Integration Tests¶

The Salt integration tests come with a number of classes and methods which allow for components to be easily tested. These classes are generally inherited from and provide specific methods for hooking into the running integration test environment created by the integration tests.

It is noteworthy that since integration tests validate against a running environment that they are generally the preferred means to write tests.

The integration system is all located under tests/integration in the Salt source tree. Each directory within tests/integration corresponds to a directory in Salt's tree structure. For example, the integration tests for the test.py Salt module that is located in salt/modules should also be named test.py and reside in tests/integration/modules.

Adding New Directories¶

If the corresponding Salt directory does not exist within tests/integration, the new directory must be created along with the appropriate test file to maintain Salt's testing directory structure.

In order for Salt's test suite to recognize tests within the newly created directory, options to run the new integration tests must be added to tests/runtests.py. Examples of the necessary options that must be added can be found here: https://github.com/saltstack/salt/blob/develop/tests/runtests.py. The functions that need to be edited are setup_additional_options, validate_options, and run_integration_tests.

Integration Classes¶

The integration classes are located in tests/integration/__init__.py and can be extended therein. There are three classes available to extend:

ModuleCase¶

Used to define executions run via the master to minions and to call single modules and states.

The available methods are as follows:

run_function:: Run a single salt function and condition the return down to match the behavior of the raw function call. This will run the command and only return the results from a single minion to verify.
state_result:: Return the result data from a single state return
run_state:: Run the state.single command and return the state return structure

SyndicCase¶

Used to execute remote commands via a syndic, only used to verify the capabilities of the Syndic.

The available methods are as follows:

run_function:: Run a single salt function and condition the return down to match the behavior of the raw function call. This will run the command and only return the results from a single minion to verify.

ShellCase¶

Shell out to the scripts which ship with Salt.

The available methods are as follows:

run_script:: Execute a salt script with the given argument string
run_salt:: Execute the salt command, pass in the argument string as it would be passed on the command line.
run_run:: Execute the salt-run command, pass in the argument string as it would be passed on the command line.
run_run_plus:: Execute Salt run and the salt run function and return the data from each in a dict
run_key:: Execute the salt-key command, pass in the argument string as it would be passed on the command line.
run_cp:: Execute salt-cp, pass in the argument string as it would be passed on the command line.
run_call:: Execute salt-call, pass in the argument string as it would be passed on the command line.

Examples¶

Module Example via ModuleCase Class¶

Import the integration module, this module is already added to the python path by the test execution. Inherit from the integration.ModuleCase class.

Now the workhorse method run_function can be used to test a module:

import os
import integration


class TestModuleTest(integration.ModuleCase):
    '''
    Validate the test module
    '''
    def test_ping(self):
        '''
        test.ping
        '''
        self.assertTrue(self.run_function('test.ping'))

    def test_echo(self):
        '''
        test.echo
        '''
        self.assertEqual(self.run_function('test.echo', ['text']), 'text')

Shell Example via ShellCase¶

Validating the shell commands can be done via shell tests:

import sys
import shutil
import tempfile

import integration

class KeyTest(integration.ShellCase):
    '''
    Test salt-key script
    '''

    _call_binary_ = 'salt-key'

    def test_list(self):
        '''
        test salt-key -L
        '''
        data = self.run_key('-L')
        expect = [
                'Unaccepted Keys:',
                'Accepted Keys:',
                'minion',
                'sub_minion',
                'Rejected:', '']
        self.assertEqual(data, expect)

This example verifies that the salt-key command executes and returns as expected by making use of the run_key method.

Integration Test Files¶

Since using Salt largely involves configuring states, editing files, and changing system data, the integration test suite contains a directory named files to aid in testing functions that require files. Various Salt integration tests use these example files to test against instead of altering system files and data.

Each directory within tests/integration/files contain files that accomplish different tasks, based on the needs of the integration tests using those files. For example, tests/integration/files/ssh is used to bootstrap the test runner for salt-ssh testing, while tests/integration/files/pillar contains files storing data needed to test various pillar functions.

The tests/integration/files directory also includes an integration state tree. The integration state tree can be found at tests/integration/files/file/base.

The following example demonstrates how integration files can be used with ModuleCase to test states:

import os
import shutil
import integration

HFILE = os.path.join(integration.TMP, 'hosts')

class HostTest(integration.ModuleCase):
    '''
    Validate the host state
    '''

    def setUp(self):
        shutil.copyfile(os.path.join(integration.FILES, 'hosts'), HFILE)
        super(HostTest, self).setUp()

    def tearDown(self):
        if os.path.exists(HFILE):
            os.remove(HFILE)
        super(HostTest, self).tearDown()

    def test_present(self):
        '''
        host.present
        '''
        name = 'spam.bacon'
        ip = '10.10.10.10'
        ret = self.run_state('host.present', name=name, ip=ip)
        result = self.state_result(ret)
        self.assertTrue(result)
        with open(HFILE) as fp_:
            output = fp_.read()
            self.assertIn('{0}\t\t{1}'.format(ip, name), output)

To access the integration files, a variable named integration.FILES points to the tests/integration/files directory. This is where the referenced host.present sls file resides.

