1 files changed, 81 insertions, 0 deletions
diff --git a/spec/lib/gitlab/analytics/usage_trends/workers_argument_builder_spec.rb b/spec/lib/gitlab/analytics/usage_trends/workers_argument_builder_spec.rb
new file mode 100644
index 00000000000..34c5bd6c6ae
--- /dev/null
+++ b/spec/lib/gitlab/analytics/usage_trends/workers_argument_builder_spec.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Analytics::UsageTrends::WorkersArgumentBuilder do
+  context 'when no measurement identifiers are given' do
+    it 'returns empty array' do
+      expect(described_class.new(measurement_identifiers: []).execute).to be_empty
+    end
+  end
+
+  context 'when measurement identifiers are given' do
+    let_it_be(:user_1) { create(:user) }
+    let_it_be(:project_1) { create(:project, namespace: user_1.namespace, creator: user_1) }
+    let_it_be(:project_2) { create(:project, namespace: user_1.namespace, creator: user_1) }
+    let_it_be(:project_3) { create(:project, namespace: user_1.namespace, creator: user_1) }
+
+    let(:recorded_at) { 2.days.ago }
+    let(:projects_measurement_identifier) { ::Analytics::UsageTrends::Measurement.identifiers.fetch(:projects) }
+    let(:users_measurement_identifier) { ::Analytics::UsageTrends::Measurement.identifiers.fetch(:users) }
+    let(:measurement_identifiers) { [projects_measurement_identifier, users_measurement_identifier] }
+
+    subject { described_class.new(measurement_identifiers: measurement_identifiers, recorded_at: recorded_at).execute }
+
+    it 'returns worker arguments' do
+      expect(subject).to eq([
+        [projects_measurement_identifier, project_1.id, project_3.id, recorded_at],
+        [users_measurement_identifier, user_1.id, user_1.id, recorded_at]
+      ])
+    end
+
+    context 'when bogus measurement identifiers are given' do
+      before do
+        measurement_identifiers << 'bogus1'
+        measurement_identifiers << 'bogus2'
+      end
+
+      it 'skips bogus measurement identifiers' do
+        expect(subject).to eq([
+          [projects_measurement_identifier, project_1.id, project_3.id, recorded_at],
+          [users_measurement_identifier, user_1.id, user_1.id, recorded_at]
+        ])
+      end
+    end
+
+    context 'when custom min and max queries are present' do
+      let(:min_id) { User.second.id }
+      let(:max_id) { User.maximum(:id) }
+      let(:users_measurement_identifier) { ::Analytics::UsageTrends::Measurement.identifiers.fetch(:users) }
+
+      before do
+        create_list(:user, 2)
+
+        min_max_queries = {
+          ::Analytics::UsageTrends::Measurement.identifiers[:users] => {
+            minimum_query: -> { min_id },
+            maximum_query: -> { max_id }
+          }
+        }
+
+        allow(::Analytics::UsageTrends::Measurement).to receive(:identifier_min_max_queries) { min_max_queries }
+      end
+
+      subject do
+        described_class.new(measurement_identifiers: [users_measurement_identifier], recorded_at: recorded_at)
+          .execute
+      end
+
+      it 'uses custom min/max for ids' do
+        expect(subject).to eq([
+                                [
+                                  users_measurement_identifier,
+                                  min_id,
+                                  max_id,
+                                  recorded_at
+                                ]
+                              ])
+      end
+    end
+  end
+end