Add Datateam Danger plugin

 - Move implementation into a danger plugin
 - Add tests

danger/datateam/Dangerfile

 # frozen_string_literal: true
 
-DATA_WAREHOUSE_LABELS = [
-  "Data Warehouse::Impact Check",
-  "Data Warehouse::Impacted",
-  "Data Warehouse::Not Impacted"
-].freeze
-
-FILE_PATH_REGEX = %r{((ee|jh)/)?config/metrics(/.+\.yml)}.freeze
-PERFORMANCE_INDICATOR_REGEX = %r{gmau|smau|paid_gmau|umau}.freeze
-
-CHANGED_SCHEMA_MESSAGE = <<~MSG
-Notification to the Data Team about changes to files with possible impact on Data Warehouse, add label `Data Warehouse::Impact Check`.
-
-/label ~"Data Warehouse::Impact Check"
-
-The following files require a review:
-
-MSG
-
-db_schema_updated = !git.modified_files.grep(%r{\Adb/structure\.sql}).empty?
-
-metrics_definitions_files = git.modified_files.grep(FILE_PATH_REGEX)
-
-data_warehouse_impact_files = metrics_definitions_files.select do |file|
-  helper.changed_lines(file).grep(PERFORMANCE_INDICATOR_REGEX).any?
-end.compact
-
-data_warehouse_impact_files << 'db/structure.sql' if db_schema_updated
-
-no_data_warehouse_labels = (gitlab.mr_labels & DATA_WAREHOUSE_LABELS).empty?
-
-markdown(CHANGED_SCHEMA_MESSAGE + helper.markdown_list(data_warehouse_impact_files)) if data_warehouse_impact_files.any? && no_data_warehouse_labels
+markdown(datateam.build_message) if datateam.impacted?

danger/plugins/datateam.rb

+# frozen_string_literal: true
+
+require_relative '../../tooling/danger/datateam'
+
+module Danger
+  class Datateam < ::Danger::Plugin
+    include Tooling::Danger::Datateam
+  end
+end

spec/tooling/danger/datateam_spec.rb

+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require 'gitlab-dangerfiles'
+require 'gitlab/dangerfiles/spec_helper'
+require 'pry'
+require_relative '../../../tooling/danger/datateam'
+
+RSpec.describe Tooling::Danger::Datateam do
+  include_context "with dangerfile"
+
+  let(:fake_danger) { DangerSpecHelper.fake_danger.include(described_class) }
+  let(:datateam) { fake_danger.new(helper: fake_helper) }
+
+  describe 'data team danger' do
+    using RSpec::Parameterized::TableSyntax
+
+    where do
+      {
+        'with structure.sql changes and no Data Warehouse::Impact Check label' => {
+          modified_files: %w(db/structure.sql app/models/user.rb),
+          changed_lines: ['+group_id bigint NOT NULL'],
+          mr_labels: [],
+          impacted: true,
+          impacted_files: %w(db/structure.sql)
+        },
+         'with structure.sql changes and Data Warehouse::Impact Check label' => {
+          modified_files: %w(db/structure.sql),
+          changed_lines: ['+group_id bigint NOT NULL)'],
+          mr_labels: ['Data Warehouse::Impact Check'],
+          impacted: false,
+          impacted_files: %w(db/structure.sql)
+        },
+        'with user model changes' => {
+          modified_files: %w(app/models/users.rb),
+          changed_lines: ['+has_one :namespace'],
+          mr_labels: [],
+          impacted: false,
+          impacted_files: []
+        },
+        'with perfomance indicator changes and no Data Warehouse::Impact Check label' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+          changed_lines: ['+-gmau'],
+          mr_labels: [],
+          impacted: true,
+          impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+        },
+        'with perfomance indicator changes and Data Warehouse::Impact Check label' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml),
+          changed_lines: ['+-gmau'],
+          mr_labels: ['Data Warehouse::Impact Check'],
+          impacted: false,
+          impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+        },
+        'with metric file changes and no performance indicator changes' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml),
+          changed_lines: ['-product_stage: growth'],
+          mr_labels: [],
+          impacted: false,
+          impacted_files: []
+        },
+        'with metric file changes and no performance indicator changes and other label' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml),
+          changed_lines: ['-product_stage: growth'],
+          mr_labels: ['type::tooling'],
+          impacted: false,
+          impacted_files: []
+        },
+        'with performance indicator changes and other label' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+          changed_lines: ['+-gmau'],
+          mr_labels: ['type::tooling'],
+          impacted: true,
+          impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+        },
+        'with performance indicator changes, Data Warehouse::Impact Check and other label' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+          changed_lines: ['+-gmau'],
+          mr_labels: ['type::tooling', 'Data Warehouse::Impact Check'],
+          impacted: false,
+          impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+        },
+        'with performance indicator changes and other labels' => {
+          modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+          changed_lines: ['+-gmau'],
+          mr_labels: ['type::tooling', 'Data Warehouse::Impacted'],
+          impacted: false,
+          impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+        }
+      }
+    end
+
+    with_them do
+      before do
+        allow(fake_helper).to receive(:modified_files).and_return(modified_files)
+        allow(fake_helper).to receive(:changed_lines).and_return(changed_lines)
+        allow(fake_helper).to receive(:mr_labels).and_return(mr_labels)
+        allow(fake_helper).to receive(:markdown_list).with(impacted_files).and_return(impacted_files.map { |item| "* `#{item}`" }.join("\n"))
+      end
+
+      it :aggregate_failures do
+        expect(datateam.impacted?).to be(impacted)
+        expect(datateam.build_message).to match_expected_message
+      end
+    end
+  end
+
+  def match_expected_message
+    return be_nil unless impacted
+
+    start_with(described_class::CHANGED_SCHEMA_MESSAGE).and(include(*impacted_files))
+  end
+end

