Updated rake specs for latest assertions.

[git-p4: depot-paths = "//src/minitest/dev/": change = 12550]

Rakefile

@@ -21,7 +21,7 @@ task :specs do
   require "minitest/spec"
 
   pos_prefix, neg_prefix = "must", "wont"
-  skip_re = /^(must|wont)$|wont_(throw)|must_(block|not?_|nothing|raise$)/x
+  skip_re = /^(must|wont)$|wont_(throw)|must_(block|not?_|nothing|send|raise$)/x
   dont_flip_re = /(must|wont)_(include|respond_to)/
 
   map = {
@@ -32,6 +32,8 @@ task :specs do
     /_includes/                            => "_include",
     /(must|wont)_(.*_of|nil|silent|empty)/ => '\1_be_\2',
     /must_raises/                          => "must_raise",
+    /(must|wont)_predicate/                => '\1_be',
+    /(must|wont)_path_exists/              => 'path_\1_exist',
   }
 
   expectations = Minitest::Expectations.public_instance_methods.map(&:to_s)