diff --git a/.gitignore b/.gitignore
index 78cfa55..cd96214 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,6 @@
 
 # Composer files:
 /vendor/
+
+# PHPUnit files:
+.phpunit.result.cache
diff --git a/bin/pb-dydns.php b/bin/pb-dydns.php
index d74f2af..0b44cce 100755
--- a/bin/pb-dydns.php
+++ b/bin/pb-dydns.php
@@ -11,4 +11,4 @@ $config = new Config(__DIR__ . "/../config/pb-dydns.json");
 $logger = new Logger(__DIR__ . "/../logs/pb-dydns.log");
 
 $cmd = new UpdateDnsCommand($config, $logger);
-$cmd->run($argv);
+exit($cmd->run($argv));
diff --git a/composer.json b/composer.json
index c15ba43..606516c 100644
--- a/composer.json
+++ b/composer.json
@@ -9,5 +9,8 @@
 			"App\\": "src/"
 		}
 	},
-	"require": {}
+	"require-dev":
+	{
+		"phpunit/phpunit": "^12.5"
+	}
 }
diff --git a/composer.lock b/composer.lock
index 0cd2bf5..732d162 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,9 +4,1681 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
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+            },
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+            },
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+                "bin/php-parse"
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+            "extra": {
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+                    "dev-master": "5.x-dev"
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+                }
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+                "php"
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+                "reference": "1effe8e9b8e068e9ae228e542d5d11b5d16db894"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/1effe8e9b8e068e9ae228e542d5d11b5d16db894",
+                "reference": "1effe8e9b8e068e9ae228e542d5d11b5d16db894",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3",
+                "sebastian/object-reflector": "^5.0",
+                "sebastian/recursion-context": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/7.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:57:48+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "4bfa827c969c98be1e527abd576533293c634f6a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/4bfa827c969c98be1e527abd576533293c634f6a",
+                "reference": "4bfa827c969c98be1e527abd576533293c634f6a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:58:17+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "7.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "0b01998a7d5b1f122911a66bebcb8d46f0c82d8c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/0b01998a7d5b1f122911a66bebcb8d46f0c82d8c",
+                "reference": "0b01998a7d5b1f122911a66bebcb8d46f0c82d8c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/7.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/recursion-context",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-13T04:44:59+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "6.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "e549163b9760b8f71f191651d22acf32d56d6d4d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/e549163b9760b8f71f191651d22acf32d56d6d4d",
+                "reference": "e549163b9760b8f71f191651d22acf32d56d6d4d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/6.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/sebastian/type",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-09T06:57:12+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "3e6ccf7657d4f0a59200564b08cead899313b53c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/3e6ccf7657d4f0a59200564b08cead899313b53c",
+                "reference": "3e6ccf7657d4f0a59200564b08cead899313b53c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T05:00:38+00:00"
+        },
+        {
+            "name": "staabm/side-effects-detector",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/staabm/side-effects-detector.git",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/staabm/side-effects-detector/zipball/d8334211a140ce329c13726d4a715adbddd0a163",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/extension-installer": "^1.4.3",
+                "phpstan/phpstan": "^1.12.6",
+                "phpunit/phpunit": "^9.6.21",
+                "symfony/var-dumper": "^5.4.43",
+                "tomasvotruba/type-coverage": "1.0.0",
+                "tomasvotruba/unused-public": "1.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "lib/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A static analysis tool to detect side effects in PHP code",
+            "keywords": [
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/staabm/side-effects-detector/issues",
+                "source": "https://github.com/staabm/side-effects-detector/tree/1.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/staabm",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-20T05:08:20+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "7989e43bf381af0eac72e4f0ca5bcbfa81658be4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/7989e43bf381af0eac72e4f0ca5bcbfa81658be4",
+                "reference": "7989e43bf381af0eac72e4f0ca5bcbfa81658be4",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^8.1"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/2.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-12-08T11:19:18+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {},
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..58b3b9c
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php" colors="true" verbose="true" backupGlobals="false" backupStaticAttributes="false">
+	<testsuites>
+		<testsuite name="pb-dydns Test Suite">
+			<directory>tests</directory>
+		</testsuite>
+	</testsuites>
+</phpunit>
diff --git a/src/Command/UpdateDnsCommand.php b/src/Command/UpdateDnsCommand.php
index 9545937..7af7bc3 100644
--- a/src/Command/UpdateDnsCommand.php
+++ b/src/Command/UpdateDnsCommand.php
@@ -9,6 +9,10 @@ use App\Util\Console;
 
 class UpdateDnsCommand
 {
+	public const STATUS_NOTHING_TO_CHANGE = 0;
+	public const STATUS_UPDATED = 1;
+	public const STATUS_ERROR = 2;
+
 	private Config $config;
 	private Logger $logger;
 
