Add CI tests for MySQL database

.travis.yml

@@ -1,5 +1,9 @@
 dist: xenial
 
+services:
+    - mysql
+    - postgresql
+
 language: python
 python:
     - 3.6
@@ -16,11 +20,14 @@ before_install:
     - invoke install
     - invoke migrate
     - cd InvenTree && python3 manage.py createsuperuser --username InvenTreeAdmin --email admin@inventree.com --noinput && cd ..
+    - psql -c 'create database inventree_test_db;' -U postgres
+    - mysql -e `CREATE DATABSE inventree_test_db;'
 
 script:
     - cd InvenTree && python3 manage.py makemigrations && cd ..
     - python3 ci/check_migration_files.py
     - invoke coverage
+    - invoke test --database=mysql
     - invoke translate
     - invoke style
 

InvenTree/InvenTree/ci_mysql.py

@@ -0,0 +1,18 @@
+"""
+Configuration file for running tests against a MySQL database.
+"""
+
+from InvenTree.settings import *
+
+# Override the 'test' database
+if 'test' in sys.argv:
+    eprint('InvenTree: Running tests - Using MySQL test database')
+    
+    DATABASES['default'] = {
+        # Ensure mysql backend is being used
+        'ENGINE': 'django.db.backends.mysql',
+        'NAME': 'inventree_test_db',
+        'USER': 'travis',
+        'PASSWORD': '',
+        'HOST': '127.0.0.1'
+    }

tasks.py

@@ -174,18 +174,36 @@ def style(c):
     print("Running PEP style checks...")
     c.run('flake8 InvenTree')
 
-@task
+@task(help={'database': "Database framework to use (default=sqlite)"})
-def test(c):
+def test(c, database=None):
     """
     Run unit-tests for InvenTree codebase.
     """
 
+    if database is None:
+        database = 'sqlite'
+
+    database = database.lower()
+
+    allowed = {
+        'sqlite': 'InvenTree.settings',
+        'postgresql': 'InvenTree.ci_postgresql',
+        'mysql': 'InvenTree.ci_mysql',
+    }
+
+    if database not in allowed.keys():
+        print("Database framework not supported for testing:")
+        print("Choose from: '{a}'".format(a=allowed))
+
+        return False
+
     # Run sanity check on the django install
     manage(c, 'check')
 
     # Run coverage tests
-    manage(c, 'test {apps}'.format(
+    manage(c, 'test {apps} --settings={sett}'.format(
-        apps=' '.join(apps())
+        apps=' '.join(apps()),
+        sett=allowed[database]
     ))
 
 @task