Sample Travis setup for OCaml projects

.travis-ci.sh

# Edit this for your own project dependencies
OPAM_DEPENDS="ocamlfind ounit re"

case "$OCAML_VERSION,$OPAM_VERSION" in
3.12.1,1.0.0) ppa=avsm/ocaml312+opam10 ;;
3.12.1,1.1.0) ppa=avsm/ocaml312+opam11 ;;
4.00.1,1.0.0) ppa=avsm/ocaml40+opam10 ;;
4.00.1,1.1.0) ppa=avsm/ocaml40+opam11 ;;
4.01.0,1.0.0) ppa=avsm/ocaml41+opam10 ;;
4.01.0,1.1.0) ppa=avsm/ocaml41+opam11 ;;
*) echo Unknown $OCAML_VERSION,$OPAM_VERSION; exit 1 ;;
esac

echo "yes" | sudo add-apt-repository ppa:$ppa
sudo apt-get update -qq
sudo apt-get install -qq ocaml ocaml-native-compilers camlp4-extra opam
export OPAMYES=1
export OPAMVERBOSE=1
echo OCaml version
ocaml -version
echo OPAM versions
opam --version
opam --git-version

opam init 
opam install ${OPAM_DEPENDS}
eval `opam config env`
make
make test

.travis.yml

    language: c
    script: bash -ex .travis-ci.sh
    env:
      - OCAML_VERSION=4.01.0 OPAM_VERSION=1.0.0
      - OCAML_VERSION=4.01.0 OPAM_VERSION=1.1.0
      - OCAML_VERSION=4.00.1 OPAM_VERSION=1.0.0
      - OCAML_VERSION=4.00.1 OPAM_VERSION=1.1.0
      - OCAML_VERSION=3.12.1 OPAM_VERSION=1.0.0
      - OCAML_VERSION=3.12.1 OPAM_VERSION=1.1.0

Great stuff! Looks like iocamljs project adopted this approach