@@ -18,61 +22,69 @@ class UpdateDnsCommand
 		$this->logger = $logger;
 	}
 
-	public function run(array $argv): void
+	public function run(array $argv, ?PorkbunAPI $api = null, ?string $myIp = null): int
 	{
 		if (count($argv) < 2)
 		{
 			echo "Usage: pb-dydns.php <domain>\n";
-			exit(1);
+			return self::STATUS_ERROR;
 		}
 
 		$domain = $argv[1];
 
-		$api = new PorkbunAPI($this->config->get('config_filename'));
+		// Allow API injection for tests:
+		$api = $api ?? new PorkbunAPI($this->config->get('config_filename'));
 
-		// Test connection to Porkbun API in order to get the public IP:
+		// 1. Test connection to Porkbun API in order to get the public IP:
 		$raw = $api->ping();
 		$result = json_decode($raw);
 
 		if ($result === null)
 		{
 			Console::echo("Invalid JSON returned by Porkbun API:\n$raw\n");
-			exit(3);
+			return self::STATUS_ERROR;
 		}
 
 		if (!isset($result->status))
 		{
 			Console::echo("Porkbun API response missing 'status' field:\n$raw\n");
-			exit(3);
+			return self::STATUS_ERROR;
 		}
 
 		if ($result->status !== "SUCCESS") 
 		{
 			Console::echo("Porkbun API returned an error:\n$raw\n");
-			exit(3);
+			return self::STATUS_ERROR;
 		}
 
 		if (!isset($result->yourIp))
 		{
 			Console::echo("Porkbun API did not return your public IP.\n");
-			exit(3);
+			return self::STATUS_ERROR;
 		}
 
-		$myIp = $result->yourIp;
+		$myIp = $myIp ?? $result->yourIp;
 
 		Console::echo("Your public IP address is $myIp" . PHP_EOL);
 
-		// Retrieve all DNS records associated with user's domain:
+		// 2. Retrieve all DNS records associated with user's domain:
 		$records = $api->retrieve($domain);
+		$data = json_decode($records);
+
+		if ($data === null || !isset($data->records))
+		{
+			Console::echo("Invalid DNS records returned by Porkbun API:\n$records\n");
+			return self::STATUS_ERROR;
+		}
 
 		// Discard those records that are not type "A":
-		$data = json_decode($records);
 		$filteredRecords = array_filter($data->records, function ($record)
 		{
-			return $record->type == "A";
+			return isset($record->type) && $record->type == "A";
 		});
 
-		// Update the records that passed the filter with the public IP:
+		// 3. Update the records that passed the filter with the public IP:
+		$updated = false;
 		foreach ($filteredRecords as $record)
 		{
 			Console::echo("Porkbun's DNS for $record->name is pointing to $record->content... ");
@@ -84,12 +96,17 @@ class UpdateDnsCommand
 				$name = rtrim(strstr($record->name, $domain, true), ".");
 				$result = json_decode($api->edit($domain, $record->id, $myIp, $name));
 
-				if ($result->status == "SUCCESS")
+				if ($result && isset($result->status) && $result->status === "SUCCESS")
 				{
-					Console::echo("Done!" . PHP_EOL);
+					Console::echo("Done!\n");
+					$this->logger->log("Updated DNS on $record->name from $record->content to $myIp");
+					$updated = true;
+				}
+				else
+				{
+					Console::echo("Failed!\n");
+					return self::STATUS_ERROR;
 				}
-
-				$this->logger->log("Updated DNS on $record->name from $record->content to $myIp");
 			}
 
 			else
@@ -99,5 +116,7 @@ class UpdateDnsCommand
 
 			Console::echo("");
 		}
+
+		return $updated ? self::STATUS_UPDATED : self::STATUS_NOTHING_TO_CHANGE;
 	}
 }
diff --git a/src/Config/Config.php b/src/Config/Config.php
index 26f4eed..803c8a3 100644
--- a/src/Config/Config.php
+++ b/src/Config/Config.php
@@ -16,12 +16,19 @@ class Config
 		}
 
 		$json = file_get_contents($filename);
-		$this->data = json_decode($json, true);
+		$data = json_decode($json, true);
 
