixir-test-files/testfile.ex')
-
-  AssertEqual
-  \ ale_linters#elixir#credo#GetCommand(bufnr('')),
-  \ g:test_command_start . 'mix credo suggest --format=flycheck --read-from-stdin %s'
-
-Execute(credo runs the right command with the strict flag):
-  let g:ale_elixir_credo_strict = 1
-  call ale#test#SetFilename('elixir-test-files/testfile.ex')
-
-  AssertEqual
-  \ ale_linters#elixir#credo#GetCommand(bufnr('')),
-  \ g:test_command_start . 'mix credo --strict --format=flycheck --read-from-stdin %s'
-
-Execute(credo runs the right command with a custom config file):
-  let g:ale_elixir_credo_config_file = '/home/user/custom_credo.exs'
-  call ale#test#SetFilename('elixir-test-files/testfile.ex')
-
-  AssertEqual
-  \ ale_linters#elixir#credo#GetCommand(bufnr('')),
-  \ g:test_command_start . 'mix credo suggest --config-file /home/user/custom_credo.exs --format=flycheck --read-from-stdin %s'