1 files changed, 19 insertions, 0 deletions
diff --git a/test/-ext-/string/test_capacity.rb b/test/-ext-/string/test_capacity.rb
index 65444123a7..df59e76778 100644
--- a/test/-ext-/string/test_capacity.rb
+++ b/test/-ext-/string/test_capacity.rb
@@ -37,4 +37,23 @@ class Test_StringCapacity < Test::Unit::TestCase
     open(__FILE__) {|f|s = f.read(1024*1024)}
     assert_operator(capa(s), :<=, s.bytesize+4096)
   end
+
+  def test_literal_capacity
+    s = "I am testing string literal capacity"
+    assert_equal(s.length, capa(s))
+  end
+
+  def test_capacity_frozen
+    s = String.new("I am testing", capacity: 1000)
+    s << "fstring capacity"
+    s.freeze
+    assert_equal(s.length, capa(s))
+  end
+
+  def test_capacity_fstring
+    s = String.new("I am testing", capacity: 1000)
+    s << "fstring capacity"
+    s = -s
+    assert_equal(s.length, capa(s))
+  end
 end