MDL-66322 travis: Configure a local copy of 'exttests'

.travis.yml

@@ -15,6 +15,7 @@ dist: xenial
 
 services:
     - mysql
+    - docker
 
 php:
     # We only run the highest and lowest supported versions to reduce the load on travis-ci.org.
@@ -61,8 +62,9 @@ cache:
       - $HOME/.npm
 
 before_install:
+    - docker run -d -p 127.0.0.1:8080:80 --name exttests moodlehq/moodle-exttests
     # Avoid IPv6 default binding as service (causes redis not to start).
-    sudo service redis-server start --bind 127.0.0.1
+    - sudo service redis-server start --bind 127.0.0.1
 
 install:
     - >
@@ -169,6 +171,10 @@ before_script:
           -e "/require_once/i \\\$CFG->phpunit_dataroot = '\/home\/travis\/roots\/phpunit';" \
           -e "/require_once/i \\\$CFG->phpunit_prefix = 'p_';" \
           config.php ;
+        # Enable test external resources
+        sed -i \
+          -e "/require_once/i \\define('TEST_EXTERNAL_FILES_HTTP_URL', 'http://127.0.0.1:8080');" \
+          config.php ;
         # Redis cache store tests
         sed -i \
           -e "/require_once/i \\define('TEST_CACHESTORE_REDIS_TESTSERVERS', '127.0.0.1');" \
@@ -248,6 +254,8 @@ script:
       if [ "$TASK" = 'PHPUNIT' ];
       then
         vendor/bin/phpunit --fail-on-risky --disallow-test-output --verbose;
+        EXTTESTS_HITS=$(docker logs exttests 2>&1 | grep -Fv -e 'AH00558' -e '[pid 1]' | wc -l)
+        echo -e "\nTest local resources number of hits: ${EXTTESTS_HITS}.\n"
       fi
 
     - >