1 files changed, 159 insertions, 13 deletions
diff --git a/spec/initializers/00_deprecations_spec.rb b/spec/initializers/00_deprecations_spec.rb
index e52e64415af..a12d079082b 100644
--- a/spec/initializers/00_deprecations_spec.rb
+++ b/spec/initializers/00_deprecations_spec.rb
@@ -2,19 +2,165 @@
 
 require 'spec_helper'
 
-RSpec.describe '00_deprecations' do
-  where(:warning) do
-    [
-      "ActiveModel::Errors#keys is deprecated and will be removed in Rails 6.2",
-      "Rendering actions with '.' in the name is deprecated:",
-      "default_hash is deprecated and will be removed from Rails 6.2"
-    ]
-  end
-
-  with_them do
-    specify do
-      expect { ActiveSupport::Deprecation.warn(warning) }
-        .to raise_error(ActiveSupport::DeprecationException)
+RSpec.describe '00_deprecations', feature_category: :shared do
+  def setup_other_deprecations
+    Warning.process(__FILE__) { :default }
+  end
+
+  def load_initializer
+    load Rails.root.join('config/initializers/00_deprecations.rb')
+  end
+
+  let(:rails_env) { nil }
+  let(:gitlab_log_deprecations) { nil }
+
+  before do
+    stub_rails_env(rails_env) if rails_env
+    stub_env('GITLAB_LOG_DEPRECATIONS', gitlab_log_deprecations)
+
+    setup_other_deprecations
+
+    ActiveSupport::Deprecation.disallowed_warnings = nil
+    ActiveSupport::Notifications.unsubscribe('deprecation.rails')
+
+    load_initializer
+  end
+
+  around do |example|
+    Warning.clear(&example)
+  end
+
+  shared_examples 'logs to Gitlab::DeprecationJsonLogger' do |message, source|
+    it 'logs them to Gitlab::DeprecationJsonLogger' do
+      expect(Gitlab::DeprecationJsonLogger).to receive(:info).with(
+        message: match(/^#{message}/),
+        source: source
+      )
+
+      subject
+    end
+  end
+
+  shared_examples 'does not log to Gitlab::DeprecationJsonLogger' do
+    it 'does not log them to Gitlab::DeprecationJsonLogger' do
+      expect(Gitlab::DeprecationJsonLogger).not_to receive(:info)
+
+      subject
+    end
+  end
+
+  shared_examples 'logs to stderr' do |message|
+    it 'logs them to stderr' do
+      expect { subject }.to output(match(/^#{message}/)).to_stderr
+    end
+  end
+
+  shared_examples 'does not log to stderr' do
+    it 'does not log them to stderr' do
+      expect { subject }.not_to output.to_stderr
+    end
+  end
+
+  describe 'Ruby deprecations' do
+    context 'when catching deprecations through Kernel#warn' do
+      subject { warn('ABC gem is deprecated and will be removed') }
+
+      include_examples 'logs to Gitlab::DeprecationJsonLogger', 'ABC gem is deprecated and will be removed', 'ruby'
+      include_examples 'logs to stderr', 'ABC gem is deprecated and will be removed'
+
+      context 'when in production environment' do
+        let(:rails_env) { 'production' }
+
+        include_examples 'does not log to Gitlab::DeprecationJsonLogger'
+        include_examples 'logs to stderr', 'ABC gem is deprecated and will be removed'
+
+        context 'when GITLAB_LOG_DEPRECATIONS is set' do
+          let(:gitlab_log_deprecations) { '1' }
+
+          include_examples 'logs to Gitlab::DeprecationJsonLogger', 'ABC gem is deprecated and will be removed', 'ruby'
+          include_examples 'logs to stderr', 'ABC gem is deprecated and will be removed'
+        end
+      end
+    end
+
+    context 'when other messages from Kernel#warn' do
+      subject { warn('Sure is hot today') }
+
+      include_examples 'does not log to Gitlab::DeprecationJsonLogger'
+      include_examples 'logs to stderr', 'Sure is hot today'
+    end
+  end
+
+  describe 'Rails deprecations' do
+    context 'when catching deprecation warnings' do
+      subject { ActiveSupport::Deprecation.warn('ABC will be removed') }
+
+      include_examples 'logs to Gitlab::DeprecationJsonLogger', 'DEPRECATION WARNING: ABC will be removed', 'rails'
+      include_examples 'logs to stderr', 'DEPRECATION WARNING: ABC will be removed'
+
+      context 'when in production environment' do
+        let(:rails_env) { 'production' }
+
+        include_examples 'does not log to Gitlab::DeprecationJsonLogger'
+        include_examples 'does not log to stderr'
+
+        context 'when GITLAB_LOG_DEPRECATIONS is set' do
+          let(:gitlab_log_deprecations) { '1' }
+
+          include_examples 'logs to Gitlab::DeprecationJsonLogger', 'DEPRECATION WARNING: ABC will be removed', 'rails'
+          include_examples 'does not log to stderr'
+        end
+      end
+    end
+
+    context 'when catching disallowed warnings' do
+      before do
+        ActiveSupport::Deprecation.disallowed_warnings << /disallowed warning 1/
+      end
+
+      subject { ActiveSupport::Deprecation.warn('This is disallowed warning 1.') }
+
+      it 'raises ActiveSupport::DeprecationException' do
+        expect { subject }.to raise_error(ActiveSupport::DeprecationException)
+      end
+
+      context 'when in production environment' do
+        let(:rails_env) { 'production' }
+
+        it 'does not raise ActiveSupport::DeprecationException' do
+          expect { subject }.not_to raise_error
+        end
+
+        context 'when GITLAB_LOG_DEPRECATIONS is set' do
+          let(:gitlab_log_deprecations) { '1' }
+
+          it 'does not raise ActiveSupport::DeprecationException' do
+            expect { subject }.not_to raise_error
+          end
+        end
+      end
+    end
+
+    describe 'configuring ActiveSupport::Deprecation.disallowed_warnings' do
+      it 'sets disallowed warnings' do
+        expect(ActiveSupport::Deprecation.disallowed_warnings).not_to be_empty
+      end
+
+      context 'when in production environment' do
+        let(:rails_env) { 'production' }
+
+        it 'does not set disallowed warnings' do
+          expect(ActiveSupport::Deprecation.disallowed_warnings).to be_empty
+        end
+
+        context 'when GITLAB_LOG_DEPRECATIONS is set' do
+          let(:gitlab_log_deprecations) { '1' }
+
+          it 'does not set disallowed warnings' do
+            expect(ActiveSupport::Deprecation.disallowed_warnings).to be_empty
+          end
+        end
+      end
     end
   end
 end