diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index afce633..91c100b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,11 +3,13 @@ image: elixir:1.7.2
 cache:
   key: ${CI_COMMIT_REF_SLUG}
   paths:
-          - deps
-          - _build
+    - deps
+    - _build
+
 stages:
   - lint
   - test
+  - analysis
 
 before_script:
   - mix local.hex --force
@@ -22,5 +24,11 @@ lint:
 
 unit-testing:
   stage: test
+  coverage: '/(\d+\.\d+\%) \| Total/'
   script:
-    - mix test --trace
+    - mix test --trace --cover
+
+analysis:
+  stage: analysis
+  script:
+    - mix credo --strict
diff --git a/lib/auto_linker/parser.ex b/lib/auto_linker/parser.ex
index c37f56c..3395b9c 100644
--- a/lib/auto_linker/parser.ex
+++ b/lib/auto_linker/parser.ex
@@ -39,9 +39,11 @@ defmodule AutoLinker.Parser do
 
   # @user
   # @user@example.com
+  # credo:disable-for-next-line
   @match_mention ~r/^@[a-zA-Z\d_-]+@[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*|@[a-zA-Z\d_-]+/u
 
   # https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
+  # credo:disable-for-next-line
   @match_email ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/u
 
   @match_hashtag ~r/^(?<tag>\#[[:word:]_]*[[:alpha:]_·][[:word:]_·]*)/u
diff --git a/test/auto_linker_test.exs b/test/auto_linker_test.exs
index 9bd0719..6fce60e 100644
--- a/test/auto_linker_test.exs
+++ b/test/auto_linker_test.exs
@@ -24,8 +24,8 @@ defmodule AutoLinkerTest do
 
   test "phone number and markdown link" do
     assert AutoLinker.link("888 888-8888  [ab](a.com)", phone: true, markdown: true) ==
-             "<a href=\"#\" class=\"phone-number\" data-phone=\"8888888888\">888 888-8888</a>" <>
-               "  <a href='a.com' class=\"auto-linker\" target=\"_blank\" rel=\"noopener noreferrer\">ab</a>"
+             ~s(<a href="#" class="phone-number" data-phone="8888888888">888 888-8888</a>) <>
+               ~s(  <a href='a.com' class="auto-linker" target="_blank" rel="noopener noreferrer">ab</a>)
   end
 
   test "all kinds of links" do