-		if ($this->data === null)
+		if (json_last_error() !== JSON_ERROR_NONE)
+		{
+			throw new \RuntimeException("Invalid JSON in config file: " . json_last_error_msg());
+		}
+
+		if ($data === null)
 		{
 			throw new RuntimeException("Invalid JSON in config file: $filename");
 		}
+
+		$this->data = $data;
 	}
 
 	public function get(string $key): mixed
diff --git a/test/Api/.gitkeep b/test/Api/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/test/Command/.gitkeep b/test/Command/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/Api/PorkbunAPITest.php b/tests/Api/PorkbunAPITest.php
new file mode 100644
index 0000000..54f9339
--- /dev/null
+++ b/tests/Api/PorkbunAPITest.php
@@ -0,0 +1,101 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use App\Api\PorkbunAPI;
+
+class PorkbunAPITest extends TestCase
+{
+	private string $tmpConfig;
+
+	protected function setUp(): void
+	{
+		$this->tmpConfig = tempnam(sys_get_temp_dir(), 'cfg_');
+		file_put_contents($this->tmpConfig, json_encode([
+			"url" => "https://example.com/api/",
+			"apikey" => "TESTKEY",
+			"secretapikey" => "TESTSECRET"
+		]));
+	}
+
+	public function testPingBuildsCorrectEndpointAndReturnsValue()
+	{
+		$api = $this->getMockBuilder(PorkbunAPI::class)
+					->setConstructorArgs([$this->tmpConfig])
+					->onlyMethods(['ping'])
+					->getMock();
+
+		$api->expects($this->once())
+			->method('ping')
+			->willReturn('{"status":"SUCCESS"}');
+
+		$this->assertSame('{"status":"SUCCESS"}', $api->ping());
+	}
+
+	public function testCreateReturnsExpectedValue()
+	{
+		$api = $this->getMockBuilder(PorkbunAPI::class)
+					->setConstructorArgs([$this->tmpConfig])
+					->onlyMethods(['create'])
+					->getMock();
+
+		$api->expects($this->once())
+			->method('create')
+			->with("example.com", "www", "A", "1.2.3.4", 600)
+			->willReturn('{"status":"CREATED"}');
+
+		$result = $api->create("example.com", "www", "A", "1.2.3.4", 600);
+
+		$this->assertSame('{"status":"CREATED"}', $result);
+	}
+
+	public function testEditReturnsExpectedValue()
+	{
+		$api = $this->getMockBuilder(PorkbunAPI::class)
+					->setConstructorArgs([$this->tmpConfig])
+					->onlyMethods(['edit'])
+					->getMock();
+
+		$api->expects($this->once())
+			->method('edit')
+			->with("example.com", "123", "5.6.7.8", "www")
+			->willReturn('{"status":"EDITED"}');
+
+		$result = $api->edit("example.com", "123", "5.6.7.8", "www");
+
+		$this->assertSame('{"status":"EDITED"}', $result);
+	}
+
+	public function testRetrieveReturnsExpectedValue()
+	{
+		$api = $this->getMockBuilder(PorkbunAPI::class)
+					->setConstructorArgs([$this->tmpConfig])
+					->onlyMethods(['retrieve'])
+					->getMock();
+
+		$api->expects($this->once())
+			->method('retrieve')
+			->with("example.com", null)
+			->willReturn('{"records":[1,2,3]}');
+
+		$result = $api->retrieve("example.com");
+
+		$this->assertSame('{"records":[1,2,3]}', $result);
+	}
+
+	public function testRetrieveByNameTypeReturnsExpectedValue()
+	{
+		$api = $this->getMockBuilder(PorkbunAPI::class)
+					->setConstructorArgs([$this->tmpConfig])
+					->onlyMethods(['retrieveByNameType'])
+					->getMock();
+
+		$api->expects($this->once())
+			->method('retrieveByNameType')
+			->with("example.com", "A", "www")
+			->willReturn('{"records":["A","B"]}');
+
+		$result = $api->retrieveByNameType("example.com", "A", "www");
+
+		$this->assertSame('{"records":["A","B"]}', $result);
+	}
+}
diff --git a/tests/Command/UpdateDnsCommandTest.php b/tests/Command/UpdateDnsCommandTest.php
new file mode 100644
index 0000000..c9b4495
--- /dev/null
+++ b/tests/Command/UpdateDnsCommandTest.php
@@ -0,0 +1,79 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use App\Api\PorkbunAPI;
+use App\Command\UpdateDnsCommand;
+use App\Config\Config;
