1 files changed, 76 insertions, 0 deletions
diff --git a/spec/support/shared_examples/models/update_project_statistics_spec.rb b/spec/support/shared_examples/models/update_project_statistics_spec.rb
new file mode 100644
index 00000000000..7a04e940ee5
--- /dev/null
+++ b/spec/support/shared_examples/models/update_project_statistics_spec.rb
@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+shared_examples_for 'UpdateProjectStatistics' do
+  let(:project)   { subject.project }
+  let(:stat)      { described_class.statistic_name }
+  let(:attribute) { described_class.statistic_attribute }
+
+  def reload_stat
+    project.statistics.reload.send(stat).to_i
+  end
+
+  def read_attribute
+    subject.read_attribute(attribute).to_i
+  end
+
+  it { is_expected.to be_new_record }
+
+  context 'when creating' do
+    it 'updates the project statistics' do
+      delta = read_attribute
+
+      expect { subject.save! }
+        .to change { reload_stat }
+        .by(delta)
+    end
+  end
+
+  context 'when updating' do
+    before do
+      subject.save!
+    end
+
+    it 'updates project statistics' do
+      delta = 42
+
+      expect(ProjectStatistics)
+        .to receive(:increment_statistic)
+        .and_call_original
+
+      subject.write_attribute(attribute, read_attribute + delta)
+      expect { subject.save! }
+        .to change { reload_stat }
+        .by(delta)
+    end
+  end
+
+  context 'when destroying' do
+    before do
+      subject.save!
+    end
+
+    it 'updates the project statistics' do
+      delta = -read_attribute
+
+      expect(ProjectStatistics)
+        .to receive(:increment_statistic)
+        .and_call_original
+
+      expect { subject.destroy }
+        .to change { reload_stat }
+        .by(delta)
+    end
+
+    context 'when it is destroyed from the project level' do
+      it 'does not update the project statistics' do
+        expect(ProjectStatistics)
+          .not_to receive(:increment_statistic)
+
+        project.update(pending_delete: true)
+        project.destroy!
+      end
+    end
+  end
+end