diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 64d27b3..a1fa841 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -5,23 +5,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        # There is no code, we don't have to test old PHP versions
         php-versions:
-          - 5.3
-          - 5.4
-          - 5.5
-          - 5.6
-          - 7.0
-          - 7.1
-          - 7.2
-          - 7.3
           - 7.4
           - 8.0
+          - 8.1
         dependency-levels:
           - 'highest'
         experimental:
           - false
         include:
-          - php-versions: 5.4
+          - php-versions: 7.4
             dependency-levels: 'lowest'
             experimental: false
       fail-fast: false
@@ -41,10 +35,6 @@ jobs:
     - name: Validate composer.json and composer.lock
       run: composer validate
 
-      # Because PHPCS 3 requires PHP 5.4
-    - run: composer require --dev -W squizlabs/php_codesniffer:^2.0 symfony/yaml:^2.0 phpdocumentor/reflection-docblock:^2.0
-      if: matrix.php-versions == '5.3'
-
     - name: Install dependencies
       uses: ramsey/composer-install@v1
       with:
@@ -53,8 +43,3 @@ jobs:
 
     - name: PhpUnit
       run: ./vendor/bin/phpunit
-
-    - name: PHPCS
-      run: ./vendor/bin/phpcs -s --report-source --runtime-set ignore_warnings_on_exit 1
-      # Because PHPCS 2 does not have PSR-12 rule
-      if: matrix.php-versions != '5.3'
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b87b81c..f22ac53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,8 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [[*next-version*]] - YYYY-MM-DD
-Initial release. This ports the test for and from [`psr/log`][], according to
+## [1.0.0] - YYYY-MM-DD
+
+- Initial release. This ports the test for and from [`psr/log` v1.1][], according to
 [decision][1].
 
 
diff --git a/README.md b/README.md
index b08fa5e..e09c446 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,51 @@
 # PSR - Log Util
 Utilities for the [`psr/log`][] package that backs the [PSR-3][] specification.
 
+ * `Psr\Log\Test\LoggerInterfaceTest` provides a base test class for ensuring compliance with the LoggerInterface.
+ * `Psr\Log\Test\TestLogger` is a mock class for testing purposes.
+
+## Installation
+
+This package should be used only for tests.
+
+For PHP 8.0+ only, you may remove support for `psr/log: 1.x`:
+
+```json
+{
+  "require": {
+    "php": ">=8.0.0",
+    "psr/log": "^2.0 | ^3.0"
+  },
+  "require-dev": {
+    "psr/log-utils": "^1.1"
+  }
+}
+```
+
+If the project supports older versions of PHP:
+
+```json
+{
+  "require": {
+    "psr/log": "^1.1.14 | ^2.0"
+  },
+  "require-dev": {
+    "psr/log-utils": "^1.0"
+  }
+}
+```
+
+> **Note:** In `psr/log: 3.0.0`, `Psr\Log\LoggerInterface` has union types for method arguments.
+> Implementing this interface with PHP 7 compatibility is not possible.
+
+## Versions
+
+The version of `psr/log-utils` that is installed after composer dependencies resolution varies with the version of `psr/log`.
+
+| psr/log      | psr/log-utils |                                                 |
+|--------------|---------------|-------------------------------------------------|
+| `^1.1.14`    | `1.0.*`       | Empty package, classes a provided by `psr/log`. |
+| `^2.0|^3.0`  | `^1.1`        | Imports test classes removed from `psr/log`.    |
 
