Add a test for r35863.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35867 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/-test-/string/coderange.c

@@ -0,0 +1,29 @@
+#include "ruby/ruby.h"
+#include "ruby/encoding.h"
+
+static VALUE sym_7bit, sym_valid, sym_unknown, sym_broken;
+static VALUE
+str_coderange(VALUE str)
+{
+    switch (ENC_CODERANGE(str)) {
+      case ENC_CODERANGE_7BIT:
+	return sym_7bit;
+      case ENC_CODERANGE_VALID:
+	return sym_valid;
+      case ENC_CODERANGE_UNKNOWN:
+	return sym_unknown;
+      case ENC_CODERANGE_BROKEN:
+	return sym_broken;
+    }
+    UNREACHABLE;
+}
+
+void
+Init_coderange(VALUE klass)
+{
+    sym_7bit = ID2SYM(rb_intern("7bit"));
+    sym_valid = ID2SYM(rb_intern("valid"));
+    sym_unknown = ID2SYM(rb_intern("unknown"));
+    sym_broken = ID2SYM(rb_intern("broken"));
+    rb_define_method(klass, "coderange", str_coderange, 0);
+}

ext/-test-/string/enc_str_buf_cat.c

@@ -0,0 +1,14 @@
+#include "ruby/ruby.h"
+#include "ruby/encoding.h"
+
+static VALUE
+enc_str_buf_cat(VALUE str, VALUE str2)
+{
+    return rb_enc_str_buf_cat(str, RSTRING_PTR(str2), RSTRING_LEN(str2), rb_enc_get(str2));
+}
+
+void
+Init_enc_str_buf_cat(VALUE klass)
+{
+    rb_define_method(klass, "enc_str_buf_cat", enc_str_buf_cat, 1);
+}

test/-ext-/string/test_enc_str_buf_cat.rb

@@ -0,0 +1,15 @@
+require 'test/unit'
+require "-test-/string/string"
+
+class Test_StringEncStrBufCat < Test::Unit::TestCase
+  Bug6509 = '[ruby-dev:45688]'
+
+  def test_unknown
+    a8_str = "a\xBE".force_encoding(Encoding::ASCII_8BIT)
+    cr_unknown_str = [0x62].pack('C*')
+    assert_equal(true, a8_str.valid_encoding?, "an assertion for following tests")
+    assert_equal(:valid, Bug::String.new(a8_str).coderange, "an assertion for following tests")
+    assert_equal(:unknown, Bug::String.new(cr_unknown_str).coderange, "an assertion for following tests")
+    assert_equal(:valid, Bug::String.new(a8_str).enc_str_buf_cat(cr_unknown_str).coderange, Bug6509)
+  end
+end