How about now?

.scripts/travis_setup.sh

@@ -71,6 +71,8 @@ cd $HOME/drupal/modules
 git clone https://github.com/DiegoPino/claw-jsonld.git
 drush en -y jsonld
 
+drush en -y islandora
+
 drush -y dl bootstrap
 drush -y en bootstrap
 drush -y config-set system.theme default bootstrap

.travis.yml

@@ -27,9 +27,10 @@ install:
 
 script:
   - $ISLANDORA_DIR/.scripts/line_endings.sh .
+  - cd $ISLANDORA_DIR/drupal/modules/islandora
   - php vendor/bin/phpcs --standard=Drupal **/*.module **/*.php --ignore=tests,vendor . 
   - php vendor/bin/phpcpd --names *.module,*.inc,*.test,*.php --exclude=vendor .
-  - php /var/www/html/drupal/core/scripts/run-tests.sh islandora
+  - cd $ISLANDORA_DIR/drupal; php core/scripts/run-tests.sh islandora
 
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