Merge pull request #709 from davedevelopment/stretch-composer-versions

Attempt to check lower and upper bounds of deps

.travis.yml

@@ -2,18 +2,36 @@ sudo: false
 
 language: php
 
-php:
-  - 5.6
-  - 7.0
-  - 7.1
-  - hhvm
-
 matrix:
   allow_failures:
     - php: hhvm
     - php: hhvm-nightly
-
   fast_finish: true
+  include:
+    - php: 5.6
+      env:
+        - DEPS=lowest
+    - php: 5.6
+      env:
+        - DEPS=latest
+    - php: 7.0
+      env:
+        - DEPS=lowest
+    - php: 7.0
+      env:
+        - DEPS=latest
+    - php: 7.1
+      env:
+        - DEPS=lowest
+    - php: 7.1
+      env:
+        - DEPS=latest
+    - php: hhvm
+      env:
+        - DEPS=lowest
+    - php: hhvm
+      env:
+        - DEPS=latest
 
 cache:
   directories:
@@ -23,7 +41,8 @@ before_install:
   - alias composer=composer\ -n && composer self-update
 
 install:
-  - composer install
+  - if [[ $DEPS == 'latest' ]]; then travis_retry composer update --no-interaction ; fi
+  - if [[ $DEPS == 'lowest' ]]; then travis_retry composer update --prefer-lowest --prefer-stable --no-interaction ; fi
 
 before_script:
   # Install extensions for PHP 5.x series. 7.x includes them by default.