testing.common.database 2.0.0

utilities for testing.* packages

About

testing.common.database is utilities for testing.* package.

Install

Use pip:

$ pip install testing.common.database

Helpers

class Database(object):

Database is a base class for database testing packages. To create your database testing class, inherit this class and override methods below.

def initialize(self):

Handler for initialize database object.

def get_data_directory(self):

Path to data directory of your databse.

Example:

def get_data_directory(self):
    return os.path.join(self.base_dir, 'data')

def initialize_database(self):

Handler to initialize your database.

Example:

def initialize_database(self):
   if not os.path.exists(os.path.join(self.base_dir, 'data', 'PG_VERSION')):
       args = ([self.initdb, '-D', os.path.join(self.base_dir, 'data'), '--lc-messages=C'] +
               self.settings['initdb_args'].split())

       try:
           p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
           output, err = p.communicate()
           if p.returncode != 0:
               raise RuntimeError("initdb failed: %r" % err)
       except OSError as exc:
           raise RuntimeError("failed to spawn initdb: %s" % exc)

def get_server_commandline(self):

Command line to invoke your database server.

Example:

def get_server_commandline(self):
    return (['postgres',
             '-p', str(self.settings['port']),
             '-D', os.path.join(self.base_dir, 'data'),
             '-k', os.path.join(self.base_dir, 'tmp')] +
            self.settings['postgres_args'].split())

def prestart(self):

Handler called before invoking your database server.

def poststart(self):

Hander called after invoking your database server.

def is_server_available(self):

Methods check your database server available. The Database class uses this method to check the server boots up.

Example:

try:
    with closing(pg8000.connect(**self.dsn(database='template1'))):
        pass
except pg8000.Error:
    return False
else:
    return True

def is_alive(self):

Methods check the database server is alive.

@property def server_pid(self):

Process ID of the database server.

class DatabaseFactory(object):

DatabaseFactory is a factory class for the database class. To create your database factory class, inherit this class and set target_class variable:

class PostgresqlFactory(DatabaseFactory):
    target_class = Postgresql

The factory class should work like a target_class:

# The factory class generates like a ``target_class``, in this case, generates ``Postgresql`` class
Postgresql = PostgresqlFactory()

# The generated class works same as ``target_class``
with Postgresql() as pgsql:
    #
    # do any tests using the database ...
    #

It can bypass parameters to the target_class on every instantiation:

Postgresql = PostgresqlFactory(copy_data_from='/path/to/database')

with Postgresql() as pgsql:
    #
    # Test with ``copy_data_from`` parameter :-)
    #

Also, it is able to cache the database generated at Database.initialize_database() with cache_initialized_db parameter. It avoids running database initialization on every tests:

# Initialize database once
Postgresql = PostgresqlFactory(cache_initialized_db=True)

with Postgresql() as pgsql:
    # copy cached database for this test.

If you want to fixtures to the database, use on_initialized parameter:

def handler(pgsql):
    # inserting fixtures

# Initialize database once, and call ``on_initialized`` handler
Postgresql = PostgresqlFactory(cache_initialized_db=True,
                               on_initialized=handler)

class SkipIfNotInstalledDecorator(object):

Generates decorator that skips the testcase if database command not found. To create decorator, inherit this class and set name variable and override search_server() method.

Example:

class PostgresqlSkipIfNotInstalledDecorator(SkipIfNotInstalledDecorator):
    name = 'PostgreSQL'

    def search_server(self):
        find_program('postgres', ['bin'])  # raise exception if not found


skipIfNotFound = skipIfNotInstalled = PostgresqlSkipIfNotInstalledDecorator()

@skipIfNotFound
def test():
    # testcase

def get_unused_port():

Get free TCP port.

def get_path_of(name):

Searchs command from search paths. It works like which command.

Requirements

• Python 2.6, 2.7, 3.2, 3.3, 3.4, 3.5

License

Apache License 2.0

History

2.0.0 (2016-08-20)

• Use subprocess.Popen() instead of fork & exec

• Support windows platform (experimental)

• #4: Add boot_timeout parameter

• Fix bugs:

  • Fix syntax errors for Python3

  • Show error messages if rescue from GC failed (ref: #1)

1.1.0 (2016-02-05)

• Add Database#server_pid to get pid of the database server

• Add Database#is_alive() to check server is alive

• Define BOOT_TIMEOUT as constant

• Fix AttributeError if any exceptions are raised in bootstrap

1.0.0 (2016-02-01)

• Initial release