spec/tooling/danger/project_helper_spec.rb

@@ -269,7 +269,7 @@ RSpec.describe Tooling::Danger::ProjectHelper do
 
   describe '.local_warning_message' do
     it 'returns an informational message with rules that can run' do
-      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, ci_config, database, documentation, duplicate_yarn_dependencies, eslint, gitaly, pajamas, pipeline, prettier, product_intelligence, utility_css, vue_shared_documentation')
+      expect(described_class.local_warning_message).to eq('==> Only the following Danger rules can be run locally: changelog, ci_config, database, documentation, duplicate_yarn_dependencies, eslint, gitaly, pajamas, pipeline, prettier, product_intelligence, utility_css, vue_shared_documentation, datateam')
     end
   end
 

tooling/danger/datateam.rb

+# frozen_string_literal: true
+
+module Tooling
+  module Danger
+    module Datateam
+      CHANGED_SCHEMA_MESSAGE = <<~MSG
+        Notification to the Data Team about changes to files with possible impact on Data Warehouse, add label `Data Warehouse::Impact Check`.
+
+        /label ~"Data Warehouse::Impact Check"
+
+        The following files require a review:
+
+      MSG
+
+      DATA_WAREHOUSE_SCOPE = 'Data Warehouse::'
+      FILE_PATH_REGEX = %r{((ee|jh)/)?config/metrics(/.+\.yml)}.freeze
+      PERFORMANCE_INDICATOR_REGEX = %r{gmau|smau|paid_gmau|umau}.freeze
+      DATABASE_REGEX = %r{\Adb/structure\.sql}.freeze
+      STRUCTURE_SQL_FILE = %w(db/structure.sql).freeze
+
+      def build_message
+        return unless impacted?
+
+        CHANGED_SCHEMA_MESSAGE + helper.markdown_list(data_warehouse_impact_files)
+      end
+
+      def impacted?
+        !labelled_as_datawarehouse? && data_warehouse_impact_files.any?
+      end
+
+      private
+
+      def data_warehouse_impact_files
+        @impacted_files ||= (performance_indicator_changed_files + database_changed_files)
+      end
+
+      def labelled_as_datawarehouse?
+        helper.mr_labels.any? { |label| label.start_with?(DATA_WAREHOUSE_SCOPE) }
+      end
+
+      def performance_indicator_changed_files
+        metrics_definitions_files = helper.modified_files.grep(FILE_PATH_REGEX)
+
+        metrics_definitions_files.select do |file|
+          helper.changed_lines(file).any? { |change| change =~ PERFORMANCE_INDICATOR_REGEX }
+        end.compact
+      end
+
+      def database_changes?
+        !helper.modified_files.grep(DATABASE_REGEX).empty?
+      end
+
+      def database_changed_files
+        helper.modified_files & STRUCTURE_SQL_FILE
+      end
+    end
+  end
+end

tooling/danger/project_helper.rb

@@ -17,6 +17,7 @@ module Tooling
         product_intelligence
         utility_css
         vue_shared_documentation
+        datateam
       ].freeze
 
       CI_ONLY_RULES ||= %w[