diff --git a/.travis.yml b/.travis.yml
index 9c8f223..15557e2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,18 @@
 language: elixir
+
 sudo: false
+
 elixir:
   - 1.4.4
+
+otp_release:
+  - 19.3
+
 branches:
   only:
     - master
-otp_release: 19.3
+
+env:
+  - MIX_ENV=test
+
+script: mix coveralls.travis
diff --git a/README.md b/README.md
index 6dbd11d..9cdfbc1 100644
--- a/README.md
+++ b/README.md
@@ -218,6 +218,7 @@ Components are obtained from `web` by default.
 [![Build Status](https://travis-ci.org/san650/phoenix_components.svg?branch=master)](https://travis-ci.org/san650/phoenix_components)
 [![codebeat badge](https://codebeat.co/badges/135fa334-d08a-4b0a-8bc5-1ae5ea0c939a)](https://codebeat.co/projects/github-com-san650-phoenix_components-master)
 [![Ebert](https://ebertapp.io/github/san650/phoenix_components.svg)](https://ebertapp.io/github/san650/phoenix_components)
+[![Coverage Status](https://coveralls.io/repos/github/san650/phoenix_components/badge.svg?branch=master)](https://coveralls.io/github/san650/phoenix_components?branch=master)
 
 ## License
 
diff --git a/mix.exs b/mix.exs
index 33ed85c..76dc498 100644
--- a/mix.exs
+++ b/mix.exs
@@ -12,6 +12,8 @@ defmodule PhoenixComponents.Mixfile do
       source_url: "https://github.com/san650/phoenix_components",
       start_permanent: Mix.env == :prod,
       version: "1.0.2",
+      test_coverage: [tool: ExCoveralls],
+      preferred_cli_env: ["coveralls": :test, "coveralls.detail": :test, "coveralls.post": :test, "coveralls.html": :test]
     ]
   end
 
@@ -36,6 +38,7 @@ defmodule PhoenixComponents.Mixfile do
     [
       {:credo, "~> 0.3", only: [:dev, :test]},
       {:ex_doc, ">= 0.0.0", only: :dev},
+      {:excoveralls, "~> 0.7", only: :test},
       {:floki, ">= 0.17.2", only: :test},
       {:phoenix, "~> 1.2.1"},
       {:phoenix_html, "~> 2.6"},
diff --git a/mix.lock b/mix.lock
index 43c9344..b44356e 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,12 +1,22 @@
 %{"bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [], [], "hexpm"},
+  "certifi": {:hex, :certifi, "2.0.0", "a0c0e475107135f76b8c1d5bc7efb33cd3815cb3cf3dea7aefdd174dabead064", [], [], "hexpm"},
   "credo": {:hex, :credo, "0.8.10", "261862bb7363247762e1063713bb85df2bbd84af8d8610d1272cd9c1943bba63", [], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}], "hexpm"},
   "earmark": {:hex, :earmark, "1.2.2", "f718159d6b65068e8daeef709ccddae5f7fdc770707d82e7d126f584cd925b74", [:mix], [], "hexpm"},
   "ex_doc": {:hex, :ex_doc, "0.16.1", "b4b8a23602b4ce0e9a5a960a81260d1f7b29635b9652c67e95b0c2f7ccee5e81", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
+  "excoveralls": {:hex, :excoveralls, "0.7.5", "339e433e5d3bce09400dc8de7b9040741a409c93917849916c136a0f51fdc183", [], [{:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
+  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
   "floki": {:hex, :floki, "0.17.2", "81b3a39d85f5cae39c8da16236ce152f7f8f50faf84b480ba53351d7e96ca6ca", [:mix], [{:mochiweb, "~> 2.15", [hex: :mochiweb, repo: "hexpm", optional: false]}], "hexpm"},
+  "hackney": {:hex, :hackney, "1.10.1", "c38d0ca52ea80254936a32c45bb7eb414e7a96a521b4ce76d00a69753b157f21", [], [{:certifi, "2.0.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
+  "idna": {:hex, :idna, "5.1.0", "d72b4effeb324ad5da3cab1767cb16b17939004e789d8c0ad5b70f3cea20c89a", [], [{:unicode_util_compat, "0.3.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
+  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [], [], "hexpm"},
+  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [], [], "hexpm"},
   "mime": {:hex, :mime, "1.1.0", "01c1d6f4083d8aa5c7b8c246ade95139620ef8effb009edde934e0ec3b28090a", [:mix], [], "hexpm"},
+  "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [], [], "hexpm"},
   "mochiweb": {:hex, :mochiweb, "2.15.0", "e1daac474df07651e5d17cc1e642c4069c7850dc4508d3db7263a0651330aacc", [:rebar3], [], "hexpm"},
   "phoenix": {:hex, :phoenix, "1.2.4", "4172479b5e21806a5e4175b54820c239e0d4effb0b07912e631aa31213a05bae", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 1.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.4 or ~> 1.3.3 or ~> 1.2.4 or ~> 1.1.8 or ~> 1.0.5", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, "~> 1.5 or ~> 2.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "phoenix_html": {:hex, :phoenix_html, "2.9.3", "1b5a2122cbf743aa242f54dced8a4f1cc778b8bd304f4b4c0043a6250c58e258", [:mix], [{:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "1.0.1", "c10ddf6237007c804bf2b8f3c4d5b99009b42eca3a0dfac04ea2d8001186056a", [:mix], [], "hexpm"},
   "plug": {:hex, :plug, "1.3.5", "7503bfcd7091df2a9761ef8cecea666d1f2cc454cbbaf0afa0b6e259203b7031", [:mix], [{:cowboy, "~> 1.0.1 or ~> 1.1", [hex: :cowboy, repo: "hexpm", optional: true]}, {:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}], "hexpm"},
-  "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], [], "hexpm"}}
+  "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], [], "hexpm"},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.1", "28a4d65b7f59893bc2c7de786dec1e1555bd742d336043fe644ae956c3497fbe", [], [], "hexpm"},
+  "unicode_util_compat": {:hex, :unicode_util_compat, "0.3.1", "a1f612a7b512638634a603c8f401892afbf99b8ce93a45041f8aaca99cadb85e", [], [], "hexpm"}}