Test MySQLi connection via TLS on Travis

.travis.yml

@@ -185,6 +185,9 @@ jobs:
     - stage: Test
       php: 7.4
       env: DB=mysqli.docker IMAGE=mysql:8.0
+    - stage: Test
+      php: 7.4
+      env: DB=mysqli-tls.docker IMAGE=mysql:8.0
     - stage: Test
       php: 7.4
       env: DB=mariadb.docker IMAGE=mariadb:10.3

tests/travis/docker-run-mysql-or-mariadb.sh

@@ -16,6 +16,7 @@ docker run \
     --detach \
     --env MYSQL_ALLOW_EMPTY_PASSWORD=yes \
     --env MYSQL_DATABASE=doctrine_tests \
+    --volume /tmp/mysql:/var/lib/mysql \
     --publish 33306:3306 \
     --name rdbms \
     "$IMAGE" $CMD_OPTIONS

tests/travis/mysqli-tls.docker.travis.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="../../vendor/phpunit/phpunit/phpunit.xsd"
+         colors="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         failOnRisky="true"
+         failOnWarning="true"
+>
+    <php>
+        <var name="db_driver" value="mysqli"/>
+        <var name="db_host" value="127.0.0.1"/>
+        <var name="db_port" value="33306"/>
+        <var name="db_user" value="root"/>
+        <var name="db_dbname" value="doctrine_tests"/>
+        <var name="db_driver_option_ssl_ca" value="/tmp/mysql/ca.pem"/>
+        <var name="db_driver_option_ssl_cert" value="/tmp/mysql/client-cert.pem"/>
+        <var name="db_driver_option_ssl_key" value="/tmp/mysql/client-key.pem"/>
+    </php>
+
+    <testsuites>
+        <testsuite name="Doctrine DBAL Test Suite">
+            <directory>../Doctrine/Tests/DBAL</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory suffix=".php">../../lib/Doctrine</directory>
+        </whitelist>
+    </filter>
+
+    <groups>
+        <exclude>
+            <group>performance</group>
+            <group>locking_functional</group>
+        </exclude>
+    </groups>
+</phpunit>