[ruby/reline] Add assertion to auto_indent_proc's parameter, add

Ctrl-d exit test
(https://github.com/ruby/reline/pull/574)

* Add auto_indent_proc's parameter assertion in multiline_repl

* Add rendering test for Ctrl-d exit

https://github.com/ruby/reline/commit/46db71132a

1 files changed, 16 insertions, 0 deletions

diff --git a/test/reline/yamatanooroti/multiline_repl b/test/reline/yamatanooroti/multiline_repl
index 73f5159ee2..bdefc48faa 100755
--- a/test/reline/yamatanooroti/multiline_repl
+++ b/test/reline/yamatanooroti/multiline_repl
@@ -59,8 +59,24 @@ opt.on('--dynamic-prompt-show-line') {
     }
   }
 }
+
+def assert_auto_indent_params(lines, line_index, byte_pointer, is_newline)
+  raise 'Wrong lines type' unless lines.all?(String)
+
+  line = lines[line_index]
+  raise 'Wrong line_index value' unless line
+
+  # The condition `byte_pointer <= line.bytesize` is not satisfied. Maybe bug.
+  # Instead, loose constraint `byte_pointer <= line.bytesize + 1` seems to be satisfied when is_newline is false.
+  return if is_newline
+
+  raise 'byte_pointer out of bounds' unless byte_pointer <= line.bytesize + 1
+  raise 'Invalid byte_pointer' unless line.byteslice(0, byte_pointer).valid_encoding?
+end
+
 opt.on('--auto-indent') {
   Reline.auto_indent_proc = lambda do |lines, line_index, byte_pointer, is_newline|
+    assert_auto_indent_params(lines, line_index, byte_pointer, is_newline)
     AutoIndent.calculate_indent(lines, line_index, byte_pointer, is_newline)
   end
 }