1 files changed, 62 insertions, 0 deletions
diff --git a/spec/ruby/core/regexp/to_s_spec.rb b/spec/ruby/core/regexp/to_s_spec.rb
new file mode 100644
index 0000000000..a23fd78975
--- /dev/null
+++ b/spec/ruby/core/regexp/to_s_spec.rb
@@ -0,0 +1,62 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Regexp#to_s" do
+  not_supported_on :opal do
+    it "displays options if included" do
+      /abc/mxi.to_s.should == "(?mix:abc)"
+    end
+  end
+
+  it "shows non-included options after a - sign" do
+    /abc/i.to_s.should == "(?i-mx:abc)"
+  end
+
+  it "shows all options as excluded if none are selected" do
+    /abc/.to_s.should == "(?-mix:abc)"
+  end
+
+  it "shows the pattern after the options" do
+    not_supported_on :opal do
+      /ab+c/mix.to_s.should == "(?mix:ab+c)"
+    end
+    /xyz/.to_s.should == "(?-mix:xyz)"
+  end
+
+  not_supported_on :opal do
+    it "displays groups with options" do
+      /(?ix:foo)(?m:bar)/.to_s.should == "(?-mix:(?ix:foo)(?m:bar))"
+      /(?ix:foo)bar/m.to_s.should == "(?m-ix:(?ix:foo)bar)"
+    end
+
+    it "displays single group with same options as main regex as the main regex" do
+      /(?i:nothing outside this group)/.to_s.should == "(?i-mx:nothing outside this group)"
+    end
+  end
+
+  not_supported_on :opal do
+    it "deals properly with uncaptured groups" do
+      /whatever(?:0d)/ix.to_s.should == "(?ix-m:whatever(?:0d))"
+    end
+  end
+
+  it "deals properly with the two types of lookahead groups" do
+    /(?=5)/.to_s.should == "(?-mix:(?=5))"
+    /(?!5)/.to_s.should == "(?-mix:(?!5))"
+  end
+
+  it "returns a string in (?xxx:yyy) notation" do
+    not_supported_on :opal do
+      /ab+c/ix.to_s.should == "(?ix-m:ab+c)"
+      /jis/s.to_s.should == "(?-mix:jis)"
+      /(?i:.)/.to_s.should == "(?i-mx:.)"
+    end
+    /(?:.)/.to_s.should == "(?-mix:.)"
+  end
+
+  not_supported_on :opal do
+    it "handles abusive option groups" do
+      /(?mmmmix-miiiix:)/.to_s.should == '(?-mix:)'
+    end
+  end
+
+end