1 files changed, 24 insertions, 0 deletions
diff --git a/spec/ruby/core/matchdata/pre_match_spec.rb b/spec/ruby/core/matchdata/pre_match_spec.rb
new file mode 100644
index 0000000000..106612a4f7
--- /dev/null
+++ b/spec/ruby/core/matchdata/pre_match_spec.rb
@@ -0,0 +1,24 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "MatchData#pre_match" do
+  it "returns the string before the match, equiv. special var $`" do
+    /(.)(.)(\d+)(\d)/.match("THX1138: The Movie").pre_match.should == 'T'
+    $`.should == 'T'
+  end
+
+  it "sets the encoding to the encoding of the source String" do
+    str = "abc".dup.force_encoding Encoding::EUC_JP
+    str.match(/b/).pre_match.encoding.should.equal?(Encoding::EUC_JP)
+  end
+
+  it "sets an empty result to the encoding of the source String" do
+    str = "abc".dup.force_encoding Encoding::ISO_8859_1
+    str.match(/a/).pre_match.encoding.should.equal?(Encoding::ISO_8859_1)
+  end
+
+  it "returns an instance of String when given a String subclass" do
+    str = MatchDataSpecs::MyString.new("THX1138: The Movie")
+    /(.)(.)(\d+)(\d)/.match(str).pre_match.should.instance_of?(String)
+  end
+end