Updated tests for TruffleRuby [skip ci]

Author: ankane

Gemfile

@@ -4,7 +4,7 @@ gemspec
 
 gem "rake"
 gem "minitest"
-gem "numo-narray", platform: :ruby
+gem "numo-narray", platforms: :mri
 gem "pg", platform: :ruby
 gem "jdbc-postgres", platform: :jruby
 gem "sequel"

test/pg_test.rb

@@ -2,7 +2,7 @@
 
 class PgTest < Minitest::Test
   def setup
-    skip if RUBY_PLATFORM == "java"
+    skip if RUBY_ENGINE == "jruby"
 
     conn.exec("DELETE FROM pg_items")
   end

test/sequel_test.rb

@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-adapter = RUBY_PLATFORM == "java" ? "jdbc:postgresql" : "postgres"
+adapter = RUBY_ENGINE == "jruby" ? "jdbc:postgresql" : "postgres"
 DB = Sequel.connect("#{adapter}://localhost/pgvector_ruby_test")
 
 if ENV["VERBOSE"]

test/vector_test.rb

@@ -12,7 +12,7 @@ def test_to_a
   end
 
   def test_numo
-    skip if RUBY_PLATFORM == "java"
+    skip if ["jruby", "truffleruby"].include?(RUBY_ENGINE)
 
     a = Pgvector::Vector.new([1, 2, 3])
     b = Pgvector::Vector.new(Numo::NArray.cast([1, 2, 3]))