test/unit: assert_raise_with_message

* lib/test/unit/assertions.rb (assert_raise_with_message): move from
  test/fileutils/test_fileutils.rb.  this is still experimental and
  the interface may be changed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41790 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Jul  5 11:29:47 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/test/unit/assertions.rb (assert_raise_with_message): move from
+	  test/fileutils/test_fileutils.rb.  this is still experimental and
+	  the interface may be changed.
+
 Fri Jul  5 11:08:00 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (w32_spawn): r41710 made that if the command starts with

lib/test/unit/assertions.rb

@@ -65,6 +65,42 @@ module Test
         assert_raises(*args, &b)
       end
 
+      # :call-seq:
+      #   assert_raise_with_message(exception, expected, msg = nil, &block)
+      #
+      #Tests if the given block raises an exception with the expected
+      #message.
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      nil #Fails, no Exceptions are raised
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise ArgumentError, "foo" #Fails, different Exception is raised
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise "bar" #Fails, RuntimeError is raised but the message differs
+      #    end
+      #
+      #    assert_raise_with_message(RuntimeError, "foo") do
+      #      raise "foo" #Raises RuntimeError with the message, so assertion succeeds
+      #    end
+      def assert_raise_with_message(exception, expected, msg = nil)
+        case expected
+        when String
+          assert = :assert_equal
+        when Regexp
+          assert = :assert_match
+        else
+          raise TypeError, "Expected #{expected.inspect} to be a kind of String or Regexp, not #{expected.class}"
+        end
+
+        ex = assert_raise(exception, msg) {yield}
+        msg = message(msg, "") {"Expected Exception(#{exception}) was raised, but the message doesn't match"}
+        __send__(assert, expected, ex.message, msg)
+      end
+
       # :call-seq:
       #   assert_nothing_raised( *args, &block )
       #

test/fileutils/test_fileutils.rb

@@ -962,23 +962,23 @@ class TestFileUtils
       assert_equal 0500, File.stat('tmp/a').mode & 07777
     end
 
-    assert_raises_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
+    assert_raise_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
       chmod "a", 'tmp/a'
     }
 
-    assert_raises_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
+    assert_raise_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
       chmod "x+a", 'tmp/a'
     }
 
-    assert_raises_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
+    assert_raise_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
       chmod "u+z", 'tmp/a'
     }
 
-    assert_raises_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
+    assert_raise_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
       chmod ",+x", 'tmp/a'
     }
 
-    assert_raises_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
+    assert_raise_with_message(ArgumentError, /invalid\b.*\bfile mode/) {
       chmod "755", 'tmp/a'
     }
 
@@ -1187,29 +1187,11 @@ class TestFileUtils
       uptodate? Pathname.new('tmp/a'), [Pathname.new('tmp/b'), Pathname.new('tmp/c')]
     }
     # [Bug #6708] [ruby-core:46256]
-    assert_raises_with_message(ArgumentError, "wrong number of arguments (3 for 2)") {
+    assert_raise_with_message(ArgumentError, "wrong number of arguments (3 for 2)") {
       uptodate?('new',['old', 'oldest'], {})
     }
   end
 
-  def assert_raises_with_message(klass, message)
-    begin
-      yield
-      flunk("Expected Exception #{klass} didn't raise")
-    rescue klass => ex
-      if message.kind_of? String
-        flag = !!(ex.message == message)
-        assert(flag, "Expected Exception(#{klass}) was raised, but the message doesn't match")
-      elsif message.kind_of? Regexp
-        flag = !!(ex.message =~ message)
-        assert(flag, "Expected Exception(#{klass}) was raised, but the message doesn't match")
-      else
-        raise
-      end
-    end
-  end
-  private :assert_raises_with_message
-
   def test_cd
     check_singleton :cd
   end