+use App\Util\Logger;
+
+class UpdateDnsCommandTest extends TestCase
+{
+	private $config;
+	private $logger;
+
+	protected function setUp(): void
+	{
+		$this->config = $this->createMock(Config::class);
+		$this->logger = $this->createMock(Logger::class);
+	}
+
+	// Scenario: DNS already matches public IP, so no update should occur:
+	public function testNoChangesNeeded()
+	{
+		$api = $this->createMock(PorkbunAPI::class);
+
+		// ping() must return yourIp or the command returns STATUS_ERROR immediately:
+		$api->method('ping')->willReturn('{"status":"SUCCESS","yourIp":"1.2.3.4"}');
+
+		// retrieve() must return JSON with a records array, otherwise json_decode() fails:
+		$api->method('retrieve')->willReturn(json_encode(
+			[
+				"records" => [
+				[
+					"name"	  => "test.example.com",
+					"type"	  => "A",
+					"content" => "1.2.3.4",
+					"id"	  => "123"
+				]
+			]
+		]));
+
+		$cmd = new UpdateDnsCommand($this->config, $this->logger);
+		$status = $cmd->run(["script.php", "example.com"], $api, "1.2.3.4");
+
+		$this->assertSame(UpdateDnsCommand::STATUS_NOTHING_TO_CHANGE, $status);
+	}
+
+	// Scenario: DNS is outdated, so edit() should be called and STATUS_UPDATED returned:
+	public function testDnsIsUpdated()
+	{
+		$api = $this->createMock(PorkbunAPI::class);
+
+		// ping() must return yourIp or the command returns STATUS_ERROR immediately:
+		$api->method('ping')->willReturn('{"status":"SUCCESS","yourIp":"1.2.3.4"}');
+
+		// retrieve() must return JSON with a records array, otherwise json_decode() fails:
+		$api->method('retrieve')->willReturn(json_encode(
+			[
+				"records" => [
+				[
+					"name"	  => "test.example.com",
+					"type"	  => "A",
+					"content" => "5.6.7.8",
+					"id"	  => "123"
+				]
+			]
+		]));
+
+		// edit() must return a SUCCESS status or the command returns STATUS_ERROR:
+		$api->method('edit')->willReturn(json_encode(["status" => "SUCCESS"]));
+		
+		// When DNS is updated, the command must record the change in the log exactly once:
+		$this->logger->expects($this->once())->method('log')->with($this->stringContains("Updated DNS"));
+
+		$cmd = new UpdateDnsCommand($this->config, $this->logger);
+		$status = $cmd->run(["script.php", "example.com"], $api, "1.2.3.4");
+
+		$this->assertSame(UpdateDnsCommand::STATUS_UPDATED, $status);
+	}
+}
diff --git a/tests/Config/ConfigTest.php b/tests/Config/ConfigTest.php
new file mode 100644
index 0000000..d5d4a53
--- /dev/null
+++ b/tests/Config/ConfigTest.php
@@ -0,0 +1,32 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use App\Config\Config;
+
+class ConfigTest extends TestCase
+{
+	public function testLoadsValidJson()
+	{
+		$tmp = tempnam(sys_get_temp_dir(), 'cfg_');
+		file_put_contents($tmp, json_encode(["foo" => "bar"]));
+
+		$config = new Config($tmp);
+
+		$this->assertSame("bar", $config->get("foo"));
+	}
+
+	public function testThrowsOnMissingFile()
+	{
+		$this->expectException(RuntimeException::class);
+		new Config("/nonexistent/file.json");
+	}
+
+	public function testThrowsOnInvalidJson()
+	{
+		$tmp = tempnam(sys_get_temp_dir(), 'cfg_');
+		file_put_contents($tmp, "{invalid json");
+
+		$this->expectException(RuntimeException::class);
+		new Config($tmp);
+	}
+}
diff --git a/tests/Util/LoggerTest.php b/tests/Util/LoggerTest.php
new file mode 100644
index 0000000..0324a0f
--- /dev/null
+++ b/tests/Util/LoggerTest.php
@@ -0,0 +1,19 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use App\Util\Logger;
+
+class LoggerTest extends TestCase
+{
+	public function testLogWritesMessage()
+	{
+		$tmp = tempnam(sys_get_temp_dir(), 'log_');
+		$logger = new Logger($tmp);
+
+		$logger->log("Hello world");
+
+		$contents = file_get_contents($tmp);
+
+		$this->assertStringContainsString("Hello world", $contents);
+	}
+}