1 files changed, 32 insertions, 0 deletions
diff --git a/mrbgems/mruby-string-utf8/test/string.rb b/mrbgems/mruby-string-utf8/test/string.rb
new file mode 100644
index 000000000..bfa5f0170
--- /dev/null
+++ b/mrbgems/mruby-string-utf8/test/string.rb
@@ -0,0 +1,32 @@
+##
+# String(utf8) Test
+
+assert('String#[]') do
+  assert_equal "ち", "こんにちわ世界"[3]
+  assert_equal nil, "こんにちわ世界"[20]
+  assert_equal "世", "こんにちわ世界"[-2]
+  assert_equal "世界", "こんにちわ世界"[-2..-1]
+  assert_equal "んに", "こんにちわ世界"[1,2]
+  assert_equal "世", "こんにちわ世界"["世"]
+end
+
+assert('String#reverse', '15.2.10.5.29') do
+  a = 'こんにちわ世界!'
+  a.reverse
+    
+  assert_equal 'こんにちわ世界!', a
+  assert_equal '!界世わちにんこ', 'こんにちわ世界!'.reverse
+end
+
+assert('String#reverse!', '15.2.10.5.30') do
+  a = 'こんにちわ世界!'
+  a.reverse!
+    
+  assert_equal '!界世わちにんこ', a
+  assert_equal '!界世わちにんこ', 'こんにちわ世界!'.reverse!
+end
+
+assert('Invalid sequence') do
+  assert_equal 5, "\xF8\x88\x80\x80\x80".size
+  assert_equal 6, "\xFC\x84\x80\x80\x80\x80".size
+end