minor symfony#15457 [travis] Build phpunit with local components (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
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[travis] Build phpunit with local components

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#14086
| License       | MIT
| Doc PR        | -

The tests for PHP7 currently fail because travis ships with a phar phpunit that embeds the yaml components. This one takes priority over the one in the repo. But it is outdated.
The issue arose with PHP7 tests but could have happen with any build.

Commits
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ce2a371 [travis] Build phpunit with local components

Author: fabpot

.travis.yml

@@ -42,12 +42,16 @@ before_install:
     - if [ "$TRAVIS_BRANCH" = "master" ]; then export COMPOSER_ROOT_VERSION=dev-master; else export COMPOSER_ROOT_VERSION="$TRAVIS_BRANCH".x-dev; fi;
 
 install:
-    - if [ "$deps" = "no" ]; then composer --prefer-source install; fi;
+    - composer --prefer-source install
+    - composer require --no-update phpunit/phpunit '*'
+    - composer require --no-update phpunit/phpunit-mock-objects '2.3.0' # See https://github.com/sebastianbergmann/phpunit-mock-objects/issues/223
+    - composer update --prefer-stable --prefer-source phpunit/phpunit
     - components=$(find src/Symfony -mindepth 3 -type f -name phpunit.xml.dist -printf '%h\n')
     - if [ "$deps" != "no" ]; then php .travis.php $TRAVIS_COMMIT_RANGE $TRAVIS_BRANCH $components; fi;
+    - PHPUNIT="$(readlink -f ./vendor/bin/phpunit) --colors=always"
 
 script:
-    - if [ "$deps" = "no" ]; then echo "$components" | parallel --gnu --keep-order 'echo -e "\\nRunning {} tests"; phpunit --exclude-group tty,benchmark,intl-data {} || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;
-    - if [ "$deps" = "no" ]; then echo -e "\\nRunning tests requiring tty"; phpunit --group tty || (echo -e "\\e[41mKO\\e[0m tty group" && $(exit 1)); fi;
-    - if [ "$deps" = "high" ]; then echo "$components" | parallel --gnu --keep-order -j10% 'echo -e "\\nRunning {} tests"; cd {}; composer --prefer-source update; phpunit --exclude-group tty,benchmark,intl-data || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;
-    - if [ "$deps" = "low" ]; then echo "$components" | parallel --gnu --keep-order -j10% 'echo -e "\\nRunning {} tests"; cd {}; composer --prefer-source --prefer-lowest --prefer-stable update; phpunit --exclude-group tty,benchmark,intl-data || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;
+    - if [ "$deps" = "no" ]; then echo "$components" | parallel --gnu --keep-order 'echo -e "\\nRunning {} tests"; '$PHPUNIT' --exclude-group tty,benchmark,intl-data {} || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;
+    - if [ "$deps" = "no" ]; then echo -e "\\nRunning tests requiring tty"; $PHPUNIT --group tty || (echo -e "\\e[41mKO\\e[0m tty group" && $(exit 1)); fi;
+    - if [ "$deps" = "high" ]; then echo "$components" | parallel --gnu --keep-order -j10% 'echo -e "\\nRunning {} tests"; cd {}; composer --prefer-source update; '$PHPUNIT' --exclude-group tty,benchmark,intl-data || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;
+    - if [ "$deps" = "low" ]; then echo "$components" | parallel --gnu --keep-order -j10% 'echo -e "\\nRunning {} tests"; cd {}; composer --prefer-source --prefer-lowest --prefer-stable update; '$PHPUNIT' --exclude-group tty,benchmark,intl-data || (echo -e "\\e[41mKO\\e[0m {}" && $(exit 1));'; fi;