Deduplicate method in OSC functional tests

Move construct_cmd method to base of functional tests.
Also fix typo in method name and refactor this method.

Change-Id: I352e7a4bcf439d290d6c1a31145d285102743eca

ironicclient/tests/functional/osc/v1/base.py

@@ -35,6 +35,10 @@ class TestCase(base.FunctionalTestBase):
         return ' -f {0} {1}'.format(output_format,
                                     ' '.join(['-c ' + it for it in fields]))
 
+    @staticmethod
+    def construct_cmd(*parts):
+        return ' '.join(str(x) for x in parts)
+
     def node_create(self, driver='fake', name=None, params=''):
         """Create baremetal node and add cleanup.
 

ironicclient/tests/functional/osc/v1/test_baremetal_node_create_negative.py

@@ -26,13 +26,6 @@ class BaremetalNodeCreateNegativeTests(base.TestCase):
     def setUp(self):
         super(BaremetalNodeCreateNegativeTests, self).setUp()
 
-    @staticmethod
-    def constuct_cmd(base_cmd, argument, value):
-        cmd = base_cmd
-        if argument:
-            cmd = '{0} {1} {2}'.format(cmd, argument, value)
-        return cmd
-
     @ddt.data(
         ('--uuid', '', 'expected one argument'),
         ('--uuid', '!@#$^*&%^', 'Expected a UUID'),
@@ -50,6 +43,6 @@ class BaremetalNodeCreateNegativeTests(base.TestCase):
     @ddt.unpack
     def test_baremetal_node_create(self, argument, value, ex_text):
         base_cmd = 'baremetal node create --driver fake'
-        command = self.constuct_cmd(base_cmd, argument, value)
+        command = self.construct_cmd(base_cmd, argument, value)
         six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                               self.openstack, command)

ironicclient/tests/functional/osc/v1/test_baremetal_node_negative.py

@@ -27,13 +27,6 @@ class BaremetalNodeNegativeTests(base.TestCase):
         super(BaremetalNodeNegativeTests, self).setUp()
         self.node = self.node_create()
 
-    @staticmethod
-    def constuct_cmd(base_cmd, argument, value):
-        cmd = base_cmd
-        if argument:
-            cmd = '{} {} {}'.format(cmd, argument, value)
-        return cmd
-
     @ddt.data(
         ('', '', 'error: argument --driver is required'),
         ('--driver', 'wrongdriver',
@@ -44,7 +37,7 @@ class BaremetalNodeNegativeTests(base.TestCase):
     def test_create_driver(self, argument, value, ex_text):
         """Negative test for baremetal node driver options."""
         base_cmd = 'baremetal node create'
-        command = self.constuct_cmd(base_cmd, argument, value)
+        command = self.construct_cmd(base_cmd, argument, value)
         six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                               self.openstack, command)
 
@@ -70,8 +63,8 @@ class BaremetalNodeNegativeTests(base.TestCase):
     def test_set_property(self, argument, value, ex_text):
         """Negative test for baremetal node set command options."""
         base_cmd = 'baremetal node set'
-        command = '{} {}'.format(
-            self.constuct_cmd(base_cmd, argument, value), self.node['uuid'])
+        command = self.construct_cmd(base_cmd, argument, value,
+                                     self.node['uuid'])
         six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                               self.openstack, command)
 
@@ -83,7 +76,7 @@ class BaremetalNodeNegativeTests(base.TestCase):
     def test_unset_property(self, argument, value, ex_text):
         """Negative test for baremetal node unset command options."""
         base_cmd = 'baremetal node unset'
-        command = '{} {}'.format(
-            self.constuct_cmd(base_cmd, argument, value), self.node['uuid'])
+        command = self.construct_cmd(base_cmd, argument, value,
+                                     self.node['uuid'])
         six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                               self.openstack, command)