1 files changed, 24 insertions, 0 deletions
diff --git a/spec/ruby/core/string/b_spec.rb b/spec/ruby/core/string/b_spec.rb
new file mode 100644
index 0000000000..89fcedf7c4
--- /dev/null
+++ b/spec/ruby/core/string/b_spec.rb
@@ -0,0 +1,24 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "String#b" do
+  with_feature :encoding do
+    it "returns an ASCII-8BIT encoded string" do
+      "Hello".b.should == "Hello".force_encoding(Encoding::ASCII_8BIT)
+      "こんちには".b.should == "こんちには".force_encoding(Encoding::ASCII_8BIT)
+    end
+
+    it "returns new string without modifying self" do
+      str = "こんちには"
+      str.b.should_not equal(str)
+      str.should == "こんちには"
+    end
+
+    it "copies own tainted/untrusted status to the returning value" do
+      utf_8 = "こんちには".taint.untrust
+      ret = utf_8.b
+      ret.tainted?.should be_true
+      ret.untrusted?.should be_true
+    end
+  end
+end