1 files changed, 66 insertions, 0 deletions
diff --git a/gems/click_house-client/spec/click_house/client/configuration_spec.rb b/gems/click_house-client/spec/click_house/client/configuration_spec.rb
new file mode 100644
index 00000000000..8cbd64ca650
--- /dev/null
+++ b/gems/click_house-client/spec/click_house/client/configuration_spec.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ClickHouse::Client::Configuration do
+  subject(:configuration) do
+    config = described_class.new
+    config.http_post_proc = -> {}
+    config.json_parser = Object
+    config
+  end
+
+  describe '#register_database' do
+    let(:database_options) do
+      {
+        database: 'test_db',
+        url: 'http://localhost:3333',
+        username: 'user',
+        password: 'pass',
+        variables: {
+          join_use_nulls: 1
+        }
+      }
+    end
+
+    it 'registers a database' do
+      configuration.register_database(:my_db, **database_options)
+
+      expect(configuration.databases.size).to eq(1)
+      database = configuration.databases[:my_db]
+
+      expect(database.uri.to_s).to eq('http://localhost:3333?database=test_db&join_use_nulls=1')
+    end
+
+    context 'when adding the same DB multiple times' do
+      it 'raises error' do
+        configuration.register_database(:my_db, **database_options)
+        expect do
+          configuration.register_database(:my_db, **database_options)
+        end.to raise_error(ClickHouse::Client::ConfigurationError, /database 'my_db' is already registered/)
+      end
+    end
+  end
+
+  describe '#validate!' do
+    context 'when `http_post_proc` option is not configured' do
+      it 'raises error' do
+        configuration.http_post_proc = nil
+
+        expect do
+          configuration.validate!
+        end.to raise_error(ClickHouse::Client::ConfigurationError, /'http_post_proc' option is not configured/)
+      end
+    end
+
+    context 'when `json_parser` option is not configured' do
+      it 'raises error' do
+        configuration.json_parser = nil
+
+        expect do
+          configuration.validate!
+        end.to raise_error(ClickHouse::Client::ConfigurationError, /'json_parser' option is not configured/)
+      end
+    end
+  end
+end