diff --git a/test/pgvector_test.rb b/test/pgvector_test.rb
new file mode 100644
index 0000000..d45f6a6
--- /dev/null
+++ b/test/pgvector_test.rb
@@ -0,0 +1,27 @@
+require_relative "test_helper"
+
+class PgvectorTest < Minitest::Test
+  def test_encode_array
+    assert_equal "[1.0,2.0,3.0]", Pgvector.encode([1, 2, 3])
+  end
+
+  def test_encode_vector
+    assert_equal "[1.0,2.0,3.0]", Pgvector.encode(Pgvector::Vector.new([1, 2, 3]))
+  end
+
+  def test_encode_half_vector
+    assert_equal "[1.0,2.0,3.0]", Pgvector.encode(Pgvector::HalfVector.new([1, 2, 3]))
+  end
+
+  def test_encode_sparse_vector
+    assert_equal "{1:1.0,2:2.0,3:3.0}/3", Pgvector.encode(Pgvector::SparseVector.new([1, 2, 3]))
+  end
+
+  def test_decode_vector
+    assert_equal [1, 2, 3], Pgvector.decode("[1,2,3]")
+  end
+
+  def test_decode_sparse_vector
+    assert_equal [1, 2, 3], Pgvector.decode("{1:1.0,2:2.0,3:3.0}/3").to_a
+  end
+end