diff --git a/test/many_data/test_snapshots.rb b/test/many_data/test_snapshots.rb
index f88abcd7..04b1c28d 100644
--- a/test/many_data/test_snapshots.rb
+++ b/test/many_data/test_snapshots.rb
@@ -7,34 +7,44 @@
 
 # https://github.com/kachick/ruby-ulid/issues/89
 class TestSnapshots < Test::Unit::TestCase
-  Example = Data.define(:integer, :timestamp, :randomness, :to_time, :inspect, :uuidish, :uuidv4, :octets)
-
   toml = PerfectTOML.load_file("#{__dir__}/fixtures/snapshots_2024-01-10_07-59.toml", symbolize_names: true)
   EXAMPLES = toml.to_h do |id, table|
     encoded = id.id2name
-    [encoded, [encoded, Example.new(**table)]]
+    [encoded, [encoded, table]]
   end
   raise 'looks like misloading' unless EXAMPLES.size > 1000
 
   def assert_example(ulid, example)
-    assert_equal(example.integer, ulid.to_i)
-    assert_equal(example.inspect, ulid.inspect)
-    assert_equal(example.timestamp, ulid.timestamp)
-    assert_equal(example.randomness, ulid.randomness)
-    assert_equal(example.uuidish, ulid.to_uuidish)
-    assert_equal(example.uuidv4, ulid.to_uuidv4(force: true))
-    assert_equal(example.to_time, ulid.to_time)
-    assert_equal(example.octets, ulid.octets)
+    case example
+    in { integer:, timestamp:, randomness:, to_time:, inspect:, uuidish:, uuidv4:, octets: }
+      assert_equal(integer, ulid.to_i)
+      assert_equal(inspect, ulid.inspect)
+      assert_equal(timestamp, ulid.timestamp)
+      assert_equal(randomness, ulid.randomness)
+      assert_equal(uuidish, ulid.to_uuidish)
+      assert_equal(uuidv4, ulid.to_uuidv4(force: true))
+      assert_equal(to_time, ulid.to_time)
+      assert_equal(octets, ulid.octets)
+    else
+      raise(ArgumentError, 'given example is unknown format')
+    end
   end
 
   data(EXAMPLES)
   def test_decoders(ee)
     encoded, example = *ee
     ulid_parsed = ULID.parse(encoded)
-    ulid_from_integer = ULID.from_integer(example.integer)
-    ulid_from_uuidv4 = ULID.from_uuidish(ulid_parsed.to_uuidish)
+
+    case example
+    in { integer:, uuidish: }
+      ulid_from_integer = ULID.from_integer(integer)
+      ulid_from_uuidish = ULID.from_uuidish(uuidish)
+    else
+      raise(ArgumentError, 'given example is unknown format')
+    end
+
     assert_equal(ulid_parsed, ulid_from_integer)
-    assert_equal(ulid_parsed, ulid_from_uuidv4)
+    assert_equal(ulid_parsed, ulid_from_uuidish)
 
     assert_equal(encoded, ulid_parsed.to_s)
     assert do