diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 72f7beb..5e1634a 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -79,7 +79,7 @@ code coverage of the fixed bugs and the new features.
 To run the existing unit tests, run this command:
 
 ```bash
-vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml Tests/Unit/
+vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Unit/
 ```
 
 ### Running the integration tests
@@ -100,7 +100,7 @@ When running the integration tests, you will need to specify the database name
 and access credentials on the command line (in the same line):
 
 ```bash
-PHPLIST_DATABASE_NAME=phplist_test PHPLIST_DATABASE_USER=phplist PHPLIST_DATABASE_PASSWORD=batterystaple vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml Tests/Integration/
+PHPLIST_DATABASE_NAME=phplist_test PHPLIST_DATABASE_USER=phplist PHPLIST_DATABASE_PASSWORD=batterystaple vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Integration/
 ```
 
 
@@ -116,7 +116,7 @@ We will only merge pull requests that follow the project's coding style.
 Please check your code with the provided PHP_CodeSniffer standard:
 
 ```bash
-vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ Tests/
+vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/
 ```
 
 Please also check the code structure using PHPMD:
@@ -128,13 +128,13 @@ vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/
 And also please run the static code analysis:
 
 ```bash
-vendor/bin/phpstan analyse -l 5 Classes/ Tests/
+vendor/bin/phpstan analyse -l 5 Classes/ tests/
 ```
 
 You can also run all code style checks using one long line from a bash shell:
 
 ```bash
-find Classes/ Tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l && vendor/bin/phpstan analyse -l 5 Classes/ Tests/ && vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml && vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ Tests/
+find Classes/ tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l && vendor/bin/phpstan analyse -l 5 Classes/ tests/ && vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml && vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/
 ```
 
 This will execute all tests except for the unit tests and the integration
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 3e2493c..13650be 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -12,7 +12,7 @@ Are your changes covered with unit tests, and do they not break anything?
 
 You can run the existing unit tests using this command:
 
-    vendor/bin/phpunit Tests/
+    vendor/bin/phpunit tests/
 
 
 ### Code style
@@ -22,7 +22,7 @@ style?
 
 You can check for this using this command:
 
-    vendor/bin/phpcs --standard=PSR2 Classes/ Tests/
+    vendor/bin/phpcs --standard=PSR2 Classes/ tests/
 
 
 ### Other Information
diff --git a/.travis.yml b/.travis.yml
index 9c31e87..5fbc25a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -61,22 +61,22 @@ script:
 - >
   echo;
   echo "Linting all PHP files";
-  find Classes/ Tests/ -name ''*.php'' -print0 | xargs -0 -n 1 -P 4 php -l;
+  find Classes/ tests/ -name ''*.php'' -print0 | xargs -0 -n 1 -P 4 php -l;
 
 - >
   echo;
   echo "Running the unit tests";
-  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml Tests/Unit/;
+  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Unit/;
 
 - >
   echo;
   echo "Running the integration tests";
-  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml Tests/Integration/;
+  vendor/bin/phpunit -c Configuration/PHPUnit/phpunit.xml tests/Integration/;
 
 - >
   echo;
   echo "Running the static analysis";
-  vendor/bin/phpstan analyse -l 5 Classes/ Tests/;
+  vendor/bin/phpstan analyse -l 5 Classes/ tests/;
 
 - >
   echo;
@@ -86,4 +86,4 @@ script:
 - >
   echo;
   echo "Running PHP_CodeSniffer";
-  vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ Tests/;
+  vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/;
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a046df0..e3cfba8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - REST action for getting all subscribers for a list (#83)
 
