Remove warning about #capture under 4.2+

spec/support/unit/capture.rb

@@ -1,19 +1,34 @@
 module Kernel
-  unless method_defined?(:capture)
-    def capture(stream)
-      stream = stream.to_s
-      captured_stream = Tempfile.new(stream)
-      stream_io = eval("$#{stream}")
-      origin_stream = stream_io.dup
-      stream_io.reopen(captured_stream)
+  # #capture, #silence_stream, and #silence_stderr are deprecated after Rails
+  # 4.2 and will be removed in 5.0, so just override them completely here
 
-      yield
+  def capture(stream)
+    stream = stream.to_s
+    captured_stream = Tempfile.new(stream)
+    stream_io = eval("$#{stream}")
+    origin_stream = stream_io.dup
+    stream_io.reopen(captured_stream)
 
-      stream_io.rewind
-      return captured_stream.read
-    ensure
-      captured_stream.unlink
-      stream_io.reopen(origin_stream)
-    end
+    yield
+
+    stream_io.rewind
+    return captured_stream.read
+  ensure
+    captured_stream.unlink
+    stream_io.reopen(origin_stream)
+  end
+
+  def silence_stream(stream)
+    old_stream = stream.dup
+    stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
+    stream.sync = true
+    yield
+  ensure
+    stream.reopen(old_stream)
+    old_stream.close
+  end
+
+  def silence_stderr
+    silence_stream(STDERR) { yield }
   end
 end

spec/unit/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb

@@ -437,7 +437,7 @@ describe Shoulda::Matchers::ActiveModel::ValidateInclusionOfMatcher, type: :mode
       it 'matches' do
         valid_values = [true, false]
         builder = build_object_allowing(valid_values)
-        capture(:stderr) do
+        silence_stderr do
           expect_to_match_in_array(builder, valid_values)
         end
       end
@@ -469,7 +469,7 @@ describe Shoulda::Matchers::ActiveModel::ValidateInclusionOfMatcher, type: :mode
           it 'matches' do
             valid_values = [nil]
             builder = build_object_allowing(valid_values)
-            capture(:stderr) do
+            silence_stderr do
               expect_to_match_in_array(builder, valid_values)
             end
           end