Add phpunit to community project tests

Author: nikic

azure/community_job.yml

@@ -92,4 +92,16 @@ jobs:
         sed -i 's/$exit = true/$exit = false/g' vendor/phpunit/phpunit/src/TextUI/Command.php
         php vendor/bin/phpunit
       displayName: 'Test Amphp'
+    - script: |
+        git clone https://github.com/sebastianbergmann/phpunit.git --branch=master --depth=1
+        cd phpunit
+        export USE_ZEND_ALLOC=0
+        export USE_TRACKED_ALLOC=1
+        export ASAN_OPTIONS=exitcode=139
+        php7.3 /usr/bin/composer install --no-progress
+        php ./phpunit
+        if [ $? -gt 128 ]; then
+          exit 1
+        fi
+      displayName: 'Test PHPUnit'
       condition: or(succeeded(), failed())