diff --git a/tests/Composer/Test/Command/CheckPlatformReqsCommandTest.php b/tests/Composer/Test/Command/CheckPlatformReqsCommandTest.php
new file mode 100644
index 000000000..4fcbc639e
--- /dev/null
+++ b/tests/Composer/Test/Command/CheckPlatformReqsCommandTest.php
@@ -0,0 +1,93 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test\Command;
+
+use Composer\Test\TestCase;
+use LogicException;
+
+class CheckPlatformReqsCommandTest extends TestCase
+{
+    /**
+     * @dataProvider caseProvider
+     * @param array<mixed> $composerJson
+     * @param array<mixed> $command
+     */
+    public function testPlatformReqsAreSatisfied(
+        array $composerJson,
+        array $command,
+        string $expected,
+        bool $lock = true
+    ): void {
+        $this->initTempComposer($composerJson);
+
+        $packages = [
+            $this->getPackage('ext-foobar', '2.3.4'),
+        ];
+        $devPackages = [
+            $this->getPackage('ext-barbaz', '2.3.4.5')
+        ];
+
+        $this->createInstalledJson($packages, $devPackages);
+
+        if ($lock) {
+           $this->createComposerLock($packages, $devPackages);
+        }
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(array_merge(['command' => 'check-platform-reqs'], $command));
+
+        $appTester->assertCommandIsSuccessful();
+        $this->assertSame(trim($expected), trim($appTester->getDisplay(true)));
+    }
+
+    public function testExceptionThrownIfNoLockfileFound(): void
+    {
+        $this->expectException(LogicException::class);
+        $this->expectExceptionMessage("No lockfile found. Unable to read locked packages");
+        $this->initTempComposer([]);
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'check-platform-reqs']);
+    }
+
+    public function caseProvider(): \Generator
+    {
+        yield 'Disables checking of require-dev packages requirements.' => [
+            [
+                'require' => [
+                    'ext-foobar' => '^2.0',
+                ],
+                'require-dev' => [
+                    'ext-barbaz' => '~4.0',
+                ]
+            ],
+            ['--no-dev' => true],
+            'Checking non-dev platform requirements for packages in the vendor dir
+ext-foobar 2.3.4   success'
+        ];
+
+        yield 'Checks requirements only from the lock file, not from installed packages.' => [
+            [
+                'require' => [
+                    'ext-foobar' => '^2.3',
+                ],
+                'require-dev' => [
+                    'ext-barbaz' => '~2.0',
+                ]
+            ],
+            ['--lock' => true],
+            'Checking platform requirements using the lock file
+ext-barbaz 2.3.4.5   success 
+ext-foobar 2.3.4     success'
+        ];
+    }
+}