[Bug #18955] format single character for `%c`

2 files changed, 3 insertions, 2 deletions

diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 2c6fcee004..a50507a528 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -893,7 +893,7 @@ class TestM17N < Test::Unit::TestCase
       "%s%s" % [s("\xc2\xa1"), e("\xc2\xa1")]
     }
 
-    "%c" % "\u3042".encode('Windows-31J')
+    assert_equal("\u3042".encode('Windows-31J'), "%c" % "\u3042\u3044".encode('Windows-31J'))
   end
 
   def test_sprintf_p
diff --git a/test/ruby/test_sprintf.rb b/test/ruby/test_sprintf.rb
index b05f4f3e44..618e67264a 100644
--- a/test/ruby/test_sprintf.rb
+++ b/test/ruby/test_sprintf.rb
@@ -362,7 +362,8 @@ class TestSprintf < Test::Unit::TestCase
   def test_char
     assert_equal("a", sprintf("%c", 97))
     assert_equal("a", sprintf("%c", ?a))
-    assert_raise(ArgumentError) { sprintf("%c", sprintf("%c%c", ?a, ?a)) }
+    assert_equal("a", sprintf("%c", "a"))
+    assert_equal("a", sprintf("%c", sprintf("%c%c", ?a, ?a)))
     assert_equal(" " * (BSIZ - 1) + "a", sprintf(" " * (BSIZ - 1) + "%c", ?a))
     assert_equal(" " * (BSIZ - 1) + "a", sprintf(" " * (BSIZ - 1) + "%-1c", ?a))
     assert_equal(" " * BSIZ + "a", sprintf("%#{ BSIZ + 1 }c", ?a))