 ### Changed
+- Adopt more of the default Symfony project structure (#92)
 
 ### Deprecated
 
diff --git a/composer.json b/composer.json
index 3f16dd3..ebd0970 100644
--- a/composer.json
+++ b/composer.json
@@ -49,7 +49,7 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "PhpList\\RestBundle\\Tests\\": "Tests/"
+            "PhpList\\RestBundle\\Tests\\": "tests/"
         }
     },
     "scripts": {
@@ -84,7 +84,7 @@
         "symfony-bin-dir": "bin",
         "symfony-var-dir": "var",
         "symfony-web-dir": "web",
-        "symfony-tests-dir": "Tests",
+        "symfony-tests-dir": "tests",
         "phplist/phplist4-core": {
             "bundles": [
                 "FOS\\RestBundle\\FOSRestBundle",
diff --git a/Tests/Integration/Composer/ScriptsTest.php b/tests/Integration/Composer/ScriptsTest.php
similarity index 100%
rename from Tests/Integration/Composer/ScriptsTest.php
rename to tests/Integration/Composer/ScriptsTest.php
diff --git a/Tests/Integration/Controller/AbstractControllerTest.php b/tests/Integration/Controller/AbstractControllerTest.php
similarity index 100%
rename from Tests/Integration/Controller/AbstractControllerTest.php
rename to tests/Integration/Controller/AbstractControllerTest.php
diff --git a/Tests/Integration/Controller/Fixtures/Administrator.csv b/tests/Integration/Controller/Fixtures/Administrator.csv
similarity index 100%
rename from Tests/Integration/Controller/Fixtures/Administrator.csv
rename to tests/Integration/Controller/Fixtures/Administrator.csv
diff --git a/Tests/Integration/Controller/Fixtures/AdministratorToken.csv b/tests/Integration/Controller/Fixtures/AdministratorToken.csv
similarity index 100%
rename from Tests/Integration/Controller/Fixtures/AdministratorToken.csv
rename to tests/Integration/Controller/Fixtures/AdministratorToken.csv
diff --git a/Tests/Integration/Controller/Fixtures/Subscriber.csv b/tests/Integration/Controller/Fixtures/Subscriber.csv
similarity index 100%
rename from Tests/Integration/Controller/Fixtures/Subscriber.csv
rename to tests/Integration/Controller/Fixtures/Subscriber.csv
diff --git a/Tests/Integration/Controller/Fixtures/SubscriberList.csv b/tests/Integration/Controller/Fixtures/SubscriberList.csv
similarity index 100%
rename from Tests/Integration/Controller/Fixtures/SubscriberList.csv
rename to tests/Integration/Controller/Fixtures/SubscriberList.csv
diff --git a/Tests/Integration/Controller/Fixtures/Subscription.csv b/tests/Integration/Controller/Fixtures/Subscription.csv
similarity index 100%
rename from Tests/Integration/Controller/Fixtures/Subscription.csv
rename to tests/Integration/Controller/Fixtures/Subscription.csv
diff --git a/Tests/Integration/Controller/ListControllerTest.php b/tests/Integration/Controller/ListControllerTest.php
similarity index 100%
rename from Tests/Integration/Controller/ListControllerTest.php
rename to tests/Integration/Controller/ListControllerTest.php
diff --git a/Tests/Integration/Controller/SessionControllerTest.php b/tests/Integration/Controller/SessionControllerTest.php
similarity index 100%
rename from Tests/Integration/Controller/SessionControllerTest.php
rename to tests/Integration/Controller/SessionControllerTest.php
diff --git a/Tests/Integration/Controller/SubscriberControllerTest.php b/tests/Integration/Controller/SubscriberControllerTest.php
similarity index 100%
rename from Tests/Integration/Controller/SubscriberControllerTest.php
rename to tests/Integration/Controller/SubscriberControllerTest.php
diff --git a/Tests/Integration/Routing/RoutingTest.php b/tests/Integration/Routing/RoutingTest.php
similarity index 100%
rename from Tests/Integration/Routing/RoutingTest.php
rename to tests/Integration/Routing/RoutingTest.php
diff --git a/Tests/System/Controller/SessionControllerTest.php b/tests/System/Controller/SessionControllerTest.php
similarity index 100%
rename from Tests/System/Controller/SessionControllerTest.php
rename to tests/System/Controller/SessionControllerTest.php
diff --git a/Tests/Unit/PhpListRestBundleTest.php b/tests/Unit/PhpListRestBundleTest.php
similarity index 100%
rename from Tests/Unit/PhpListRestBundleTest.php
rename to tests/Unit/PhpListRestBundleTest.php