use test helpers

1 files changed, 7 insertions, 10 deletions

diff --git a/Library/Formula/jsonpp.rb b/Library/Formula/jsonpp.rb
index 4cdbf632d..0c00153fe 100644
--- a/Library/Formula/jsonpp.rb
+++ b/Library/Formula/jsonpp.rb
@@ -11,15 +11,12 @@ class Jsonpp < Formula
   end
 
   test do
-    IO.popen("#{bin}/jsonpp", "w+") do |pipe|
-      pipe.puts '{"foo":"bar","baz":"qux"}'
-      pipe.close_write
-      assert_equal <<-EOS.undent, pipe.read
-        {
-          "foo": "bar",
-          "baz": "qux"
-        }
-      EOS
-    end
+    expected = <<-EOS.undent.chomp
+      {
+        "foo": "bar",
+        "baz": "qux"
+      }
+    EOS
+    assert_equal expected, pipe_output(bin/"jsonpp", '{"foo":"bar","baz":"qux"}')
   end
 end