Test scaffold

.travis.yml

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+language: php
+
+services:
+  - mysql
+  - postgresql
+
+env:
+  global:
+    - COMPOSER_ROOT_VERSION=2.x-dev
+
+matrix:
+  include:
+    - php: '7.1'
+      env: DB=MYSQL RECIPE_VERSION=4.4.x-dev PHPUNIT_TEST=1 PHPCS_TEST=1
+    - php: '7.1'
+      env: DB=PGSQL RECIPE_VERSION=4.4.x-dev PHPUNIT_COVERAGE_TEST=1
+    - php: '7.2'
+      env: DB=MYSQL RECIPE_VERSION=4.4.x-dev PHPUNIT_TEST=1
+    - php: '7.3'
+      env: DB=MYSQL RECIPE_VERSION=4.x-dev PHPUNIT_TEST=1
+
+before_script:
+  # Init PHP
+  - phpenv rehash
+  - phpenv config-rm xdebug.ini
+  - echo 'memory_limit = 2048M' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+
+  # Install composer dependencies
+  - composer validate
+  - if [[ $DB == PGSQL ]]; then composer require silverstripe/postgresql:2.1.x-dev --no-update; fi
+  - composer require --no-update silverstripe/recipe-cms:"$RECIPE_VERSION" silverstripe/recipe-testing:^1
+  - composer install --prefer-dist --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile
+
+script:
+  - if [[ $PHPUNIT_TEST ]]; then vendor/bin/phpunit; fi
+  - if [[ $PHPUNIT_COVERAGE_TEST ]]; then phpdbg -qrr vendor/bin/phpunit --coverage-clover=coverage.xml; fi
+  - if [[ $PHPCS_TEST ]]; then vendor/bin/phpcs src/ tests/ *.php; fi
+
+after_success:
+  - if [[ $PHPUNIT_COVERAGE_TEST ]]; then bash <(curl -s https://codecov.io/bash) -f coverage.xml; fi

phpunit.xml.dist

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+<phpunit bootstrap="vendor/silverstripe/cms/tests/bootstrap.php" colors="true">
+    <testsuite name="Default">
+        <directory>tests/</directory>
+    </testsuite>
+    <filter>
+        <whitelist addUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src/</directory>
+            <exclude>
+                <directory suffix=".php">tests/</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>