diff --git a/src/Generator/DataProviderGenerator.php b/src/Generator/DataProviderGenerator.php
index 1e9d155..a1543c3 100644
--- a/src/Generator/DataProviderGenerator.php
+++ b/src/Generator/DataProviderGenerator.php
@@ -395,7 +395,7 @@ public function generate(): ?string
             }
             $defaultArgs = null;
 
-            if (isset($dataProvider['dataProviderMethods'][self::DATA_PROVIDER_DEFAULT_ARGS])) {
+            if (!empty($dataProvider['dataProviderMethods'][self::DATA_PROVIDER_DEFAULT_ARGS])) {
                 $defaultArgs = $dataProvider['dataProviderMethods'][self::DATA_PROVIDER_DEFAULT_ARGS];
                 unset($dataProvider['dataProviderMethods'][self::DATA_PROVIDER_DEFAULT_ARGS]);
             }
diff --git a/src/Generator/Helper/CodeHelper.php b/src/Generator/Helper/CodeHelper.php
index f79e05e..64464e9 100644
--- a/src/Generator/Helper/CodeHelper.php
+++ b/src/Generator/Helper/CodeHelper.php
@@ -292,8 +292,9 @@ public function getNamespacesFromSource(string $sourceName): array
                         continue;
                     }
 
-                    if (is_array($useToken) && T_STRING === $useToken[0]) {
+                    if (is_array($useToken) && T_NAME_QUALIFIED === $useToken[0]) {
                         $useToken[1] = trim($useToken[1]);
+
                         if (!$namespaceFinish) {
                             $namespace[] = $useToken[1];
                         } else {
@@ -349,7 +350,7 @@ public function getNamespacesFromSource(string $sourceName): array
     private function parseUseStatements(ReflectionClass $reflection): array
     {
         if (!defined('T_NAME_QUALIFIED')) {
-            define('T_NAME_QUALIFIED', 314);
+            define('T_NAME_QUALIFIED', 311);
         }
         $filename = $reflection->getFileName();
 
@@ -375,6 +376,7 @@ private function parseUseStatements(ReflectionClass $reflection): array
         foreach ($tokens as $token) {
             if (T_NAMESPACE === $token[0]) {
                 $buildingNamespace = true;
+
                 if ($matchedNamespace) {
                     break;
                 }
diff --git a/src/Generator/Mock/Mockery.php b/src/Generator/Mock/Mockery.php
index 6a736c2..f1bde5f 100644
--- a/src/Generator/Mock/Mockery.php
+++ b/src/Generator/Mock/Mockery.php
@@ -177,12 +177,16 @@ public function generateMockCode(
                     }
 
                     if (class_exists($returnType) || interface_exists($returnType)) {
-                        $filename = $reflection->getFileName();
+                        $refNamespaces = [];
 
-                        if (false === $filename) {
-                            throw new FileNotExistsException(sprintf('File \'%s\' does not exists.', $reflection->getName()));
+                        if (!$reflection->isInternal()) {
+                            $filename = $reflection->getFileName();
+
+                            if (false === $filename) {
+                                throw new FileNotExistsException(sprintf('File \'%s\' does not exist.', $reflection->getName()));
+                            }
+                            $refNamespaces = $this->getNamespacesFromSource($filename);
                         }
-                        $refNamespaces = $this->getNamespacesFromSource($filename);
                         $namespacesFromParentClassesAndTraits = $this->getNamespacesFromParentClassesAndTraits($reflection);
                         $namespaces = array_merge($parentNamespaces, $refNamespaces, $namespacesFromParentClassesAndTraits);
                         $refMockName = $mockGenerator->addMock($returnType, $reflection, $refMethod, $namespaces, $level, $parentClass);
@@ -230,12 +234,16 @@ public function generateMockCode(
 
                         break;
                     }
-                    $filename = $reflection->getFileName();
+                    $refNamespaces = [];
 
-                    if (false === $filename) {
-                        throw new FileNotExistsException(sprintf('File \'%s\' does not exists.', $reflection->getName()));
+                    if (!$reflection->isInternal()) {
+                        $filename = $reflection->getFileName();
+
+                        if (false === $filename) {
+                            throw new FileNotExistsException(sprintf('File \'%s\' does not exist.', $reflection->getName()));
+                        }
+                        $refNamespaces = $this->getNamespacesFromSource($filename);
                     }
-                    $refNamespaces = $this->getNamespacesFromSource($filename);
                     $namespacesFromParentClassesAndTraits = $this->getNamespacesFromParentClassesAndTraits($reflection);
                     $namespaces = array_merge($parentNamespaces, $refNamespaces, $namespacesFromParentClassesAndTraits);
                     $refMockName = $mockGenerator->addMock($returnType, $reflection, $refMethod, $namespaces, $level, $parentClass);
diff --git a/src/Service/TestClass.php b/src/Service/TestClass.php
index 6ef37c4..a471730 100644
--- a/src/Service/TestClass.php
+++ b/src/Service/TestClass.php
@@ -251,11 +251,11 @@ private function getTestPathFromSource(string $sourcePath, string $namespace): a
                 $treePath = array_reverse(explode(DIRECTORY_SEPARATOR, $sourcePath));
                 $treeNamespace = array_reverse(explode(DIRECTORY_SEPARATOR, $namespace));
                 $sourcePath = [];
-                $testFolderPosition = count($treePath) + 1;
+                $testFolderPosition = 0;
 
                 foreach ($treePath as $i => $part) {
                     if ($part === $treeNamespace[$i]) {
-                        --$testFolderPosition;
+                        ++$testFolderPosition;
 
                         continue;
                     }
@@ -275,14 +275,14 @@ private function getTestPathFromSource(string $sourcePath, string $namespace): a
         $mockTestPath = $testPath . DIRECTORY_SEPARATOR . self::DEFAULT_MOCK_NAMESPACE;
         $namespace = explode(DIRECTORY_SEPARATOR, $namespace);
         $projectNamespace = $namespace;
-        $baseNamespace = array_splice($projectNamespace, -$testFolderPosition+1);
+        $baseNamespace = array_splice($projectNamespace, -$testFolderPosition);
         $basePath = implode(DIRECTORY_SEPARATOR, $baseNamespace);
         $baseNamespace = implode('\\', $baseNamespace);
         $projectNamespace = implode('\\', $projectNamespace);
         $dataProviderNamespace = $projectNamespace . '\\' . self::DEFAULT_TEST_NAMESPACE . '\\' . $this->unitTestFolder . '\\' . self::DEFAULT_DATA_PROVIDER_NAMESPACE;
         $mockNamespace = $projectNamespace . '\\' . self::DEFAULT_TEST_NAMESPACE . '\\' . $this->unitTestFolder . '\\' . self::DEFAULT_MOCK_NAMESPACE;
         $baseTestNamespace = $projectNamespace . '\\' . self::DEFAULT_TEST_NAMESPACE . '\\' . $this->unitTestFolder;
-        array_splice($namespace, -$testFolderPosition+1, 0, [self::DEFAULT_TEST_NAMESPACE, $this->unitTestFolder]);
+        array_splice($namespace, -$testFolderPosition, 0, [self::DEFAULT_TEST_NAMESPACE, $this->unitTestFolder]);
         $testNamespace = implode('\\', $namespace);
         $localTestPath .= self::DEFAULT_TEST_NAMESPACE . DIRECTORY_SEPARATOR . $this->unitTestFolder;
         $testPath .= DIRECTORY_SEPARATOR . $basePath;