From b4159f2a88150bc31461ca14e284eb220f3647cd Mon Sep 17 00:00:00 2001
From: kazk <kazk.dev@gmail.com>
Date: Sat, 6 May 2017 17:48:59 -0700
Subject: [PATCH] Improve Travis build time

---
 .travis.yml | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 0c971e83..58fc0f46 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,9 @@ language: node_js
 node_js:
   - "6"
 
+before_install:
+  - sudo apt-get update && sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-engine
+  - docker --version
 install:
   - npm install -g eslint
 
@@ -36,4 +39,9 @@ env:
 
 script:
   - eslint '**/*.js'
-  - make $TEST_IMG
+  - cp docker/${TEST_IMG}.docker ./Dockerfile
+  - if docker pull codewars/${TEST_IMG}-runner; then
+      docker build --cache-from codewars/${TEST_IMG}-runner -t codewars/${TEST_IMG}-runner .;
+    else
+      docker build -t codewars/${TEST_IMG}-runner .;
+    fi