1 files changed, 28 insertions, 0 deletions
diff --git a/spec/ruby/core/string/shared/length.rb b/spec/ruby/core/string/shared/length.rb
new file mode 100644
index 0000000000..0e6e66ee1c
--- /dev/null
+++ b/spec/ruby/core/string/shared/length.rb
@@ -0,0 +1,28 @@
+# encoding: utf-8
+
+describe :string_length, shared: true do
+  it "returns the length of self" do
+    "".send(@method).should == 0
+    "\x00".send(@method).should == 1
+    "one".send(@method).should == 3
+    "two".send(@method).should == 3
+    "three".send(@method).should == 5
+    "four".send(@method).should == 4
+  end
+
+  with_feature :encoding do
+    it "returns the length of a string in different encodings" do
+      utf8_str = 'こにちわ' * 100
+      utf8_str.size.should == 400
+      utf8_str.encode(Encoding::UTF_32BE).size.should == 400
+      utf8_str.encode(Encoding::SHIFT_JIS).size.should == 400
+    end
+
+    it "returns the length of the new self after encoding is changed" do
+      str = 'こにちわ'
+      str.send(@method)
+
+      str.force_encoding('ASCII-8BIT').send(@method).should == 12
+    end
+  end
+end