diff --git a/.github/workflows/flarum-suspend-backend.yml b/.github/workflows/flarum-suspend-backend.yml
index 193d35ea6..b65d7fb07 100644
--- a/.github/workflows/flarum-suspend-backend.yml
+++ b/.github/workflows/flarum-suspend-backend.yml
@@ -6,6 +6,6 @@ jobs:
   run:
     uses: ./.github/workflows/REUSABLE_backend.yml
     with:
-      enable_backend_testing: false
+      enable_backend_testing: true
 
       backend_directory: ./extensions/suspend
diff --git a/extensions/suspend/composer.json b/extensions/suspend/composer.json
index dba03bbbd..f0c381263 100644
--- a/extensions/suspend/composer.json
+++ b/extensions/suspend/composer.json
@@ -51,7 +51,7 @@
                 "prettier": true,
                 "typescript": false,
                 "bundlewatch": false,
-                "backendTesting": false,
+                "backendTesting": true,
                 "editorConfig": true,
                 "styleci": true
             }
@@ -64,5 +64,28 @@
         }
     ],
     "minimum-stability": "dev",
-    "prefer-stable": true
+    "prefer-stable": true,
+    "autoload-dev": {
+        "psr-4": {
+            "Flarum\\Suspend\\Tests\\": "tests/"
+        }
+    },
+    "scripts": {
+        "test": [
+            "@test:unit",
+            "@test:integration"
+        ],
+        "test:unit": "phpunit -c tests/phpunit.unit.xml",
+        "test:integration": "phpunit -c tests/phpunit.integration.xml",
+        "test:setup": "@php tests/integration/setup.php"
+    },
+    "scripts-descriptions": {
+        "test": "Runs all tests.",
+        "test:unit": "Runs all unit tests.",
+        "test:integration": "Runs all integration tests.",
+        "test:setup": "Sets up a database for use with integration tests. Execute this only once."
+    },
+    "require-dev": {
+        "flarum/testing": "^1.0.0"
+    }
 }
diff --git a/extensions/suspend/tests/fixtures/.gitkeep b/extensions/suspend/tests/fixtures/.gitkeep
new file mode 100644
index 000000000..e69de29bb
diff --git a/extensions/suspend/tests/integration/api/UseForumTest.php b/extensions/suspend/tests/integration/api/UseForumTest.php
new file mode 100644
index 000000000..2ef69c5cc
--- /dev/null
+++ b/extensions/suspend/tests/integration/api/UseForumTest.php
@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Suspend\Tests\integration\api;
+
+use Carbon\Carbon;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+
+class UseForumTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-suspend');
+
+        $this->prepareDatabase([
+            'users' => [
+                ['id' => 1, 'username' => 'Muralf', 'email' => 'muralf@machine.local', 'is_email_confirmed' => 1],
+                ['id' => 2, 'username' => 'SuspendedDonny', 'email' => 'acme@machine.local', 'is_email_confirmed' => 1, 'suspended_until' => Carbon::now()->addDay(), 'suspend_reason' => 'acme', 'suspend_message' => 'acme'],
+            ],
+            'discussions' => [
+                ['id' => 1, 'title' => __CLASS__, 'created_at' => Carbon::now(), 'last_posted_at' => Carbon::now(), 'user_id' => 1, 'first_post_id' => 1, 'comment_count' => 1],
+            ],
+            'posts' => [
+                ['id' => 1, 'number' => 1, 'created_at' => Carbon::now(), 'user_id' => 1, 'discussion_id' => 1, 'content' => '<t><p>Hello, world!</p></t>'],
+            ]
+        ]);
+    }
+
+    /** @test */
+    public function suspended_user_cannot_create_discussions()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/discussions', [
+                'authenticatedAs' => 2,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'title' => 'Test post',
+                            'content' => '<t><p>Hello, world!</p></t>'
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+
+    /** @test */
+    public function suspended_user_cannot_reply_to_discussions()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/posts', [
+                'authenticatedAs' => 2,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'content' => '<t><p>Hello, world!</p></t>'
+                        ],
+                        'relationships' => [
+                            'discussion' => [
+                                'data' => [
+                                    'type' => 'discussions',
+                                    'id' => 1,
