1 files changed, 85 insertions, 0 deletions
diff --git a/test/prism/ripper_test.rb b/test/prism/ripper_test.rb
new file mode 100644
index 0000000000..07238fc3d5
--- /dev/null
+++ b/test/prism/ripper_test.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+return if RUBY_VERSION < "3.3"
+
+require_relative "test_helper"
+
+module Prism
+  class RipperTest < TestCase
+    base = File.join(__dir__, "fixtures")
+    relatives = ENV["FOCUS"] ? [ENV["FOCUS"]] : Dir["**/*.txt", base: base]
+
+    incorrect = [
+      # Ripper incorrectly attributes the block to the keyword.
+      "seattlerb/block_break.txt",
+      "seattlerb/block_next.txt",
+      "seattlerb/block_return.txt",
+      "whitequark/break_block.txt",
+      "whitequark/next_block.txt",
+      "whitequark/return_block.txt",
+
+      # Ripper is not accounting for locals created by patterns using the **
+      # operator within an `in` clause.
+      "seattlerb/parse_pattern_058.txt",
+
+      # Ripper cannot handle named capture groups in regular expressions.
+      "regex.txt",
+      "regex_char_width.txt",
+      "whitequark/lvar_injecting_match.txt",
+
+      # Ripper fails to understand some structures that span across heredocs.
+      "spanning_heredoc.txt"
+    ]
+
+    omitted = [
+      "dos_endings.txt",
+      "heredocs_with_ignored_newlines.txt",
+      "seattlerb/block_call_dot_op2_brace_block.txt",
+      "seattlerb/block_command_operation_colon.txt",
+      "seattlerb/block_command_operation_dot.txt",
+      "seattlerb/heredoc__backslash_dos_format.txt",
+      "seattlerb/heredoc_backslash_nl.txt",
+      "seattlerb/heredoc_nested.txt",
+      "seattlerb/heredoc_squiggly_blank_line_plus_interpolation.txt",
+      "tilde_heredocs.txt",
+      "unparser/corpus/semantic/dstr.txt",
+      "whitequark/dedenting_heredoc.txt",
+      "whitequark/parser_drops_truncated_parts_of_squiggly_heredoc.txt",
+      "whitequark/parser_slash_slash_n_escaping_in_literals.txt",
+      "whitequark/send_block_chain_cmd.txt",
+      "whitequark/slash_newline_in_heredocs.txt"
+    ]
+
+    relatives.each do |relative|
+      # Skip the tests that Ripper is reporting the wrong results for.
+      next if incorrect.include?(relative)
+
+      # Skip the tests we haven't implemented yet.
+      next if omitted.include?(relative)
+
+      filepath = File.join(__dir__, "fixtures", relative)
+
+      define_method "test_ripper_#{relative}" do
+        source = File.read(filepath, binmode: true, external_encoding: Encoding::UTF_8)
+
+        case relative
+        when /break|next|redo|if|unless|rescue|control|keywords|retry/
+          source = "-> do\nrescue\n#{source}\nend"
+        end
+
+        case source
+        when /^ *yield/
+          source = "def __invalid_yield__\n#{source}\nend"
+        end
+
+        assert_ripper(source)
+      end
+    end
+
+    private
+
+    def assert_ripper(source)
+      assert_equal Ripper.sexp_raw(source), Prism::Translation::Ripper.sexp_raw(source)
+    end
+  end
+end