diff --git a/tests/Unit/Core/Configuration/ValueResolver/ArgvValueResolverTest.php b/tests/Unit/Core/Configuration/ValueResolver/ArgvValueResolverTest.php
new file mode 100644
index 00000000..574d9e69
--- /dev/null
+++ b/tests/Unit/Core/Configuration/ValueResolver/ArgvValueResolverTest.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Test\Unit\Core\Configuration\ValueResolver;
+
+use BumbleDocGen\Core\Configuration\ConfigurationParameterBag;
+use BumbleDocGen\Core\Configuration\ValueResolver\ArgvValueResolver;
+use BumbleDocGen\DocGeneratorFactory;
+use PHPUnit\Framework\TestCase;
+
+class ArgvValueResolverTest extends TestCase
+{
+    protected ArgvValueResolver $argvValueResolver;
+    protected ConfigurationParameterBag $configurationParameterBag;
+
+    public static function setUpBeforeClass(): void
+    {
+        \DG\BypassFinals::enable();
+    }
+
+    public function setUp(): void
+    {
+        $_SERVER['argv'] += [
+            8 => '/home/john/foo',
+            9 => '/bin/phpunit'
+        ];
+        $this->argvValueResolver = new ArgvValueResolver();
+        $this->configurationParameterBag = $this->createMock(ConfigurationParameterBag::class);
+    }
+
+    /**
+     * @dataProvider dataProviderCollection
+     */
+    public function testArgvValueResolver($value, $expected): void
+    {
+        $resolvedValue = $this->argvValueResolver->resolveValue(
+            $this->configurationParameterBag,
+            $value
+        );
+
+        if (is_array($value) && is_array($expected)) {
+            foreach ($expected as $key => $val) {
+                $this->assertEquals($val, $resolvedValue[$key]);
+            }
+
+            return;
+        }
+
+        $this->assertEquals($expected, $resolvedValue);
+    }
+
+    public function dataProviderCollection(): array
+    {
+        return [
+            'testSingleValue' => [
+                '$value' => '%argv:8%/docs',
+                '$expected' => '/home/john/foo/docs',
+            ],
+            'testArrayWithPlaceholder' => [
+                '$value' => [
+                    'project_root' => '%argv:8%/test',
+                    'output_dir' => '%argv:9%/docs',
+                ],
+                '$expected' => [
+                    'project_root' => '/home/john/foo/test',
+                    'output_dir' => '/bin/phpunit/docs',
+                ],
+            ],
+            'testSingleValueWithoutPlaceholder' => [
+                '$value' => 'docs',
+                '$expected' => 'docs',
+            ],
+            'testDefaultValue' => [
+                '$value' => false,
+                '$expected' => false,
+            ],
+        ];
+    }
+}
diff --git a/tests/Unit/Core/Configuration/ValueResolver/InternalValueResolverTest.php b/tests/Unit/Core/Configuration/ValueResolver/InternalValueResolverTest.php
new file mode 100644
index 00000000..18db307b
--- /dev/null
+++ b/tests/Unit/Core/Configuration/ValueResolver/InternalValueResolverTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Test\Unit\Core\Configuration\ValueResolver;
+
+use BumbleDocGen\Core\Configuration\ConfigurationParameterBag;
+use BumbleDocGen\Core\Configuration\ValueResolver\InternalValueResolver;
+use BumbleDocGen\DocGeneratorFactory;
+use PHPUnit\Framework\TestCase;
+
+class InternalValueResolverTest extends TestCase
+{
+    protected InternalValueResolver $internalValueResolver;
+    protected ConfigurationParameterBag $configurationParameterBag;
+
+    public static function setUpBeforeClass(): void
+    {
+        \DG\BypassFinals::enable();
+    }
+
+    public function setUp(): void
+    {
+        $this->internalValueResolver = new InternalValueResolver([
+            'WORKING_DIR'   => '/home/john/foo',
+            'bin'           => '/bin/phpunit'
+        ]);
+        $this->configurationParameterBag = $this->createMock(ConfigurationParameterBag::class);
+    }
+
+    /**
+     * @dataProvider dataProviderCollection
+     */
+    public function testArgvValueResolver($value, $expected): void