In addition to the static files in the integration state tree, the location integration.TMP can also be used to store temporary files that the test system will clean up when the execution finishes.

Destructive vs Non-Destructive Tests¶

Since Salt is used to change the settings and behavior of systems, one testing approach is to run tests that make actual changes to the underlying system. This is where the concept of destructive integration tests comes into play. Tests can be written to alter the system they are running on. This capability is what fills in the gap needed to properly test aspects of system management like package installation.

Any test that changes the underlying system in any way, such as creating or deleting users, installing packages, or changing permissions should include the @destructive decorator to signal system changes and should be written with care. System changes executed within a destructive test should also be restored once the related tests have completed. For example, if a new user is created to test a module, the same user should be removed after the test is completed to maintain system integrity.

To write a destructive test, import, and use the destructiveTest decorator for the test method:

import integration
from salttesting.helpers import destructiveTest

class DestructiveExampleModuleTest(integration.ModuleCase):
    '''
    Demonstrate a destructive test
    '''

    @destructiveTest
    @skipIf(os.geteuid() != 0, 'you must be root to run this test')
    def test_user_not_present(self):
        '''
        This is a DESTRUCTIVE TEST it creates a new user on the minion.
        And then destroys that user.
        '''
        ret = self.run_state('user.present', name='salt_test')
        self.assertSaltTrueReturn(ret)
        ret = self.run_state('user.absent', name='salt_test')
        self.assertSaltTrueReturn(ret)

Cloud Provider Tests¶

Cloud provider integration tests are used to assess Salt-Cloud's ability to create and destroy cloud instances for various supported cloud providers. Cloud provider tests inherit from the ShellCase Integration Class.

Any new cloud provider test files should be added to the tests/integration/cloud/providers/ directory. Each cloud provider test file also requires a sample cloud profile and cloud provider configuration file in the integration test file directory located at tests/integration/files/conf/cloud.*.d/.

The following is an example of the default profile configuration file for Digital Ocean, located at: tests/integration/files/conf/cloud.profiles.d/digital_ocean.conf:

digitalocean-test:
  provider: digitalocean-config
  image: Ubuntu 14.04 x64
  size: 512MB

Each cloud provider requires different configuration credentials. Therefore, sensitive information such as API keys or passwords should be omitted from the cloud provider configuration file and replaced with an empty string. The necessary credentials can be provided by the user by editing the provider configuration file before running the tests.

The following is an example of the default provider configuration file for Digital Ocean, located at: tests/integration/files/conf/cloud.providers.d/digital_ocean.conf:

digitalocean-config:
  provider: digital_ocean
  client_key: ''
  api_key: ''
  location: New York 1

In addition to providing the necessary cloud profile and provider files in the integration test suite file structure, appropriate checks for if the configuration files exist and contain valid information are also required in the test class's setUp function:

class LinodeTest(integration.ShellCase):
'''
Integration tests for the Linode cloud provider in Salt-Cloud
'''

def setUp(self):
    '''
    Sets up the test requirements
    '''
    super(LinodeTest, self).setUp()

    # check if appropriate cloud provider and profile files are present
    profile_str = 'linode-config:'
    provider = 'linode'
    providers = self.run_cloud('--list-providers')
    if profile_str not in providers:
        self.skipTest(
            'Configuration file for {0} was not found. Check {0}.conf files '
            'in tests/integration/files/conf/cloud.*.d/ to run these tests.'
            .format(provider)
        )

    # check if apikey and password are present
    path = os.path.join(integration.FILES,
                        'conf',
                        'cloud.providers.d',
                        provider + '.conf')
    config = cloud_providers_config(path)
    api = config['linode-config']['linode']['apikey']
    password = config['linode-config']['linode']['password']
    if api == '' or password == '':
        self.skipTest(
            'An api key and password must be provided to run these tests. Check '
            'tests/integration/files/conf/cloud.providers.d/{0}.conf'.format(
                provider
            )
        )

Repeatedly creating and destroying instances on cloud providers can be costly. Therefore, cloud provider tests are off by default and do not run automatically. To run the cloud provider tests, the --cloud-provider-tests flag must be provided:

./tests/runtests.py --cloud-provider-tests

Since cloud provider tests do not run automatically, all provider tests must be preceded with the @expensiveTest decorator. The expensive test decorator is necessary because it signals to the test suite that the --cloud-provider-tests flag is required to run the cloud provider tests.

To write a cloud provider test, import, and use the expensiveTest decorator for the test function:

from salttesting.helpers import expensiveTest

@expensiveTest
def test_instance(self):
    '''
    Test creating an instance on Linode
    '''
    name = 'linode-testing'

    # create the instance
    instance = self.run_cloud('-p linode-test {0}'.format(name))
    str = '        {0}'.format(name)

    # check if instance with salt installed returned as expected
    try:
        self.assertIn(str, instance)
    except AssertionError:
        self.run_cloud('-d {0} --assume-yes'.format(name))
        raise

    # delete the instance
    delete = self.run_cloud('-d {0} --assume-yes'.format(name))
    str = '            True'
    try:
        self.assertIn(str, delete)
    except AssertionError:
        raise