[ruby/yarp] Add test for empty heredoc

https://github.com/ruby/yarp/commit/e49b63a79e

2 files changed, 10 insertions, 6 deletions

diff --git a/test/yarp/fixtures/dash_heredocs.txt b/test/yarp/fixtures/dash_heredocs.txt
index a05df93023..aba782c99a 100644
--- a/test/yarp/fixtures/dash_heredocs.txt
+++ b/test/yarp/fixtures/dash_heredocs.txt
@@ -39,6 +39,9 @@ EOF
   b
 EOF
 
+<<-''
+
+
 <<-'EOF'
   a #{1}
 EOF
diff --git a/test/yarp/snapshots/dash_heredocs.txt b/test/yarp/snapshots/dash_heredocs.txt
index bc4c90a76f..ad79c46251 100644
--- a/test/yarp/snapshots/dash_heredocs.txt
+++ b/test/yarp/snapshots/dash_heredocs.txt
@@ -1,6 +1,6 @@
-ProgramNode(0...223)(
+ProgramNode(0...231)(
   [],
-  StatementsNode(0...223)(
+  StatementsNode(0...231)(
     [InterpolatedStringNode(0...15)(
        (0...6),
        [StringNode(7...11)(nil, (7...11), nil, "  a\n")],
@@ -112,10 +112,11 @@ ProgramNode(0...223)(
        [StringNode(188...196)(nil, (188...196), nil, "  a\n" + "  b\n")],
        (196...200)
      ),
-     InterpolatedStringNode(201...223)(
-       (201...209),
-       [StringNode(210...219)(nil, (210...219), nil, "  a \#{1}\n")],
-       (219...223)
+     InterpolatedStringNode(201...208)((201...206), [], (207...208)),
+     InterpolatedStringNode(209...231)(
+       (209...217),
+       [StringNode(218...227)(nil, (218...227), nil, "  a \#{1}\n")],
+       (227...231)
      )]
   )
 )