+    {
+        $resolvedValue = $this->internalValueResolver->resolveValue(
+            $this->configurationParameterBag,
+            $value
+        );
+
+        if (is_array($value) && is_array($expected)) {
+            foreach ($expected as $key => $val) {
+                $this->assertEquals($val, $resolvedValue[$key]);
+            }
+
+            return;
+        }
+
+        $this->assertEquals($expected, $resolvedValue);
+    }
+
+    public function dataProviderCollection(): array
+    {
+        return [
+            'testSingleValue' => [
+                '$value' => '%WORKING_DIR%/docs',
+                '$expected' => '/home/john/foo/docs',
+            ],
+            'testSingleValueWithoutPlaceholder' => [
+                '$value' => 'docs',
+                '$expected' => 'docs',
+            ],
+            'testArrayWithPlaceholder' => [
+                '$value' => [
+                    'project_root' => '%WORKING_DIR%/test',
+                    'output_dir' => '%bin%/docs',
+                ],
+                '$expected' => [
+                    'project_root' => '/home/john/foo/test',
+                    'output_dir' => '/bin/phpunit/docs',
+                ],
+            ],
+            'testDefaultValue' => [
+                '$value' => false,
+                '$expected' => false,
+            ],
+        ];
+    }
+}
diff --git a/tests/Unit/Core/Configuration/ValueResolver/RefValueResolverTest.php b/tests/Unit/Core/Configuration/ValueResolver/RefValueResolverTest.php
new file mode 100644
index 00000000..01f01d13
--- /dev/null
+++ b/tests/Unit/Core/Configuration/ValueResolver/RefValueResolverTest.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace Test\Unit\Core\Configuration\ValueResolver;
+
+use BumbleDocGen\Core\Configuration\ConfigurationParameterBag;
+use BumbleDocGen\Core\Configuration\ValueResolver\RefValueResolver;
+use BumbleDocGen\DocGeneratorFactory;
+use DI\Container;
+use PHPUnit\Framework\TestCase;
+
+class RefValueResolverTest extends TestCase
+{
+    protected RefValueResolver $refValueResolver;
+    protected ConfigurationParameterBag $configurationParameterBag;
+
+    public static function setUpBeforeClass(): void
+    {
+        \DG\BypassFinals::enable();
+    }
+
+    public function setUp(): void
+    {
+        $this->refValueResolver = new RefValueResolver();
+        $this->configurationParameterBag = $this->createMock(ConfigurationParameterBag::class);
+        $this->configurationParameterBag->expects($this->any())->method('get')->willReturn('test');
+    }
+
+    /**
+     * @dataProvider dataProviderCollection
+     */
+    public function testRefValueResolver($value, $expected): void
+    {
+        $resolvedValue = $this->refValueResolver->resolveValue(
+            $this->configurationParameterBag,
+            $value
+        );
+
+        if (is_array($value) && is_array($expected)) {
+            foreach ($expected as $key => $val) {
+                $this->assertEquals($val, $resolvedValue[$key]);
+            }
+
+            return;
+        }
+
+        $this->assertEquals($expected, $resolvedValue);
+    }
+
+    public function dataProviderCollection(): array
+    {
+        return [
+            'testSingleValue' => [
+                '$value' => '%project_root%/docs',
+                '$expected' => 'test/docs',
+            ],
+            'testArrayWithPlaceholder' => [
+                '$value' => [
+                    'project_root' => 'test',
+                    'output_dir' => '%project_root%/docs',
+                ],
+                '$expected' => [
+                    'project_root' => 'test',
+                    'output_dir' => 'test/docs',
+                ],
+            ],
+            'testSingleValueWithoutPlaceholder' => [
+                '$value' => 'docs',
+                '$expected' => 'docs',
+            ],
+            'testDefaultValue' => [
+                '$value' => false,
+                '$expected' => false,
+            ],
+        ];
+    }
+}