1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/regexp/try_convert_spec.rb b/spec/ruby/core/regexp/try_convert_spec.rb
new file mode 100644
index 0000000000..da5e10adce
--- /dev/null
+++ b/spec/ruby/core/regexp/try_convert_spec.rb
@@ -0,0 +1,27 @@
+require_relative '../../spec_helper'
+
+describe "Regexp.try_convert" do
+  not_supported_on :opal do
+    it "returns the argument if given a Regexp" do
+      Regexp.try_convert(/foo/s).should == /foo/s
+    end
+  end
+
+  it "returns nil if given an argument that can't be converted to a Regexp" do
+    ['', 'glark', [], Object.new, :pat].each do |arg|
+      Regexp.try_convert(arg).should == nil
+    end
+  end
+
+  it "tries to coerce the argument by calling #to_regexp" do
+    rex = mock('regexp')
+    rex.should_receive(:to_regexp).and_return(/(p(a)t[e]rn)/)
+    Regexp.try_convert(rex).should == /(p(a)t[e]rn)/
+  end
+
+  it "raises a TypeError if the object does not return an Regexp from #to_regexp" do
+    obj = mock("regexp")
+    obj.should_receive(:to_regexp).and_return("string")
+    -> { Regexp.try_convert(obj) }.should raise_consistent_error(TypeError, "can't convert MockObject into Regexp (MockObject#to_regexp gives String)")
+  end
+end