Add tests to custom search with matching_strategy param

spec/meilisearch/index/search/matching_strategy_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+RSpec.describe 'MeiliSearch::Index - Search with matching_strategy' do
+  include_context 'search books with nested fields'
+
+  it 'does a custom search with a matching strategy ALL' do
+    response = index.search('another french book', matching_strategy: 'all')
+
+    expect(response['hits'].count).to eq(1)
+  end
+
+  it 'does a custom search with a matching strategy LAST' do
+    response = index.search('french book', matching_strategy: 'last')
+
+    expect(response['hits'].count).to eq(2)
+  end
+end