1 files changed, 38 insertions, 0 deletions
diff --git a/test/ripper/test_ripper.rb b/test/ripper/test_ripper.rb
index ab841b7616..6061496d9c 100644
--- a/test/ripper/test_ripper.rb
+++ b/test/ripper/test_ripper.rb
@@ -14,6 +14,13 @@ class TestRipper::Ripper < Test::Unit::TestCase
     @ripper = Ripper.new '1 + 1'
   end
 
+  def test_new
+    assert_separately(%w[-rripper], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      assert_nil EnvUtil.under_gc_stress {Ripper.new("")}.state
+    end;
+  end
+
   def test_column
     assert_nil @ripper.column
   end
@@ -75,6 +82,15 @@ class TestRipper::Ripper < Test::Unit::TestCase
     assert_include out.string[/.*"local variable or method".*/], 'test_xxxx'
   end
 
+  def test_yydebug_string
+    out = StringIO.new
+    ripper = Ripper.new '"woot"'
+    ripper.yydebug = true
+    ripper.debug_output = out
+    ripper.parse
+    assert_include out.string[/.*"literal content".*/], '1.1-1.5'
+  end
+
   def test_regexp_with_option
     bug11932 = '[ruby-core:72638] [Bug #11932]'
     src = '/[\xC0-\xF0]/u'.dup.force_encoding(Encoding::UTF_8)
@@ -132,6 +148,28 @@ end
     assert_nothing_raised { Ripper.lex src }
   end
 
+  def test_no_memory_leak
+    assert_no_memory_leak(%w(-rripper), "", "#{<<~'end;'}", rss: true)
+      2_000_000.times do
+        Ripper.parse("")
+      end
+    end;
+
+    # [Bug #19835]
+    assert_no_memory_leak(%w(-rripper), "", "#{<<~'end;'}", rss: true)
+      1_000_000.times do
+        Ripper.parse("class Foo")
+      end
+    end;
+
+    # [Bug #19836]
+    assert_no_memory_leak(%w(-rripper), "", "#{<<~'end;'}", rss: true)
+      1_000_000.times do
+        Ripper.parse("-> {")
+      end
+    end;
+  end
+
   class TestInput < self
     Input = Struct.new(:lines) do
       def gets