diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..03f5bf1
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,9 @@
+# Test coverage configuration.
+# Usage:
+#   pip install coverage
+#   coverage erase  # clears previous data if any
+#   coverage run -m unittest2
+#   coverage html  # creates ./htmlcov/*.html (check index.html)
+[run]
+branch = true
+source = extras_mongoengine
diff --git a/.gitignore b/.gitignore
index 1bbfde7..afa178a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
 *.pyc
 build/
 venv/
+
+# Coverage
+/htmlcov
+/.coverage
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..a8a32fe
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,48 @@
+language: python
+python:
+- '2.6'
+- '2.7'
+- '3.2'
+- '3.3'
+- '3.4'
+- pypy
+- pypy3
+env:
+- PYMONGO=2.7
+- PYMONGO=2.8
+- PYMONGO=3.0
+- PYMONGO=dev
+matrix:
+  fast_finish: true
+before_install:
+# Install MongoDB
+- travis_retry sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
+- echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' |
+  sudo tee /etc/apt/sources.list.d/mongodb.list
+- travis_retry sudo apt-get update
+- travis_retry sudo apt-get install mongodb-org-server
+install:
+# 1. Install Python
+- sudo apt-get install python-dev python3-dev
+# 2. Install general requirements (Python packages)
+- pip install -r requirements.txt
+# 3. Enums in Python only became available in 3.4.
+#    The package `enum34` listed in `requirements-python<3.4.txt` is a backport.
+- if [[ $TRAVIS_PYTHON_VERSION == 2* ]];     then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.2* ]];   then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.3* ]];   then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == pypy* ]]; then pip install -r 'requirements-python<3.4.txt'; fi
+# Coverage 4.0 doesn't support Python 3.2. Install an older version
+# before coveralls tries to install the latest. (pypy3 is really Python 3.2)
+- if [[ $TRAVIS_PYTHON_VERSION == '3.2' ]];   then travis_retry pip install 'coverage<4.0'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 'pypy3' ]]; then travis_retry pip install 'coverage<4.0'; fi
+- travis_retry pip install tox>=1.9 coveralls
+#- travis_retry tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- -e test
+script:
+#- tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
+# Run tests with coverage (similar to `python -m unittest2`
+# or `unit2` on Python 2.6.
+- coverage run -m unittest2
+after_script:
+# Submit coverage to coverall.io
+- coveralls --verbose
diff --git a/extras_mongoengine/__init__.py b/extras_mongoengine/__init__.py
index 6a87ac0..8dc97e9 100644
--- a/extras_mongoengine/__init__.py
+++ b/extras_mongoengine/__init__.py
@@ -1,3 +1,7 @@
-import fields
+try:
+	import fields
+except ImportError:
+	# Python 3
+	from . import fields
 
 __all__ = ('fields')
diff --git a/extras_mongoengine/fields.py b/extras_mongoengine/fields.py
index 5871ddf..e94b61e 100644
--- a/extras_mongoengine/fields.py
+++ b/extras_mongoengine/fields.py
@@ -12,7 +12,7 @@ class TimedeltaField(BaseField):
     """
     def validate(self, value):
         if not isinstance(value, (timedelta, int, float)):
-            self.error(u'cannot parse timedelta "%r"' % value)
+            self.error(unicode('cannot parse timedelta "%r"' % value))
 
     def to_mongo(self, value):
         return self.prepare_query_value(None, value)
diff --git a/requirements-python<3.4.txt b/requirements-python<3.4.txt
new file mode 100644
index 0000000..dc3292c
--- /dev/null
+++ b/requirements-python<3.4.txt
@@ -0,0 +1 @@
+enum34