 [`psr/log`]: https://packagist.org/packages/psr/log
 [PSR-3]: https://www.php-fig.org/psr/psr-3/
diff --git a/composer.json b/composer.json
index 4b6ab0b..b0db5c7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,36 +1,25 @@
 {
   "name": "psr/log-util",
   "description": "Utilities for the psr/log package that backs the PSR-3 specification.",
-  "minimum-stability": "dev",
   "license": "MIT",
   "authors": [
     {
       "name": "PHP-FIG",
       "homepage": "https://www.php-fig.org/",
       "role": "Organisation"
-    },
-    {
-      "name": "Anton Ukhanev",
-      "email": "xedin.unknown@gmail.com",
-      "role": "Developer"
     }
   ],
   "require": {
     "php": "^5.3 | ^7.0 | ^8.0",
-    "psr/log": "^1.1.4"
+    "psr/log": "^1.1.1"
   },
   "require-dev": {
-    "phpunit/phpunit": "^4.0 | ^5.0 | ^6.0 | ^7.0 | ^8.0 | ^9.0",
+    "phpunit/phpunit": "^8.0 | ^9.0",
     "squizlabs/php_codesniffer": "^3.6"
   },
-  "autoload": {
-    "psr-4": {
-      "Psr\\Log\\Util\\": "src"
-    }
-  },
   "autoload-dev": {
     "psr-4": {
-      "Psr\\Log\\Util\\Tests\\": "tests"
+      "Psr\\Log\\Tests\\": "tests"
     }
   }
 }
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index b59c687..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,1425 +0,0 @@
-{
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
-        "This file is @generated automatically"
-    ],
-    "content-hash": "3c2a69ba41436642f49c2543f3ffa310",
-    "packages": [
-        {
-            "name": "psr/log",
-            "version": "dev-master",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/log.git",
-                "reference": "d49695b909c3b7628b6289db5479a1c204601f11"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/d49695b909c3b7628b6289db5479a1c204601f11",
-                "reference": "d49695b909c3b7628b6289db5479a1c204601f11",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "default-branch": true,
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.1.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Log\\": "Psr/Log/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
-                }
-            ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
-            "keywords": [
-                "log",
-                "psr",
-                "psr-3"
-            ],
-            "support": {
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-            },
-            "time": "2021-05-03T11:20:27+00:00"
-        }
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-            "version": "1.0.x-dev",
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-                "url": "https://github.com/doctrine/instantiator.git",
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-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3,<8.0-DEV"
-            },
-            "require-dev": {
-                "athletic/athletic": "~0.1.8",
-                "ext-pdo": "*",
-                "ext-phar": "*",
-                "phpunit/phpunit": "~4.0",
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-            },
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-            "extra": {
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-                }
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-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Marco Pivetta",
-                    "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
-                }
-            ],
-            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
-            "homepage": "https://github.com/doctrine/instantiator",
-            "keywords": [
-                "constructor",
-                "instantiate"
-            ],
-            "support": {
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-                "source": "https://github.com/doctrine/instantiator/tree/1.0.x"
-            },
-            "time": "2018-09-01T02:07:49+00:00"
-        },
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-            "version": "1.0.1",
-            "source": {
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-                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
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-            },
-            "require-dev": {
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-            },
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-                }
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-                    "phpDocumentor\\Reflection\\": [
-                        "src"
-                    ]
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Jaap van Otterdijk",
-                    "email": "opensource@ijaap.nl"
-                }
-            ],
-            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
-            "homepage": "http://www.phpdoc.org",
-            "keywords": [
-                "FQSEN",
-                "phpDocumentor",
-                "phpdoc",
-                "reflection",
-                "static analysis"
-            ],
-            "support": {
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-                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/master"
-            },
-            "time": "2017-09-11T18:02:19+00:00"
-        },
-        {
-            "name": "phpdocumentor/reflection-docblock",
-            "version": "3.2.2",
-            "source": {
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-                "webmozart/assert": "^1.0"
-            },
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-                    ]
-                }
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-            "license": [
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-            ],
