Add tests about String's internal capacity

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53671 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/ext/-test-/string/capacity.c b/ext/-test-/string/capacity.c
new file mode 100644
index 0000000000..ba7fb85e9e
--- /dev/null
+++ b/ext/-test-/string/capacity.c
@@ -0,0 +1,17 @@
+#include "ruby.h"
+#include "internal.h"
+
+static VALUE
+bug_str_capacity(VALUE klass, VALUE str)
+{
+    return
+	STR_EMBED_P(str) ? INT2FIX(RSTRING_EMBED_LEN_MAX) : \
+	STR_SHARED_P(str) ? INT2FIX(0) : \
+	LONG2FIX(RSTRING(str)->as.heap.aux.capa);
+}
+
+void
+Init_capacity(VALUE klass)
+{
+    rb_define_singleton_method(klass, "capacity", bug_str_capacity, 1);
+}