Added test for Sequel

Gemfile

@@ -5,3 +5,4 @@ gemspec
 gem "rake"
 gem "minitest"
 gem "pg"
+gem "sequel"

test/sequel_test.rb

@@ -0,0 +1,27 @@
+require_relative "test_helper"
+
+DB = Sequel.connect("postgres://localhost/pgvector_ruby_test")
+
+DB.drop_table? :sequel_items
+DB.create_table :sequel_items do
+  primary_key :id
+  column :embedding, "vector(3)"
+end
+
+class TestSequel < Minitest::Test
+  def setup
+    items.delete
+  end
+
+  def test_works
+    items.insert(embedding: "[1,1,1]")
+    items.insert(embedding: "[2,2,2]")
+    items.insert(embedding: "[1,1,2]")
+    results = items.order(Sequel.lit("embedding <-> '[1,1,1]'")).limit(5).all
+    assert_equal [1, 3, 2], results.map { |r| r[:id] }
+  end
+
+  def items
+    DB[:sequel_items]
+  end
+end