Travis-Ci Install and run CxxTest - c++

Question

I am trying to add Travis-Ci support for my open source project hosted on Github
Problem appears when CMake tries to find CxxTest. Travis-Ci runs on old Ubuntu version, in which CxxTest is not trusted. I achieved some results. At this state CxxTest installs fine, but CMake is unable to find cxxtestgen.
Question: How do I correctly install and use CxxTest in Travis-Ci ?
Build log on Travis
Travis.yml
language: cpp
compiler:
- gcc
before_install:
- lsb_release -c
- lsb_release -r
- sudo apt-add-repository 'deb http://archive.ubuntu.com/ubuntu vivid main universe multiverse restricted'
- sudo apt-add-repository 'deb http://archive.ubuntu.com/ubuntu trusty main universe multiverse restricted'
- sudo apt-key update
- sudo apt-get -y update
install:
- sudo apt-get --no-install-recommends -y install cxxtest;
- sudo find / -type f -name "cxxtestgen*"
- sudo ln /usr/share/cxxtest/cxxtest/cxxtestgen.py /usr/bin/cxxtestgen.py
- sudo find / -type f -name "cxxtestgen*"
- echo $PATH
before_script:
- cmake .
script: make
CMake log
$ cmake .
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/g++
-- Check for working CXX compiler: /usr/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:91 (MESSAGE):
Could NOT find CxxTest (missing: CXXTEST_PERL_TESTGEN_EXECUTABLE)
Call Stack (most recent call first):
/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:252 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-2.8/Modules/FindCxxTest.cmake:179 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
test/CMakeLists.txt:5 (find_package)
-- Configuring incomplete, errors occurred!
The command "cmake ." failed and exited with 1 during .
Your build has been stopped.

Answer 1

I found answer by myself.
language: cpp
compiler:
- gcc
cache:
apt: true
addons:
apt:
sources:
- ubuntu-toolchain-r-test
- george-edison55/cmake-3.x
packages:
- gcc-6
- g++-6
- libboost-dev
- gcc-multilib
- gcc-6-multilib
- g++-multilib
- g++-6-multilib
- libc6-dev-i386
- libc6-i386
- cxxtest
- cmake
before_install:
- echo `getconf _NPROCESSORS_ONLN`
- lsb_release -c
- lsb_release -r
install:
- if [ "$CXX" = "g++" ]; then export CXX="g++-6" CC="gcc-6"; fi
before_script:
- cmake --version
- cmake .
script:
- make -j$((2 * `getconf _NPROCESSORS_ONLN`))
sudo: false
dist: trusty