pytest-inmanta 0.7.1

A py.test plugin providing fixtures to simplify inmanta modules testing.

pytest-inmanta

A pytest plugin to test inmanta modules

Installation

pip install pytest-inmanta

Usage

This plugin provides a test fixture that can compile, export and deploy code without running an actual inmanta server.

def test_compile(project):
    """
        Test compiling a simple model that uses std
    """
    project.compile("""
host = std::Host(name="server", os=std::linux)
file = std::ConfigFile(host=host, path="/tmp/test", content="1234")
        """)

The fixture also provides access to the model internals

    assert len(project.get_instances("std::Host")) == 1
    assert project.get_instances("std::Host")[0].name == "server"

To the exported resources

    f = project.get_resource("std::ConfigFile")
    assert f.permissions == 644

To compiler output and mock filesystem

def test_template(project):
    """
        Test the evaluation of a template
    """
    project.add_mock_file("templates", "test.tmpl", "{{ value }}")
    project.compile("""import unittest
value = "1234"
std::print(std::template("unittest/test.tmpl"))
    """)

    assert project.get_stdout() == "1234\n"

And allows deploy

    project.deploy_resource("std::ConfigFile")

And dryrun

    changes = project.dryrun_resource("testmodule::Resource")
    assert changes == {"value": {'current': 'read', 'desired': 'write'}}

Testing plugins

Take the following plugin as an example:

    # <module-name>/plugins/__init__.py

    from inmanta.plugins import plugin

    @plugin
    def hostname(fqdn: "string") -> "string":
        """
            Return the hostname part of the fqdn
        """
        return fqdn.split(".")[0]

A test case, to test this plugin looks like this:

    # <module-name>/tests/test_hostname.py

    def test_hostname(project):
        host = "test"
        fqdn = f"{host}.something.com"
        assert project.get_plugin_function("hostname")(fqdn) == host

• Line 3: Creates a pytest test case, which requires the project fixture.
• Line 6: Calls the function project.get_plugin_function(plugin_name: str): FunctionType, which returns the plugin function named plugin_name. As such, this line tests whether host is returned when the plugin function hostname is called with the parameter fqdn.

Options

The following options are available.

• --venv: folder in which to place the virtual env for tests (will be shared by all tests), overrides INMANTA_TEST_ENV. This options depends on symlink support. This does not work on all windows versions. On windows 10 you need to run pytest in an admin shell.
• --module_repo: location to download modules from, overrides INMANTA_MODULE_REPO. The default value is the inmanta github organisation.

Use the generic pytest options --log-cli-level to show Inmanta logger to see any setup or cleanup warnings. For example, --log-cli-level=INFO