1 files changed, 36 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..1f1f9daec6
--- /dev/null
+++ b/spec/ruby/core/matchdata/pre_match_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+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 "keeps taint status from the source string" do
+    str = "THX1138: The Movie"
+    str.taint
+    res = /(.)(.)(\d+)(\d)/.match(str).pre_match
+    res.tainted?.should be_true
+    $`.tainted?.should be_true
+  end
+
+  it "keeps untrusted status from the source string" do
+    str = "THX1138: The Movie"
+    str.untrust
+    res = /(.)(.)(\d+)(\d)/.match(str).pre_match
+    res.untrusted?.should be_true
+    $`.untrusted?.should be_true
+  end
+
+  with_feature :encoding do
+    it "sets the encoding to the encoding of the source String" do
+      str = "abc".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".force_encoding Encoding::ISO_8859_1
+      str.match(/a/).pre_match.encoding.should equal(Encoding::ISO_8859_1)
+    end
+  end
+end