Add specs for inject

spec/ruby/core/enumerable/shared/inject.rb

@@ -18,6 +18,10 @@
     EnumerableSpecs::Numerous.new(1, 2, 3).send(@method, 10, :-).should == 4
   end
 
+  it "can take a string as the second argument" do
+    EnumerableSpecs::Numerous.new(1, 2, 3).send(@method, 10, "-").should == 4
+  end
+
   it "ignores the block if two arguments" do
     -> {
       EnumerableSpecs::Numerous.new(1, 2, 3).send(@method, 10, :-) { raise "we never get here"}.should == 4
@@ -41,6 +45,10 @@
     EnumerableSpecs::Numerous.new(10, 1, 2, 3).send(@method, :-).should == 4
   end
 
+  it "can take a string argument" do
+    EnumerableSpecs::Numerous.new(10, 1, 2, 3).send(@method, "-").should == 4
+  end
+
   it "without argument takes a block with an accumulator (with first element as initial value) and the current element. Value of block becomes new accumulator" do
     a = []
     EnumerableSpecs::Numerous.new.send(@method) { |memo, i| a << [memo, i]; i }