diff --git a/tests/Composer/Test/Command/LicensesCommandTest.php b/tests/Composer/Test/Command/LicensesCommandTest.php
new file mode 100644
index 000000000..6043630b2
--- /dev/null
+++ b/tests/Composer/Test/Command/LicensesCommandTest.php
@@ -0,0 +1,183 @@
+<?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;
+
+class LicensesCommandTest extends TestCase
+{
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->initTempComposer([
+            'name' => 'test/pkg',
+            'license' => 'MIT',
+            'require' => [
+                'first/pkg' => '^2.0',
+                'second/pkg' => '3.*',
+                'third/pkg' => '^1.3',
+            ],
+            'require-dev' => [
+                'dev/pkg' => '~2.0',
+            ],
+        ]);
+
+        $first = $this->getPackage('first/pkg', '2.3.4');
+        $first->setLicense(['MIT']);
+
+        $second = $this->getPackage('second/pkg', '3.4.0');
+        $second->setLicense(['LGPL-2.0-only']);
+        $second->setHomepage('https://example.org');
+
+        $third = $this->getPackage('third/pkg', '1.5.4');
+
+        $dev = $this->getPackage('dev/pkg', '2.3.4.5');
+        $dev->setLicense(['MIT']);
+
+        $this->createInstalledJson([$first, $second, $third], [$dev]);
+        $this->createComposerLock([$first, $second, $third], [$dev]);
+    }
+
+    public function testBasicRun(): void
+    {
+        $appTester = $this->getApplicationTester();
+        $this->assertSame(0, $appTester->run(['command' => 'license']));
+
+        $expected = [
+            ["Name:", "test/pkg"],
+            ["Version:", "1.0.0+no-version-set"],
+            ["Licenses:", "MIT"],
+            ["Dependencies:"],
+            [],
+            ["Name", "Version", "Licenses"],
+            ["dev/pkg", "2.3.4.5", "MIT"],
+            ["first/pkg", "2.3.4", "MIT"],
+            ["second/pkg", "3.4.0", "LGPL-2.0-only"],
+            ["third/pkg", "1.5.4", "none"],
+        ];
+
+        array_walk_recursive($expected, static function (&$value) {
+            $value = preg_quote($value, '/');
+        });
+
+        foreach (explode(PHP_EOL, $appTester->getDisplay()) as $i => $line) {
+            if (trim($line) === '') {
+                continue;
+            }
+
+            $this->assertMatchesRegularExpression("/" . implode("\s+", $expected[$i]) . "/", $line);
+        }
+    }
+
+    public function testNoDev(): void
+    {
+        $appTester = $this->getApplicationTester();
+        $this->assertSame(0, $appTester->run(['command' => 'license', '--no-dev' => true]));
+
+        $expected = [
+            ["Name:", "test/pkg"],
+            ["Version:", "1.0.0+no-version-set"],
+            ["Licenses:", "MIT"],
+            ["Dependencies:"],
+            [],
+            ["Name", "Version", "Licenses"],
+            ["first/pkg", "2.3.4", "MIT"],
+            ["second/pkg", "3.4.0", "LGPL-2.0-only"],
+            ["third/pkg", "1.5.4", "none"],
+        ];
+
+        array_walk_recursive($expected, static function (&$value) {
+            $value = preg_quote($value, '/');
+        });
+
+        foreach (explode(PHP_EOL, $appTester->getDisplay()) as $i => $line) {
+            if (trim($line) === '') {
+                continue;
+            }
+
+            $this->assertMatchesRegularExpression("/" . implode("\s+", $expected[$i]) . "/", $line);
+        }
+    }
+
+    public function testFormatJson(): void
+    {
+        $appTester = $this->getApplicationTester();
+        $this->assertSame(0, $appTester->run(['command' => 'license', '--format' => 'json'], ['capture_stderr_separately' => true]));
+
+        $expected = [
+            "name" => "test/pkg",
+            "version" => "1.0.0+no-version-set",
+            "license" => ["MIT"],
+            "dependencies" => [
+                "dev/pkg" => [
+                    "version" => "2.3.4.5",
+                    "license" => [
+                        "MIT"
+                    ]
+                ],
+                "first/pkg" => [
+                    "version" => "2.3.4",
+                    "license" => [
+                        "MIT"
+                    ]
+                ],
+                "second/pkg" => [
+                    "version" => "3.4.0",
+                    "license" => [
+                        "LGPL-2.0-only"
+                    ]
+                ],
+                "third/pkg" => [
+                    "version" => "1.5.4",
+                    "license" => []
+                ]
+            ]
+        ];
+
+        $this->assertSame($expected, json_decode($appTester->getDisplay(), true));
+    }
+
+    public function testFormatSummary(): void
+    {
+        $appTester = $this->getApplicationTester();
+        $this->assertSame(0, $appTester->run(['command' => 'license', '--format' => 'summary']));
+
+        $expected = [
+            ['-', '-'],
+            ['License', 'Number of dependencies'],
+            ['-', '-'],
+            ['MIT', '2'],
+            ['LGPL-2.0-only', '1'],
+            ['none', '1'],
+            ['-', '-'],
+        ];
+
+        $lines = explode("\n", $appTester->getDisplay());
+
+        foreach ($expected as $i => $expect) {
+            [$key, $value] = $expect;
+
+            $this->assertMatchesRegularExpression("/$key\s+$value/", $lines[$i]);
+        }
+    }
+
+    public function testFormatUnknown(): void
+    {
+        $this->expectException(\RuntimeException::class);
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'license', '--format' => 'unknown']);
+    }
+}