+                                ],
+                            ],
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+}
diff --git a/extensions/suspend/tests/integration/api/users/ListUsersTest.php b/extensions/suspend/tests/integration/api/users/ListUsersTest.php
new file mode 100644
index 000000000..f3a41d314
--- /dev/null
+++ b/extensions/suspend/tests/integration/api/users/ListUsersTest.php
@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Suspend\Tests\integration\api\users;
+
+use Carbon\Carbon;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+use Illuminate\Support\Arr;
+
+class ListUsersTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-suspend');
+
+        $this->prepareDatabase([
+            'users' => [
+                ['id' => 1, 'username' => 'Muralf', 'email' => 'muralf@machine.local', 'is_email_confirmed' => 1],
+                ['id' => 2, 'username' => 'SuspendedDonny1', 'email' => 'acme1@machine.local', 'is_email_confirmed' => 1, 'suspended_until' => Carbon::now()->addDay(), 'suspend_reason' => 'acme', 'suspend_message' => 'acme'],
+                ['id' => 3, 'username' => 'SuspendedDonny2', 'email' => 'acme2@machine.local', 'is_email_confirmed' => 1, 'suspended_until' => Carbon::now()->addDay(), 'suspend_reason' => 'acme', 'suspend_message' => 'acme'],
+                ['id' => 4, 'username' => 'SuspendedDonny3', 'email' => 'acme3@machine.local', 'is_email_confirmed' => 1, 'suspended_until' => Carbon::now()->subDay(), 'suspend_reason' => 'acme', 'suspend_message' => 'acme'],
+                ['id' => 5, 'username' => 'SuspendedDonny4', 'email' => 'acme4@machine.local', 'is_email_confirmed' => 1, 'suspended_until' => Carbon::now()->addDay(), 'suspend_reason' => 'acme', 'suspend_message' => 'acme'],
+                ['id' => 6, 'username' => 'Acme', 'email' => 'acme5@machine.local', 'is_email_confirmed' => 1],
+            ]
+        ]);
+    }
+
+    public function can_view_default_users_list()
+    {
+        $response = $this->send(
+            $this->request('GET', '/api/users', [
+                'authenticatedAs' => 1,
+            ])->withQueryParams([
+                'filter' => [
+                    'suspended' => true,
+                ],
+            ])
+        );
+
+        $body = json_decode($response->getBody()->getContents(), true);
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertEqualsCanonicalizing([1, 2, 3, 4, 5, 6], Arr::pluck($body['data'], 'id'));
+    }
+
+    /** @test */
+    public function can_filter_users_by_suspension()
+    {
+        $response = $this->send(
+            $this->request('GET', '/api/users', [
+                'authenticatedAs' => 1,
+            ])->withQueryParams([
+                'filter' => [
+                    'suspended' => true,
+                ],
+            ])
+        );
+
+        $body = json_decode($response->getBody()->getContents(), true);
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertEqualsCanonicalizing([2, 3, 5], Arr::pluck($body['data'], 'id'));
+    }
+}
diff --git a/extensions/suspend/tests/integration/api/users/SuspendUserTest.php b/extensions/suspend/tests/integration/api/users/SuspendUserTest.php
new file mode 100644
index 000000000..86fd8f16d
--- /dev/null
+++ b/extensions/suspend/tests/integration/api/users/SuspendUserTest.php
@@ -0,0 +1,104 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Suspend\Tests\integration\api\users;
+
+use Carbon\Carbon;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+use Psr\Http\Message\ResponseInterface;
+
+class SuspendUserTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-suspend');
+
+        $this->prepareDatabase([
+            'users' => [
+                ['id' => 1, 'username' => 'Muralf', 'email' => 'muralf@machine.local', 'is_email_confirmed' => 1],
+                $this->normalUser(),
+                ['id' => 3, 'username' => 'acme', 'email' => 'acme@machine.local', 'is_email_confirmed' => 1],
+            ],
+            'groups' => [
+                ['id' => 5, 'name_singular' => 'Acme', 'name_plural' => 'Acme', 'is_hidden' => 0]
+            ],
+            'group_user' => [
+                ['user_id' => 3, 'group_id' => 5]
+            ],
+            'group_permission' => [
