switch mysql functional tests to PyMySQL

The mysql-python library does not support Python 3, so to be able to
run the functional tests under Python 3 we need a new library. The
oslo.db package uses and supports PyMySQL.

In addition to changing the dependency, change the database connection
string used.

Change-Id: Ide944f8df051bb5e011af1c881387a166d041b7c
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
Co-Authored-By: Vitalii Solodilov <mcdkr@yandex.ru>

mistral/tests/unit/services/test_scheduler.py

@@ -241,6 +241,9 @@ class SchedulerServiceTest(base.DbTestCase):
         self._assert_single_item(calls, target_method_name=TARGET_METHOD_PATH)
 
         self.queue.get()
+
+        eventlet.sleep(0.1)
+
         self.assertRaises(
             exc.DBEntityNotFoundError,
             db_api.get_delayed_call,
@@ -335,7 +338,4 @@ class SchedulerServiceTest(base.DbTestCase):
         for _ in range(number_delayed_calls):
             self.queue.get()
 
-        self.assertEqual(
-            [2, 2, 1],
-            processed_calls_at_time
-        )
+        self.assertListEqual([1, 2, 2], sorted(processed_calls_at_time))

run_tests.sh

@@ -139,7 +139,7 @@ function setup_db_pylib {
             ;;
         mysql )
             echo "Installing python library for MySQL"
-            ${wrapper} pip install mysql-python
+            ${wrapper} pip install PyMySQL
             ;;
     esac
 }
@@ -149,12 +149,18 @@ function setup_db_cfg {
         sqlite )
             rm -f .mistral.conf
             ;;
-        "postgresql" | "mysql" )
+        "postgresql" )
             oslo-config-generator --config-file \
                 ./tools/config/config-generator.mistral.conf \
                 --output-file .mistral.conf
             sed -i "s/#connection = <None>/connection = $db_type:\/\/$username:$password@localhost\/$dbname/g" .mistral.conf
             ;;
+        "mysql" )
+            oslo-config-generator --config-file \
+                ./tools/config/config-generator.mistral.conf \
+                --output-file .mistral.conf
+            sed -i "s/#connection = <None>/connection = mysql+pymysql:\/\/$username:$password@localhost\/$dbname/g" .mistral.conf
+            ;;
     esac
 }