Add test task and fix some cases

README.md

@@ -191,7 +191,10 @@ some input and returns a `ParserResult`.
 
 ## Running tests
 
-    $ ruby -Ilib:test test/test_parser.rb
+``` shell
+rake test
+ruby -Ilib:test test/test_parser.rb # per-file testing
+```
 
 # TODO
 Decent syntax error reporting, eg: Which line, which column failed.

Rakefile

@@ -0,0 +1,5 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.test_files = FileList["test/test_*.rb"]
+end

lib/parser_result.rb

@@ -7,7 +7,7 @@ def initialize(success, remaining, matched, output=nil)
     @output = output.nil? ? [matched] : output
   end
 
-  def self.ok(output=nil, matched:, remaining:)
+  def self.ok(output=nil, matched: "", remaining: "")
 #    yield matched if block_given?
     output = [matched] if output.nil?
     ParserResult.new(true, remaining, matched, output)

test/test_base_parsers.rb

@@ -132,15 +132,15 @@
       start(:letterOrNumber)
     end
 
-    assert_equal ["w", "8"], parser.run("w8").output
+    assert_equal [["w"], ["8"]], parser.run("w8").output
 
     parser = Grammar.build do
       rule(:letter)         { many1 { anyLetter } }
       rule(:letterOrNumber) { seq rule(:letter), anyNumber, lambda { |letter, number| [letter, number] } }
       start(:letterOrNumber)
     end
 
-    assert_equal ["w", "8"], parser.run("w8").output
+    assert_equal [["w"], ["8"]], parser.run("w8").output
   end
 
   it "uses regex" do