+                ['permission' => 'user.suspend', 'group_id' => 5]
+            ]
+        ]);
+    }
+
+    /**
+     * @dataProvider allowedToSuspendUser
+     * @test
+     */
+    public function can_suspend_user_if_allowed(?int $authenticatedAs, int $targetUserId, string $message)
+    {
+        $response = $this->sendSuspensionRequest($authenticatedAs, $targetUserId);
+
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    /**
+     * @dataProvider unallowedToSuspendUser
+     * @test
+     */
+    public function cannot_suspend_user_if_not_allowed(?int $authenticatedAs, int $targetUserId, string $message)
+    {
+        $response = $this->sendSuspensionRequest($authenticatedAs, $targetUserId);
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+
+    public function allowedToSuspendUser(): array
+    {
+        return [
+            [1, 2, 'Admin can suspend any user'],
+            [1, 3, 'Admin can suspend any user'],
+            [3, 2, 'User with permission can suspend any user'],
+        ];
+    }
+
+    public function unallowedToSuspendUser(): array
+    {
+        return [
+            [1, 1, 'Admin cannot suspend self'],
+            [2, 2, 'User without permission cannot suspend self'],
+            [2, 3, 'User without permission cannot suspend other user'],
+            [3, 3, 'User with permission cannot suspend self'],
+            [3, 1, 'User with permission cannot suspend admin'],
+        ];
+    }
+
+    protected function sendSuspensionRequest(?int $authenticatedAs, int $targetUserId): ResponseInterface
+    {
+        return $this->send(
+            $this->request('PATCH', "/api/users/$targetUserId", [
+                'authenticatedAs' => $authenticatedAs,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'suspendedUntil' => Carbon::now()->addDay(),
+                            'suspendReason' => 'Suspended for acme reasons.',
+                            'suspendMessage' => 'You have been suspended.',
+                        ]
+                    ]
+                ]
+            ])
+        );
+    }
+}
diff --git a/extensions/suspend/tests/integration/setup.php b/extensions/suspend/tests/integration/setup.php
new file mode 100644
index 000000000..67039c083
--- /dev/null
+++ b/extensions/suspend/tests/integration/setup.php
@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Flarum\Testing\integration\Setup\SetupScript;
+
+require __DIR__.'/../../vendor/autoload.php';
+
+$setup = new SetupScript();
+
+$setup->run();
diff --git a/extensions/suspend/tests/phpunit.integration.xml b/extensions/suspend/tests/phpunit.integration.xml
new file mode 100644
index 000000000..90fbbff37
--- /dev/null
+++ b/extensions/suspend/tests/phpunit.integration.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+    backupGlobals="false"
+    backupStaticAttributes="false"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    processIsolation="true"
+    stopOnFailure="false"
+>
+    <coverage processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">../src/</directory>
+        </include>
+    </coverage>
+    <testsuites>
+        <testsuite name="Flarum Integration Tests">
+            <directory suffix="Test.php">./integration</directory>
+             <exclude>./integration/tmp</exclude>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/extensions/suspend/tests/phpunit.unit.xml b/extensions/suspend/tests/phpunit.unit.xml
new file mode 100644
index 000000000..d3a4a3e3d
--- /dev/null
+++ b/extensions/suspend/tests/phpunit.unit.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+    backupGlobals="false"
+    backupStaticAttributes="false"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    processIsolation="false"
+    stopOnFailure="false"
+>
+    <coverage processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">../src/</directory>
+        </include>
+    </coverage>
+    <testsuites>
+        <testsuite name="Flarum Unit Tests">
+            <directory suffix="Test.php">./unit</directory>
+        </testsuite>
+    </testsuites>
+    <listeners>
+        <listener class="\Mockery\Adapter\Phpunit\TestListener" />
+    </listeners>
+</phpunit>
diff --git a/extensions/suspend/tests/unit/.gitkeep b/extensions/suspend/tests/unit/.gitkeep
new file mode 100644
index 000000000..e69de29bb