diff --git a/.gitignore b/.gitignore
index 1c0b6bb..0fdf3cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,5 @@ build/
 /classpath/
 /.gradle
 /pkg/
+es-data
+out
diff --git a/.travis.yml b/.travis.yml
index 6a5a39d..7d631bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,21 +3,12 @@ language: java
 jdk:
   - oraclejdk8
 
-env:
-  global:
-    - ES_HOST=localhost
-    - ES_PORT=9200
-    - ES_INDEX=embulk
-    - ES_INDEX_TYPE=embulk
-
-before_install:
-  - wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/tar/elasticsearch/2.3.3/elasticsearch-2.3.3.tar.gz
-  - tar zxvf elasticsearch-2.3.3.tar.gz
-  - ./elasticsearch-2.3.3/bin/elasticsearch &
+services:
+  - docker
 
 before_script:
-  - echo "Wait Elasticsearch wakeup"
-  - sleep 10
+  - docker-compose up -d
+  - docker-compose ps
 
 script:
   - ./gradlew gem
diff --git a/README.md b/README.md
index 0250c43..2ae0c55 100644
--- a/README.md
+++ b/README.md
@@ -95,48 +95,18 @@ $ ./gradlew bintrayUpload # release embulk-output-elasticsearch to Bintray maven
 
 ## Test
 
-```
-$ ./gradlew test  # -t to watch change of files and rebuild continuously
-```
-
-To run unit tests, we need to configure the following environment variables.
+Firstly install Docker and Docker compose then `docker-compose up -d`,
+so that an MongoDB server will be locally launched then you can run tests with `./gradlew test`.
 
-When environment variables are not set, skip almost test cases.
+```sh
+$ docker-compose up -d
+Creating network "embulk-output-elasticsearch_default" with the default driver
+Creating embulk-output-elasticsearch_server ... done
 
-```
-ES_HOST
-ES_PORT(optional, if needed, default: 9300)
-ES_INDEX
-ES_INDEX_TYPE
-```
+$ docker-compose ps
+               Name                             Command               State                        Ports
+------------------------------------------------------------------------------------------------------------------------------
+embulk-output-elasticsearch_server   /docker-entrypoint.sh elas ...   Up      0.0.0.0:19200->9200/tcp, 0.0.0.0:19300->9300/tcp
 
-If you're using Mac OS X El Capitan and GUI Applications(IDE), like as follows.
-```
-$ vi ~/Library/LaunchAgents/environment.plist
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-  <key>Label</key>
-  <string>my.startup</string>
-  <key>ProgramArguments</key>
-  <array>
-    <string>sh</string>
-    <string>-c</string>
-    <string>
-      launchctl setenv ES_HOST example.com
-      launchctl setenv ES_PORT 9300
-      launchctl setenv ES_INDEX embulk
-      launchctl setenv ES_INDEX_TYPE embulk
-    </string>
-  </array>
-  <key>RunAtLoad</key>
-  <true/>
-</dict>
-</plist>
-
-$ launchctl load ~/Library/LaunchAgents/environment.plist
-$ launchctl getenv ES_INDEX //try to get value.
-
-Then start your applications.
+$ ./gradlew test  # -t to watch change of files and rebuild continuously
 ```
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..1d094e6
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,10 @@
+version: '3.1'
+services:
+  elasticsearch:
+    container_name: embulk-output-elasticsearch_server
+    image: elasticsearch:5
+    ports:
+    - 19200:9200
+    - 19300:9300
+    volumes:
+    - ./es-data:/usr/share/elasticsearch/data/
diff --git a/src/test/java/org/embulk/output/elasticsearch/ElasticsearchTestUtils.java b/src/test/java/org/embulk/output/elasticsearch/ElasticsearchTestUtils.java
index 747dbad..06c4dfb 100644
--- a/src/test/java/org/embulk/output/elasticsearch/ElasticsearchTestUtils.java
+++ b/src/test/java/org/embulk/output/elasticsearch/ElasticsearchTestUtils.java
@@ -30,27 +30,19 @@ public class ElasticsearchTestUtils
     public static String ES_INDEX2;
     public static String ES_ALIAS;
 
-    /*
-     * This test case requires environment variables
-     *   ES_HOST
-     *   ES_INDEX
-     *   ES_INDEX_TYPE
-     */
     public void initializeConstant()
     {
-        ES_HOST = System.getenv("ES_HOST") != null ? System.getenv("ES_HOST") : "";
-        ES_PORT = System.getenv("ES_PORT") != null ? Integer.valueOf(System.getenv("ES_PORT")) : 9200;
+        ES_HOST = "localhost";
+        ES_PORT = 19200;
 
-        ES_INDEX = System.getenv("ES_INDEX");
+        ES_INDEX = "embulk";
         ES_INDEX2 = ES_INDEX + "_02";
         ES_ALIAS = ES_INDEX + "_alias";
-        ES_INDEX_TYPE = System.getenv("ES_INDEX_TYPE");
+        ES_INDEX_TYPE = "embulk";
         ES_ID = "id";
-        ES_BULK_ACTIONS = System.getenv("ES_BULK_ACTIONS") != null ? Integer.valueOf(System.getenv("ES_BULK_ACTIONS")) : 1000;
-        ES_BULK_SIZE = System.getenv("ES_BULK_SIZE") != null ? Integer.valueOf(System.getenv("ES_BULK_SIZE")) : 5242880;
-        ES_CONCURRENT_REQUESTS = System.getenv("ES_CONCURRENT_REQUESTS") != null ? Integer.valueOf(System.getenv("ES_CONCURRENT_REQUESTS")) : 5;
-
-        assumeNotNull(ES_HOST, ES_INDEX, ES_INDEX_TYPE);
+        ES_BULK_ACTIONS = 1000;
+        ES_BULK_SIZE = 5242880;
+        ES_CONCURRENT_REQUESTS = 5;
 
         ES_NODES = Arrays.asList(ImmutableMap.of("host", ES_HOST, "port", ES_PORT));