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diff --git a/spec/rubyspec/library/uri/shared/extract.rb b/spec/rubyspec/library/uri/shared/extract.rb
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+++ b/spec/rubyspec/library/uri/shared/extract.rb
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+describe :uri_extract, shared: true do
+  it "behaves according to its documentation" do
+    @object.extract("text here http://foo.example.org/bla and here mailto:[email protected] and here also.").should == ["http://foo.example.org/bla", "mailto:[email protected]"]
+  end
+
+  it "treats contiguous URIs as a single URI" do
+    @object.extract('http://example.jphttp://example.jp').should == ['http://example.jphttp://example.jp']
+  end
+
+  it "treats pretty much anything with a colon as a URI" do
+    @object.extract('From: XXX [mailto:[email protected]]').should == ['From:', 'mailto:[email protected]]']
+  end
+
+  it "wraps a URI string in an array" do
+    @object.extract("http://github.com/brixen/rubyspec/tree/master").should == ["http://github.com/brixen/rubyspec/tree/master"]
+  end
+
+  it "pulls a variety of protocol URIs from a string" do
+    @object.extract("this is a string, it has http://rubini.us/ in it").should == ["http://rubini.us/"]
+    @object.extract("mailto:[email protected]").should == ["mailto:[email protected]"]
+    @object.extract("ftp://ruby-lang.org/").should == ["ftp://ruby-lang.org/"]
+    @object.extract("https://mail.google.com").should == ["https://mail.google.com"]
+    @object.extract("anything://example.com/").should == ["anything://example.com/"]
+  end
+
+  it "pulls all URIs within a string in order into an array when a block is not given" do
+    @object.extract("1.3. Example URI
+
+       The following examples illustrate URI that are in common use.
+
+       ftp://ftp.is.co.za/rfc/rfc1808.txt
+          -- ftp scheme for File Transfer Protocol services
+
+       gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles
+          -- gopher scheme for Gopher and Gopher+ Protocol services
+
+       http://www.math.uio.no/faq/compression-faq/part1.html
+          -- http scheme for Hypertext Transfer Protocol services
+
+       mailto:[email protected]
+          -- mailto scheme for electronic mail addresses
+
+       news:comp.infosystems.www.servers.unix
+          -- news scheme for USENET news groups and articles
+
+       telnet://melvyl.ucop.edu/
+          -- telnet scheme for interactive services via the TELNET Protocol
+    ").should == ["ftp://ftp.is.co.za/rfc/rfc1808.txt","gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles","http://www.math.uio.no/faq/compression-faq/part1.html","mailto:[email protected]","news:comp.infosystems.www.servers.unix","telnet://melvyl.ucop.edu/"]
+  end
+
+  it "yields each URI in the given string in order to a block, if given, and returns nil" do
+    results = ["http://foo.example.org/bla", "mailto:[email protected]"]
+    @object.extract("text here http://foo.example.org/bla and here mailto:[email protected] and here also.") {|uri|
+      uri.should == results.shift
+    }.should == nil
+    results.should == []
+  end
+
+  it "allows the user to specify a list of acceptable protocols of URIs to scan for" do
+    @object.extract("1.3. Example URI
+
+       The following examples illustrate URI that are in common use.
+
+       ftp://ftp.is.co.za/rfc/rfc1808.txt
+          -- ftp scheme for File Transfer Protocol services
+
+       gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles
+          -- gopher scheme for Gopher and Gopher+ Protocol services
+
+       http://www.math.uio.no/faq/compression-faq/part1.html
+          -- http scheme for Hypertext Transfer Protocol services
+
+       mailto:[email protected]
+          -- mailto scheme for electronic mail addresses
+
+       news:comp.infosystems.www.servers.unix
+          -- news scheme for USENET news groups and articles
+
+       telnet://melvyl.ucop.edu/
+          -- telnet scheme for interactive services via the TELNET Protocol
+    ", ["http","ftp","mailto"]).should == ["ftp://ftp.is.co.za/rfc/rfc1808.txt","http://www.math.uio.no/faq/compression-faq/part1.html","mailto:[email protected]"]
+  end
+end