Module: GovukAbTesting::MinitestHelpers

Defined in:
lib/govuk_ab_testing/minitest_helpers.rb

Instance Method Summary collapse

Instance Method Details

#assert_response_not_modified_for_ab_test ⇒ Object 



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# File 'lib/govuk_ab_testing/minitest_helpers.rb', line 54

def assert_response_not_modified_for_ab_test
  assert_nil response.headers['Vary'],
    "`Vary` header is being added to a page which is outside of the A/B test"

  assert_select "meta[name='govuk:ab-test']", false
end

#setup_ab_variant(ab_test_name, variant, dimension = 300) ⇒ Object 



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# File 'lib/govuk_ab_testing/minitest_helpers.rb', line 48

def setup_ab_variant(ab_test_name, variant, dimension = 300)
  ab_test = GovukAbTesting::AbTest.new(ab_test_name, dimension: dimension)

  @request.headers[ab_test.request_header] = variant
end

#with_variant(args) ⇒ Object 



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# File 'lib/govuk_ab_testing/minitest_helpers.rb', line 3

def with_variant(args)
  ab_test_name, variant = args.first
  dimension = args[:dimension]

  ab_test =
    GovukAbTesting::AbTest.new(ab_test_name.to_s, dimension: dimension)

  @request.headers[ab_test.request_header] = variant
  requested_variant = ab_test.requested_variant(@request)

  yield

  assert_match ab_test.response_header, response.headers['Vary'],
    "You probably forgot to use `configure_response`"

  unless args[:assert_meta_tag] == false
    expected_content =
      ab_test.meta_tag_name + ':' + requested_variant.variant_name
    message = "You probably forgot to add the `analytics_meta_tag` to the views"
    meta_tags = css_select("meta[name='govuk:ab-test']")

    assert_equal(1, meta_tags.count, message)

    meta_tag = meta_tags.first
    content_value = meta_tag.attributes['content'].value
    dimension_value = meta_tag.attributes['data-analytics-dimension'].value

    assert_equal(
      expected_content,
      content_value,
      "Meta tag's content doesn't match."
    )

    if dimension.nil?
      assert(dimension_value, "No custom dimension number found")
    else
      assert_equal(
        dimension.to_s,
        dimension_value,
        "The custom dimension found in meta tag doesn't match"
      )
    end
  end
end