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-                    "email": "me@mikevanriel.com"
-                }
-            ],
-            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "support": {
-                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
-                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/release/3.x"
-            },
-            "time": "2017-08-08T06:39:58+00:00"
-        },
-        {
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-            "source": {
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-                }
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-            "homepage": "https://github.com/phpspec/prophecy",
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-                "Dummy",
-                "fake",
-                "mock",
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-                "stub"
-            ],
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diff --git a/tests/Test/TestLoggerTest.php b/tests/Test/TestLoggerTest.php
new file mode 100644
index 0000000..b7cd975
--- /dev/null
+++ b/tests/Test/TestLoggerTest.php
@@ -0,0 +1,120 @@
+<?php
+
+namespace Psr\Log\Tests\Test;
+
+use Psr\Log\Test\LoggerInterfaceTest;
+use Psr\Log\Test\TestLogger;
+
+/**
+ * Test classes from psr/log 1.1.x
+ *
+ * @requires PHP 7.4
+ * @covers \Psr\Log\Test\TestLogger
+ * @covers \Psr\Log\Test\LoggerInterfaceTest
+ *
+ * @author Jérôme Tamarelle <jerome@tamarelle.net>
+ */
+class TestLoggerTest extends LoggerInterfaceTest
+{
+    private TestLogger $logger;
+
+    public function getLogger(): TestLogger
+    {
+        if (!isset($this->logger)) {
+            $this->logger = new TestLogger();
+        }
+
+        return $this->logger;
+    }
+
+    public function getLogs(): array
+    {
+        $logs = array();
+        foreach ($this->getLogger()->records as $record) {
+            // Interpolate context
+            $message = preg_replace_callback(
+                '!\{([^\}\s]*)\}!',
+                fn (array $matches): string => $record['context'][$matches[1] ?? null] ?? $matches[0],
+                $record['message']
+            );
+            $logs[] = $record['level'] . ' ' . $message;
+        }
+
+        return $logs;
+    }
+
+    public function testThrowsOnInvalidLevel(): void
+    {
+        self::markTestSkipped('TestLogger from psr/log 1.1 does not throw on invalid level.');
+    }
+
+    /**
+     * @dataProvider getLogLevels
+     */
+    public function testHasRecord(string $level): void
+    {
+        $levelMethod = 'has'.ucfirst($level);
+        $logger = $this->getLogger();
+
+        $this->assertFalse(call_user_func([$logger, $levelMethod.'Records']));
+
+        $logger->log($level, $level.' Message', ['foo' => 'bar']);
+        $logger->log($level, $level.' Hello');
+
+        $this->assertTrue(call_user_func([$logger, $levelMethod.'Records']));
+
+        $record = $level.' Message';
+        $this->assertTrue($logger->hasRecord($record, $level), 'hasRecord without context');
+        $this->assertTrue(call_user_func([$logger, $levelMethod], $record), $levelMethod.' without context');
+
+        $record = ['message' => $level.' Message'];
+        $this->assertTrue($logger->hasRecord($record, $level), 'hasRecord without context');
+        $this->assertTrue(call_user_func([$logger, $levelMethod], $record), $levelMethod.' without context');
+
+        $record = ['message' => $level.' Message', ['foo' => 'bar']];
+        $this->assertTrue($logger->hasRecord($record, $level),'hasRecord with context');
+        $this->assertTrue(call_user_func([$logger, $levelMethod], $record), $levelMethod.' with context');
+
+        $this->assertTrue(call_user_func([$logger, $levelMethod.'ThatContains'], 'Message'), $levelMethod.'ThatContains');
+        $this->assertTrue(call_user_func([$logger, $levelMethod.'ThatMatches'], '/^[a-z]+ Message$/i'), $levelMethod.'ThatMatches');
+        $this->assertTrue(call_user_func([$logger, $levelMethod.'ThatPasses'], fn (array $record) => $record['message'] === $level.' Message'), $levelMethod.'ThatMatches');
+    }
+
+    public function getLogLevels(): array
+    {
+        return [
+            ['debug'],
+            ['info'],
+            ['notice'],
+            ['warning'],
+            ['error'],
+            ['critical'],
+            ['alert'],
+            ['emergency'],
+        ];
+    }
+
+    public function testFalseHasRecord(): void
+    {
+        $logger = $this->getLogger();
+        $logger->debug('debug message');
+        $logger->debug('log message');
+        $logger->debug('log message with context', ['debug' => true]);
+        $logger->debug('log message with context', ['debug' => false]);
+        $logger->warning('log message');
+        $logger->warning('warning message');
+
+        $this->assertFalse($logger->hasAlert('my message'));
+        $this->assertFalse($logger->hasAlert(['message' => 'my message']));
+        $this->assertFalse($logger->hasAlertRecords());
+        $this->assertFalse($logger->hasAlertThatContains('my message'));
+        $this->assertFalse($logger->hasAlertThatMatches('/my message/'));
+        $this->assertFalse($logger->hasAlertThatPasses(fn (array $record) => true));
+
+        $this->assertFalse($logger->hasDebug('warning message'));
+        $this->assertFalse($logger->hasDebug(['message' => 'warning message']));
+        $this->assertFalse($logger->hasDebugThatContains('warning message'));
+        $this->assertFalse($logger->hasDebugThatMatches('/warning message/'));
+        $this->assertFalse($logger->hasDebugThatPasses(fn (array $record) => 'warning message' === $record['message']));
+    }
+}