diff --git a/unittests/unittests_cli/install_test_case.py b/unittests/unittests_cli/install_test_case.py
index ceefbf4f..527256d1 100644
--- a/unittests/unittests_cli/install_test_case.py
+++ b/unittests/unittests_cli/install_test_case.py
@@ -64,6 +64,28 @@ class InstallTestCase(unittest.TestCase):
         self.assertIn(package_name, packages)
         self.assertEqual(version, packages[package_name])
 
+    def test_dev_install_package(self):
+        version = '1.7.3'
+        package_name = 'discord.py'
+        package = f'{package_name}=={version}'
+        CLICommands.install(package, is_dev=True)
+        settings = self._get_project_settings()
+        self.assertNotEqual(settings, {})
+        self.assertIn('ProjectSettings', settings)
+        self.assertIn('Dependencies', settings['ProjectSettings'])
+        self.assertIn('DevDependencies', settings['ProjectSettings'])
+        self.assertNotIn(
+            package,
+            settings['ProjectSettings']['Dependencies']
+        )
+        self.assertIn(
+            package,
+            settings['ProjectSettings']['DevDependencies']
+        )
+        packages = self._get_installed_packages()
+        self.assertIn(package_name, packages)
+        self.assertEqual(version, packages[package_name])
+
     def _test_install_all(self):
         version = '1.7.3'
         package_name = 'discord.py'
@@ -71,21 +93,33 @@ class InstallTestCase(unittest.TestCase):
         settings = self._get_project_settings()
         self.assertIn('ProjectSettings', settings)
         self.assertIn('Dependencies', settings['ProjectSettings'])
+        self.assertIn('DevDependencies', settings['ProjectSettings'])
+        self.assertNotIn(
+            package,
+            settings['ProjectSettings']['Dependencies']
+        )
+        self.assertIn('DevDependencies', settings['ProjectSettings'])
         self.assertNotIn(
             package,
             settings['ProjectSettings']['Dependencies']
         )
         settings['ProjectSettings']['Dependencies'].append(package)
+        settings['ProjectSettings']['DevDependencies'].append(package)
         self._save_project_settings(settings)
         CLICommands.install()
         new_settings = self._get_project_settings()
         self.assertEqual(settings, new_settings)
         self.assertIn('ProjectSettings', new_settings)
         self.assertIn('Dependencies', new_settings['ProjectSettings'])
+        self.assertIn('DevDependencies', new_settings['ProjectSettings'])
         self.assertIn(
             package,
             new_settings['ProjectSettings']['Dependencies']
         )
+        self.assertIn(
+            package,
+            new_settings['ProjectSettings']['DevDependencies']
+        )
         packages = self._get_installed_packages()
         self.assertIn(package_name, packages)
         self.assertEqual(version, packages[package_name])
diff --git a/unittests/unittests_cli/uninstall_test_case.py b/unittests/unittests_cli/uninstall_test_case.py
index ac29aaf3..d81bddf9 100644
--- a/unittests/unittests_cli/uninstall_test_case.py
+++ b/unittests/unittests_cli/uninstall_test_case.py
@@ -33,7 +33,6 @@ class UninstallTestCase(unittest.TestCase):
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
-        CLICommands.install(self._package)
 
     def cleanUp(self):
         # remove projects
@@ -47,6 +46,7 @@ class UninstallTestCase(unittest.TestCase):
         return dict([tuple(r.decode().split('==')) for r in reqs.split()])
 
     def test_uninstall(self):
+        CLICommands.install(self._package)
         CLICommands.uninstall(self._package)
         settings = self._get_project_settings()
         self.assertNotEqual(settings, {})
@@ -56,5 +56,28 @@ class UninstallTestCase(unittest.TestCase):
             self._package,
             settings['ProjectSettings']['Dependencies']
         )
+        self.assertNotIn(
+            self._package,
+            settings['ProjectSettings']['DevDependencies']
+        )
+        packages = self._get_installed_packages()
+        self.assertNotIn(self._package_name, packages)
+
+    def test_dev_uninstall(self):
+        CLICommands.install(self._package, is_dev=True)
+        CLICommands.uninstall(self._package, is_dev=True)
+        settings = self._get_project_settings()
+        self.assertNotEqual(settings, {})
+        self.assertIn('ProjectSettings', settings)
+        self.assertIn('Dependencies', settings['ProjectSettings'])
+        self.assertIn('DevDependencies', settings['ProjectSettings'])
+        self.assertNotIn(
+            self._package,
+            settings['ProjectSettings']['Dependencies']
+        )
+        self.assertNotIn(
+            self._package,
+            settings['ProjectSettings']['DevDependencies']
+        )
         packages = self._get_installed_packages()
         self.assertNotIn(self._package_name, packages)
diff --git a/unittests/unittests_shared/cli_commands.py b/unittests/unittests_shared/cli_commands.py
index a458390c..70570bc7 100644
--- a/unittests/unittests_shared/cli_commands.py
+++ b/unittests/unittests_shared/cli_commands.py
@@ -44,12 +44,12 @@ class CLICommands:
         cls._run('generate', schematic, name, output=output)
 
     @classmethod
-    def install(cls, package: str = None, output=False):
+    def install(cls, package: str = None, is_dev=False, output=False):
         if package is None:
             cls._run('install', output=output)
             return
 
-        cls._run('install', package, output=output)
+        cls._run('install', package, '--dev' if is_dev else '', output=output)
 
     @classmethod
     def new(cls, project_type: str, name: str, *args, output=False):
@@ -75,8 +75,8 @@ class CLICommands:
         cls._run('start', output=output)
 
     @classmethod
-    def uninstall(cls, package: str, output=False):
-        cls._run('uninstall', package, output=output)
+    def uninstall(cls, package: str, is_dev=False, output=False):
+        cls._run('uninstall', package, '--dev' if is_dev else '', output=output)
 
     @classmethod
     def update(cls, output=False):