1 files changed, 128 insertions, 0 deletions
diff --git a/spec/ruby/core/string/chop_spec.rb b/spec/ruby/core/string/chop_spec.rb
new file mode 100644
index 0000000000..4e9a39f866
--- /dev/null
+++ b/spec/ruby/core/string/chop_spec.rb
@@ -0,0 +1,128 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#chop" do
+  it "removes the final character" do
+    "abc".chop.should == "ab"
+  end
+
+  it "removes the final carriage return" do
+    "abc\r".chop.should == "abc"
+  end
+
+  it "removes the final newline" do
+    "abc\n".chop.should == "abc"
+  end
+
+  it "removes the final carriage return, newline" do
+    "abc\r\n".chop.should == "abc"
+  end
+
+  it "removes the carrige return, newline if they are the only characters" do
+    "\r\n".chop.should == ""
+  end
+
+  it "does not remove more than the final carriage return, newline" do
+    "abc\r\n\r\n".chop.should == "abc\r\n"
+  end
+
+  with_feature :encoding do
+    it "removes a multi-byte character" do
+      "あれ".chop.should == "あ"
+    end
+
+    it "removes the final carriage return, newline from a multibyte String" do
+      "あれ\r\n".chop.should == "あれ"
+    end
+
+    it "removes the final carriage return, newline from a non-ASCII String" do
+      str = "abc\r\n".encode "utf-32be"
+      str.chop.should == "abc".encode("utf-32be")
+    end
+  end
+
+  it "returns an empty string when applied to an empty string" do
+    "".chop.should == ""
+  end
+
+  it "returns a new string when applied to an empty string" do
+    s = ""
+    s.chop.should_not equal(s)
+  end
+
+  it "taints result when self is tainted" do
+    "hello".taint.chop.tainted?.should == true
+    "".taint.chop.tainted?.should == true
+  end
+
+  it "untrusts result when self is untrusted" do
+    "hello".untrust.chop.untrusted?.should == true
+    "".untrust.chop.untrusted?.should == true
+  end
+
+  it "returns subclass instances when called on a subclass" do
+    StringSpecs::MyString.new("hello\n").chop.should be_an_instance_of(StringSpecs::MyString)
+  end
+end
+
+describe "String#chop!" do
+  it "removes the final character" do
+    "abc".chop!.should == "ab"
+  end
+
+  it "removes the final carriage return" do
+    "abc\r".chop!.should == "abc"
+  end
+
+  it "removes the final newline" do
+    "abc\n".chop!.should == "abc"
+  end
+
+  it "removes the final carriage return, newline" do
+    "abc\r\n".chop!.should == "abc"
+  end
+
+  it "removes the carrige return, newline if they are the only characters" do
+    "\r\n".chop!.should == ""
+  end
+
+  it "does not remove more than the final carriage return, newline" do
+    "abc\r\n\r\n".chop!.should == "abc\r\n"
+  end
+
+  with_feature :encoding do
+    it "removes a multi-byte character" do
+      "あれ".chop!.should == "あ"
+    end
+
+    it "removes the final carriage return, newline from a multibyte String" do
+      "あれ\r\n".chop!.should == "あれ"
+    end
+
+    it "removes the final carriage return, newline from a non-ASCII String" do
+      str = "abc\r\n".encode "utf-32be"
+      str.chop!.should == "abc".encode("utf-32be")
+    end
+  end
+
+  it "returns self if modifications were made" do
+    str = "hello"
+    str.chop!.should equal(str)
+  end
+
+  it "returns nil when called on an empty string" do
+    "".chop!.should be_nil
+  end
+
+  it "raises a RuntimeError on a frozen instance that is modified" do
+    lambda { "string\n\r".freeze.chop! }.should raise_error(RuntimeError)
+  end
+
+  # see [ruby-core:23666]
+  it "raises a RuntimeError on a frozen instance that would not be modified" do
+    a = ""
+    a.freeze
+    lambda { a.chop! }.should raise_error(RuntimeError)
+  end
+end