spec: gallery parity with the TypeScript examples

The same conversion table interscript-ts examples/ asserts - same
bytes from every runtime, demonstrated. Verified locally: 3/3 green.

Author: ronaldtse

spec/gallery_parity_spec.rb

@@ -0,0 +1,18 @@
+# Gallery parity: the same conversion table the TypeScript example
+# gallery (interscript-ts/examples/) asserts. Same bytes from every
+# runtime - demonstrated, not claimed. Adding a case = one line.
+
+require "interscript"
+GALLERY = {
+  "Антон Олегович" => "Anton Olehovych",
+  "Соломія" => "Solomiia",
+  "Київ" => "Kyiv",
+}.freeze
+
+RSpec.describe "gallery parity with the TypeScript examples" do
+  GALLERY.each do |input, expected|
+    it "bgnpcgn-ukr-Cyrl-Latn-2019: #{input} -> #{expected}" do
+      expect(Interscript.transliterate("bgnpcgn-ukr-Cyrl-Latn-2019", input)).to eq(expected)
+    end
+  end
+end