1 files changed, 62 insertions, 0 deletions
diff --git a/spec/ruby/core/regexp/encoding_spec.rb b/spec/ruby/core/regexp/encoding_spec.rb
new file mode 100644
index 0000000000..fb4fdba064
--- /dev/null
+++ b/spec/ruby/core/regexp/encoding_spec.rb
@@ -0,0 +1,62 @@
+# -*- encoding: utf-8 -*-
+require_relative '../../spec_helper'
+
+describe "Regexp#encoding" do
+  it "returns an Encoding object" do
+    /glar/.encoding.should.instance_of?(Encoding)
+  end
+
+  it "defaults to US-ASCII if the Regexp contains only US-ASCII character" do
+    /ASCII/.encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns US_ASCII if the 'n' modifier is supplied and only US-ASCII characters are present" do
+    /ASCII/n.encoding.should == Encoding::US_ASCII
+  end
+
+  it "returns BINARY if the 'n' modifier is supplied and non-US-ASCII characters are present" do
+    /\xc2\xa1/n.encoding.should == Encoding::BINARY
+  end
+
+  it "defaults to UTF-8 if \\u escapes appear" do
+    /\u{9879}/.encoding.should == Encoding::UTF_8
+  end
+
+  it "defaults to UTF-8 if a literal UTF-8 character appears" do
+    /¥/.encoding.should == Encoding::UTF_8
+  end
+
+  it "returns UTF-8 if the 'u' modifier is supplied" do
+    /ASCII/u.encoding.should == Encoding::UTF_8
+  end
+
+  it "returns Windows-31J if the 's' modifier is supplied" do
+    /ASCII/s.encoding.should == Encoding::Windows_31J
+  end
+
+  it "returns EUC_JP if the 'e' modifier is supplied" do
+    /ASCII/e.encoding.should == Encoding::EUC_JP
+  end
+
+  it "upgrades the encoding to that of an embedded String" do
+    str = "文字化け".encode('euc-jp')
+    /#{str}/.encoding.should == Encoding::EUC_JP
+  end
+
+  it "ignores the encoding and uses US-ASCII if the string has only ASCII characters" do
+    str = "abc".encode('euc-jp')
+    str.encoding.should == Encoding::EUC_JP
+    /#{str}/.encoding.should == Encoding::US_ASCII
+  end
+
+  it "ignores the default_internal encoding" do
+    old_internal = Encoding.default_internal
+    Encoding.default_internal = Encoding::EUC_JP
+    /foo/.encoding.should_not == Encoding::EUC_JP
+    Encoding.default_internal = old_internal
+  end
+
+  it "allows otherwise invalid characters if NOENCODING is specified" do
+    Regexp.new('([\x00-\xFF])', Regexp::IGNORECASE | Regexp::NOENCODING).encoding.should == Encoding::BINARY
+  end
+end