Fix CI build

.gitignore

@@ -7,3 +7,4 @@ publish/
 Gemfile.lock
 .bundle
 bin/
+.idea

.travis.yml

@@ -3,20 +3,42 @@ rvm:
   - 2.0.0
   - 2.1
   - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
   # optional
   - ruby-head
   - jruby-19mode
   - jruby-head
   - rbx-2
 
+addons:
+  hosts:
+    - ldap.example.org # needed for TLS verification
+
+services:
+  - docker
+
 env:
   - INTEGRATION=openldap
 
 before_install:
   - gem update bundler
 
 install:
-  - if [ "$INTEGRATION" = "openldap" ]; then sudo script/install-openldap; fi
+  - >
+    docker run \
+      --hostname ldap.example.org \
+      --env LDAP_TLS_VERIFY_CLIENT=try \
+      -p 389:389 \
+      -p 636:636 \
+      -v "$(pwd)"/test/fixtures/ldif:/container/service/slapd/assets/config/bootstrap/ldif/custom \
+      --name openldap \
+      --detach \
+      osixia/openldap:1.3.0 \
+        --copy-service \
+        --loglevel debug \
   - bundle install
 
 script: bundle exec rake ci

README.rdoc

@@ -53,9 +53,14 @@ This task will run the test suite and the
   rake rubotest
 
 CI takes too long? If your local box supports
-{Vagrant}[https://www.vagrantup.com/], you can run most of the tests
-in a VM on your local box. For more details and setup instructions, see
-{test/support/vm/openldap/README.md}[https://github.com/ruby-ldap/ruby-net-ldap/tree/master/test/support/vm/openldap/README.md]
+{Docker}[https://www.docker.com/], you can also run integration tests locally.
+Simply run:
+
+  script/ldap-docker
+  INTEGRATION=openldap rake test
+
+CAVEAT: you need to add the following line to /etc/hosts
+    127.0.0.1 ldap.example.org
 
 == Release
 

script/ldap-docker

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Usage: script/ldap-docker
+#
+# Starts a openldap docker container ready for integration tests
+
+docker run --rm -ti \
+  --hostname ldap.example.org \
+  --env LDAP_TLS_VERIFY_CLIENT=try \
+  -p 389:389 -p 636:636 \
+  -v "$(pwd)"/test/fixtures/ldif:/container/service/slapd/assets/config/bootstrap/ldif/custom \
+  --name my-openldap-container \
+  osixia/openldap:1.3.0 --copy-service --loglevel debug