add three basic test case for myql2 patch

test/minitest_helper.rb

@@ -398,3 +398,18 @@ def stub_for_mkmf_test
     end
   end
 end
+
+# For dbo patching test
+module Mysql2
+  class Client
+    attr_reader :query_options
+
+    def initialize(_opts = {})
+      @query_options = {}
+    end
+
+    def query(sql, _options = {})
+      sql
+    end
+  end
+end

test/patch/sw_mysql2_patch_in_span_test.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+# Copyright (c) 2023 SolarWinds, LLC.
+# All rights reserved.
+
+require 'minitest_helper'
+require './lib/solarwinds_apm/config'
+require './lib/solarwinds_apm/opentelemetry'
+require './lib/solarwinds_apm/support/txn_name_manager'
+require './lib/solarwinds_apm/otel_config'
+require './lib/solarwinds_apm/api'
+require './lib/solarwinds_apm/support/utils'
+
+describe 'mysql2 patch test' do
+  it 'mysql2_call_chain_include_patch' do
+    SolarWindsAPM::Config[:tag_sql] = true
+    SolarWindsAPM::OTelConfig.initialize
+
+    client_ancestors = Mysql2::Client.ancestors
+    _(client_ancestors[0]).must_equal OpenTelemetry::Instrumentation::Mysql2::Patches::Client
+    _(client_ancestors[1]).must_equal SolarWindsAPM::Patch::TagSql::SWOMysql2Patch
+    _(client_ancestors[2]).must_equal Mysql2::Client
+  end
+
+  describe 'tag_sql_mysql2_test_in_span' do
+    let(:sdk) { OpenTelemetry::SDK }
+    let(:exporter) { sdk::Trace::Export::InMemorySpanExporter.new }
+    let(:span_processor) { sdk::Trace::Export::SimpleSpanProcessor.new(exporter) }
+    let(:provider) do
+      OpenTelemetry.tracer_provider = sdk::Trace::TracerProvider.new.tap do |provider|
+        provider.add_span_processor(span_processor)
+      end
+    end
+    let(:tracer) { provider.tracer(__FILE__, sdk::VERSION) }
+    let(:parent_context) { OpenTelemetry::Context.empty }
+    let(:finished_spans) { exporter.finished_spans }
+
+    it 'mysql_patch_order_test_with_in_span' do
+      SolarWindsAPM::Config[:tag_sql] = true
+      SolarWindsAPM::OTelConfig.initialize
+
+      OpenTelemetry::Context.with_current(parent_context) do
+        tracer.in_span('root') do
+          mysql2_client = Mysql2::Client.new
+          sql = mysql2_client.query('SELECT * FROM ABC;')
+          pattern = %r{^SELECT \* FROM ABC;\s+/\*traceparent='[\da-f-]+'*\*/$}
+          assert_match pattern, sql, "Sql dones't contain traceparent"
+        end
+      end
+    end
+  end
+end

test/patch/sw_mysql2_patch_test.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Copyright (c) 2023 SolarWinds, LLC.
+# All rights reserved.
+
+require 'minitest_helper'
+require './lib/solarwinds_apm/config'
+require './lib/solarwinds_apm/opentelemetry'
+require './lib/solarwinds_apm/support/txn_name_manager'
+require './lib/solarwinds_apm/otel_config'
+
+describe 'mysql2 patch test' do
+  it 'mysql_patch_order_test_when_tag_sql_is_false' do
+    SolarWindsAPM::Config[:tag_sql] = false
+    SolarWindsAPM::OTelConfig.initialize
+
+    client_ancestors = Mysql2::Client.ancestors
+    _(client_ancestors[0]).must_equal OpenTelemetry::Instrumentation::Mysql2::Patches::Client
+    _(client_ancestors[1]).must_equal Mysql2::Client
+  end
+end