add vagrant validate

tests/test_vagrant.py

@@ -290,6 +290,14 @@ def test_vm_lifecycle(vm_dir):
     assert v.NOT_CREATED == v.status()[0].state
 
 
+def test_valid_config(vm_dir):
+    v = vagrant.Vagrant(vm_dir)
+    v.up()
+    validation = v.validate(vm_dir)
+
+    assert validation.returncode == 0
+
+
 def test_vm_config(vm_dir):
     """
     Test methods retrieving ssh config settings, like user, hostname, and port.

vagrant/__init__.py

@@ -876,6 +876,20 @@ def plugin_list(self):
         output = self._run_vagrant_command(["plugin", "list", "--machine-readable"])
         return self._parse_plugin_list(output)
 
+    def validate(self, directory):
+        """
+        This command validates present Vagrantfile.
+        """
+        validate = subprocess.run(
+            ["vagrant", "validate"],
+            cwd=directory,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+        )
+
+        return validate
+
     def _parse_plugin_list(self, output):
         """
         Remove Vagrant from the equation for unit testing.