diff --git a/composer.json b/composer.json
index 463353e..acc3fe4 100644
--- a/composer.json
+++ b/composer.json
@@ -31,6 +31,11 @@
             "src/Deployer/functions.php"
         ]
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Hypernode\\Deploy\\": "tests/unit"
+        }
+    },
     "require-dev": {
         "phpunit/phpunit": "^8.5",
         "roave/security-advisories": "dev-master"
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..a9b17c3
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,10 @@
+<phpunit
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
+         verbose="false">
+	<testsuites>
+		<testsuite name="unit">
+			<directory suffix="Test.php">tests/unit</directory>
+		</testsuite>
+  </testsuites>
+</phpunit>
diff --git a/tests/unit/Command/BuildTest.php b/tests/unit/Command/BuildTest.php
new file mode 100644
index 0000000..4b64b7d
--- /dev/null
+++ b/tests/unit/Command/BuildTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Hypernode\Deploy\Command;
+
+use Hypernode\Deploy\DeployRunner;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class BuildTest extends TestCase
+{
+    /**
+     * @var DeployRunner|MockObject
+     */
+    private $deployRunner;
+    /**
+     * @var InputInterface|MockObject
+     */
+    private $input;
+    /**
+     * @var OutputInterface|MockObject
+     */
+    private $output;
+
+    /**
+     * @var Build
+     */
+    private $command;
+
+    protected function setUp(): void
+    {
+        $this->deployRunner = $this->createMock(DeployRunner::class);
+        $this->input = $this->createMock(InputInterface::class);
+        $this->output = $this->createMock(OutputInterface::class);
+        $this->command = new Build($this->deployRunner);
+    }
+
+    public function test_it_calls_deploy_runner_correctly()
+    {
+        $this->deployRunner->expects($this->once())
+            ->method('run')
+            ->with($this->output, 'build', 'build');
+            
+        $this->command->run($this->input, $this->output);
+    }
+
+    public function test_it_returns_zero()
+    {
+        $this->assertEquals(0, $this->command->run($this->input, $this->output));
+    }
+}
diff --git a/tests/unit/Command/ComposerAuthTest.php b/tests/unit/Command/ComposerAuthTest.php
new file mode 100644
index 0000000..2b981cb
--- /dev/null
+++ b/tests/unit/Command/ComposerAuthTest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Hypernode\Deploy\Command;
+
+use Hypernode\Deploy\DeployRunner;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class ComposerAuthTest extends TestCase
+{
+    /**
+     * @var DeployRunner|MockObject
+     */
+    private $deployRunner;
+    /**
+     * @var InputInterface|MockObject
+     */
+    private $input;
+    /**
+     * @var OutputInterface|MockObject
+     */
+    private $output;
+
+    /**
+     * @var Build
+     */
+    private $command;
+
+    protected function setUp(): void
+    {
+        $this->deployRunner = $this->createMock(DeployRunner::class);
+        $this->input = $this->createMock(InputInterface::class);
+        $this->output = $this->createMock(OutputInterface::class);
+        $this->command = new ComposerAuth($this->deployRunner);
+    }
+
+    public function test_it_calls_deploy_runner_correctly()
+    {
+        $this->deployRunner->expects($this->once())
+            ->method('run')
+            ->with($this->output, 'build', 'deploy:vendors:auth');
+            
+        $this->command->run($this->input, $this->output);
+    }
+
+    public function test_it_returns_zero()
+    {
+        $this->assertEquals(0, $this->command->run($this->input, $this->output));
+    }
+}
diff --git a/tests/unit/Command/DeployTest.php b/tests/unit/Command/DeployTest.php
new file mode 100644
index 0000000..3948c8f
--- /dev/null
+++ b/tests/unit/Command/DeployTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Hypernode\Deploy\Command;
+
+use Hypernode\Deploy\DeployRunner;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class DeployTest extends TestCase
+{
+    /**
+     * @var DeployRunner|MockObject
+     */
+    private $deployRunner;
+    /**
+     * @var InputInterface|MockObject
+     */
+    private $input;
+    /**
+     * @var OutputInterface|MockObject
+     */
+    private $output;
+
+    /**
+     * @var Build
+     */
+    private $command;
+
+    protected function setUp(): void
+    {
+        $this->deployRunner = $this->createMock(DeployRunner::class);
+        $this->input = $this->createMock(InputInterface::class);
+        $this->output = $this->createMock(OutputInterface::class);
+        $this->command = new Deploy($this->deployRunner);
+    }
+
+    protected function assertPreConditions(): void
+    {
+        $this->input->expects($this->once())
+            ->method('getArgument')
+            ->with('stage')
+            ->willReturn('production');
+    }
+
+    public function test_it_calls_deploy_runner_correctly()
+    {
+        $this->deployRunner->expects($this->once())
+            ->method('run')
+            ->with($this->output, 'production', 'deploy');
+
+        $this->command->run($this->input, $this->output);
+    }
+
+    public function test_it_returns_zero()
+    {
+        $this->assertEquals(0, $this->command->run($this->input, $this->output));
+    }
+}
diff --git a/tests/unit/Command/RunTaskTest.php b/tests/unit/Command/RunTaskTest.php
new file mode 100644
index 0000000..d8c188e
--- /dev/null
+++ b/tests/unit/Command/RunTaskTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Hypernode\Deploy\Command;
+
+use Hypernode\Deploy\DeployRunner;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class RunTaskTest extends TestCase
+{
+    /**
+     * @var DeployRunner|MockObject
+     */
+    private $deployRunner;
+    /**
+     * @var InputInterface|MockObject
+     */
+    private $input;
+    /**
+     * @var OutputInterface|MockObject
+     */
+    private $output;
+
+    /**
+     * @var Build
+     */
+    private $command;
+
+    protected function setUp(): void
+    {
+        $this->deployRunner = $this->createMock(DeployRunner::class);
+        $this->input = $this->createMock(InputInterface::class);
+        $this->output = $this->createMock(OutputInterface::class);
+        $this->command = new RunTask($this->deployRunner);
+    }
+
+    protected function assertPreConditions(): void
+    {
+        $this->input->expects($this->exactly(2))
+            ->method('getArgument')
+            ->withConsecutive(['stage'], ['task'])
+            ->willReturnOnConsecutiveCalls('production', 'sample_task');
+    }
+
+    public function test_it_calls_deploy_runner_correctly()
+    {
+        $this->deployRunner->expects($this->once())
+            ->method('run')
+            ->with($this->output, 'production', 'sample_task');
+
+        $this->command->run($this->input, $this->output);
+    }
+
+    public function test_it_returns_zero()
+    {
+        $this->assertEquals(0, $this->command->run($this->input, $this->output));
+    }
+}