testing.md

Testing hammer commands

Commands from hammer-cli-foreman are tested by two types of tests:

• unit tests - They're placed in test/unit and test only basic functionality of the commands like accepted options and field labels printed to stdout. Unit tests for commands are no longer extended.
• functional tests - They're placed in test/functional and aim to test commands in broader context. Functional tests require mocking the api calls and should also test output based on data returned from the api. This is preferable way of testing the commands.

Running the tests

bundle install
bundle exec rake test

Generated coverage reports are stored in ./coverage directory.

There is support for testing against API documentation generated from different versions of Foreman. The required version of Foreman can be set in env variable TEST_API_VERSION. Make sure the requested data are in test/unit/data/<version>/.

$ TEST_API_VERSION=1.13 bundle exec rake test

Testing API expectations

hammer-cli-foreman comes with a set of helpers and extensions to Mocha library for easier testing and better error detection.

The extensions are included in test/test_helper.rb by default. It's also possible to include it elswhere when needed:

require 'hammer_cli_foreman/testing/api_expectations'
include HammerCLIForeman::Testing::APIExpectations

Available helper functions

api_expects(resource=nil, action=nil, note=nil, &block)

• resource Symbol with plural name of the resource.
• action Symbol with action name.
• note String with description of the expected call to make its identification easier when the expectation fails.
• &block Optional block for testing parameters.

api_expects is often used together with with_params that set expectation on parameters that need to be included in the call:

describe 'hostgroup create' do
  it 'passes architecture id' do
    api_expects(:hostgroups, :create, 'Create hostgroup with architecture_id').with_params('hostgroup' => {
      'name' => 'hg1',
      'architecture_id' => 1
    })

    run_cmd(%w(hostgroup create --name hg1 --architecture-id 1))
  end
end

The expectation failure is reported with description of the call and expected parameters to make searching for mistakes easier:

unexpected invocation: #<AnyInstance:ApipieBindings::API>.call_action(<Action hostgroups:create>, {'hostgroup' => {'name' => 'hg1', 'architecture_id' => 2}}, {}, {:fake_response => nil})
unsatisfied expectations:
- expected exactly once, not yet invoked: Create hostgroup with architecture_id
  #<AnyInstance:ApipieBindings::API>.call_action(:hostgroups, :create, *any_argument)
  expected params to include: {
    "hostgroup": {
      "name": "hg1",
      "architecture_id": 1
    }
  }

Alternatively parameters can be tested in a block:

describe 'hostgroup create' do
  it 'passes architecture id' do
    api_expects(:hostgroups, :create, 'Create hostgroup with architecture_id') do |p|
      p['hostgroup']['architecture_id'] == 1 && p['hostgroup']['name'] == 'hg1'
    end

    run_cmd(%w(hostgroup create --name hg1 --architecture-id 1))
  end
end

This approach gives more freedom in what is tested and how but can't report what parameters were expected in case of failure.

api_expects_no_call

Makes sure no API call is performed.

Example:

describe 'hostgroup create' do
  it "doesn't perform any api request when name is missing" do
    api_expects_no_call
    run_cmd(%w(hostgroup create))
  end
end

api_expects_search(resource=nil, search_options={}, note=nil)

• resource Symbol with plural name of the resource.
• search_options Either hash with options to search by (eg. :name => 'x86_64') or a string with the search query.
• note String with description of the expected call to make its identification easier when the expectation fails.

Helper that sets expectation on searching for a resource when hammer translates from name of the resource to its id. It's often used together with returns that mocks result of the search query.

Example:

describe 'hostgroup create' do
  let(:arch) {{'id' => 1, 'name' => 'arch1'}}

  it 'resolves architecture name' do
    api_expects_search(:architectures, { :name => 'arch1' }).returns(index_response([arch]))
    run_cmd(%w(hostgroup create --name hg1 --architecture arch1))
  end
end

api_connection(options={}, version = '1.15')

• options Hash with options for the api connection.
• version Version of the Foreman apidoc. Available exported versions are located in subdirectories of test/data/.

The function returns instance of FakeApiConnection that makes #authenticator public and allows setting expectations on it. Useful for injection of api instances into tested objects.

APIExpectationsDecorator

Decorator class that adds helpers for setting expectations on the wrapped api instance. Provides methods expects_call, expects_no_call and expects_search that behave similarly to the helpers described above.

Example usage:

connection = api_connection
api = APIExpectationsDecorator.new(connection.api)
api.expects_search(:users, 'login=admin')