tests.acceptance: adds multi vm capability for acceptance tests

This change adds the possibility to write acceptance tests with multi
virtual machine support. It's done keeping the virtual machines objects
stored in a test attribute (dictionary). This dictionary shouldn't be
accessed directly but through the new method added `get_vm`. This new
method accept a list of args (that will be added as virtual machine
arguments) and an optional name argument. The name is the key that
identify a single virtual machine along the test machines available. If
a name without a machine is informed a new machine will be instantiated.

The current usage of vm in tests will not be broken by this change since
it keeps a property called vm in the base test class. This property only
calls the new method `get_vm` with default parameters (no args and
'default' as machine name).

Signed-off-by: Caio Carrara <ccarrara@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20190212193855.13223-2-ccarrara@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>

1 files changed, 21 insertions, 4 deletions

diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index 28bfb8e9d3..a66ec72daa 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -10,6 +10,7 @@
 
 import os
 import sys
+import uuid
 
 import avocado
 
@@ -41,13 +42,29 @@ def pick_default_qemu_bin():
 
 class Test(avocado.Test):
     def setUp(self):
-        self.vm = None
+        self._vms = {}
         self.qemu_bin = self.params.get('qemu_bin',
                                         default=pick_default_qemu_bin())
         if self.qemu_bin is None:
             self.cancel("No QEMU binary defined or found in the source tree")
-        self.vm = QEMUMachine(self.qemu_bin)
+
+    def _new_vm(self, *args):
+        vm = QEMUMachine(self.qemu_bin)
+        if args:
+            vm.add_args(*args)
+        return vm
+
+    @property
+    def vm(self):
+        return self.get_vm(name='default')
+
+    def get_vm(self, *args, name=None):
+        if not name:
+            name = str(uuid.uuid4())
+        if self._vms.get(name) is None:
+            self._vms[name] = self._new_vm(*args)
+        return self._vms[name]
 
     def tearDown(self):
-        if self.vm is not None:
-            self.vm.shutdown()
+        for vm in self._vms.values():
+            vm.shutdown()