1 files changed, 155 insertions, 0 deletions
diff --git a/spec/lib/gitlab_settings/options_spec.rb b/spec/lib/gitlab_settings/options_spec.rb
new file mode 100644
index 00000000000..4b57e91c2e1
--- /dev/null
+++ b/spec/lib/gitlab_settings/options_spec.rb
@@ -0,0 +1,155 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSettings::Options, :aggregate_failures, feature_category: :shared do
+  let(:config) { { foo: { bar: 'baz' } } }
+
+  subject(:options) { described_class.build(config) }
+
+  describe '.build' do
+    context 'when argument is a hash' do
+      it 'creates a new GitlabSettings::Options instance' do
+        options = described_class.build(config)
+
+        expect(options).to be_a described_class
+        expect(options.foo).to be_a described_class
+        expect(options.foo.bar).to eq 'baz'
+      end
+    end
+  end
+
+  describe '#[]' do
+    it 'accesses the configuration key as string' do
+      expect(options['foo']).to be_a described_class
+      expect(options['foo']['bar']).to eq 'baz'
+
+      expect(options['inexistent']).to be_nil
+    end
+
+    it 'accesses the configuration key as symbol' do
+      expect(options[:foo]).to be_a described_class
+      expect(options[:foo][:bar]).to eq 'baz'
+
+      expect(options[:inexistent]).to be_nil
+    end
+  end
+
+  describe '#[]=' do
+    it 'changes the configuration key as string' do
+      options['foo']['bar'] = 'anothervalue'
+
+      expect(options['foo']['bar']).to eq 'anothervalue'
+    end
+
+    it 'changes the configuration key as symbol' do
+      options[:foo][:bar] = 'anothervalue'
+
+      expect(options[:foo][:bar]).to eq 'anothervalue'
+    end
+
+    context 'when key does not exist' do
+      it 'creates a new configuration by string key' do
+        options['inexistent'] = 'value'
+
+        expect(options['inexistent']).to eq 'value'
+      end
+
+      it 'creates a new configuration by string key' do
+        options[:inexistent] = 'value'
+
+        expect(options[:inexistent]).to eq 'value'
+      end
+    end
+  end
+
+  describe '#key?' do
+    it 'checks if a string key exists' do
+      expect(options.key?('foo')).to be true
+      expect(options.key?('inexistent')).to be false
+    end
+
+    it 'checks if a symbol key exists' do
+      expect(options.key?(:foo)).to be true
+      expect(options.key?(:inexistent)).to be false
+    end
+  end
+
+  describe '#to_hash' do
+    it 'returns the hash representation of the config' do
+      expect(options.to_hash).to eq('foo' => { 'bar' => 'baz' })
+    end
+  end
+
+  describe '#merge' do
+    it 'merges a hash to the existing options' do
+      expect(options.merge(more: 'configs').to_hash).to eq(
+        'foo' => { 'bar' => 'baz' },
+        'more' => 'configs'
+      )
+    end
+
+    context 'when the merge hash replaces existing configs' do
+      it 'merges a hash to the existing options' do
+        expect(options.merge(foo: 'configs').to_hash).to eq('foo' => 'configs')
+      end
+    end
+  end
+
+  describe '#deep_merge' do
+    it 'merges a hash to the existing options' do
+      expect(options.deep_merge(foo: { more: 'configs' }).to_hash).to eq('foo' => {
+        'bar' => 'baz',
+        'more' => 'configs'
+      })
+    end
+
+    context 'when the merge hash replaces existing configs' do
+      it 'merges a hash to the existing options' do
+        expect(options.deep_merge(foo: { bar: 'configs' }).to_hash).to eq('foo' => {
+          'bar' => 'configs'
+        })
+      end
+    end
+  end
+
+  describe '#is_a?' do
+    it 'returns false for anything different of Hash or GitlabSettings::Options' do
+      expect(options.is_a?(described_class)).to be true
+      expect(options.is_a?(Hash)).to be true
+      expect(options.is_a?(String)).to be false
+    end
+  end
+
+  describe '#method_missing' do
+    context 'when method is an option' do
+      it 'delegates methods to options keys' do
+        expect(options.foo.bar).to eq('baz')
+      end
+
+      it 'uses methods to change options values' do
+        expect { options.foo = 1 }
+          .to change { options.foo }
+          .to(1)
+      end
+    end
+
+    context 'when method is not an option' do
+      it 'delegates the method to the internal options hash' do
+        expect { options.foo.delete('bar') }
+          .to change { options.to_hash }
+          .to({ 'foo' => {} })
+      end
+    end
+
+    context 'when method is not an option and does not exist in hash' do
+      it 'raises GitlabSettings::MissingSetting' do
+        expect { options.anything }
+          .to raise_error(
+            ::GitlabSettings::MissingSetting,
+            "option 'anything' not defined"
+          )
+      end
+    end
+  end
+end