from django.conf import settings

# function that will pass a test.

def pass_test(*args): return

def no_backend(test_func, backend):

    "Use this decorator to disable test on specified backend."

    if settings.DATABASE_ENGINE == backend:

        return pass_test

    else:

        return test_func

# Decorators to disable entire test functions for specific

# spatial backends.

def no_oracle(func): return no_backend(func, 'oracle')

def no_postgis(func): return no_backend(func, 'postgresql_psycopg2')

def no_mysql(func): return no_backend(func, 'mysql')

# Shortcut booleans to omit only portions of tests.

oracle  = settings.DATABASE_ENGINE == 'oracle'

postgis = settings.DATABASE_ENGINE == 'postgresql_psycopg2' 

mysql   = settings.DATABASE_ENGINE == 'mysql'