diff --git a/actionpack/lib/sprockets/helpers/rails_helper.rb b/actionpack/lib/sprockets/helpers/rails_helper.rb
index ec3d36d5ad..a65c5992ca 100644
--- a/actionpack/lib/sprockets/helpers/rails_helper.rb
+++ b/actionpack/lib/sprockets/helpers/rails_helper.rb
@@ -70,8 +70,8 @@ module Sprockets
 
     private
       def debug_assets?
-        params[:debug_assets] == '1' ||
-          params[:debug_assets] == 'true'
+        Rails.env.development? || Rails.env.test? ||
+          params[:debug_assets] == '1' || params[:debug_assets] == 'true'
       rescue NoMethodError
         false
       end
diff --git a/actionpack/test/template/sprockets_helper_test.rb b/actionpack/test/template/sprockets_helper_test.rb
index dfa635335e..d303acad0f 100644
--- a/actionpack/test/template/sprockets_helper_test.rb
+++ b/actionpack/test/template/sprockets_helper_test.rb
@@ -141,6 +141,8 @@ class SprocketsHelperTest < ActionView::TestCase
   end
 
   test "javascript include tag" do
+    Rails.env.stubs(:test?).returns(false)
+
     assert_match %r{<script src="/assets/application-[0-9a-f]+.js" type="text/javascript"></script>},
       javascript_include_tag(:application)
 
@@ -151,11 +153,17 @@ class SprocketsHelperTest < ActionView::TestCase
     assert_equal '<script src="http://www.example.com/xmlhr" type="text/javascript"></script>',
       javascript_include_tag("http://www.example.com/xmlhr")
 
-    assert_match %r{<script src="/assets/xmlhr-[0-9a-f]+.js\?body=1" type="text/javascript"></script>\n<script src="/assets/application-[0-9a-f]+.js\?body=1" type="text/javascript"></script>},
-      javascript_include_tag(:application, :debug => true)
-
-    assert_match %r{<script src=\"/assets/xmlhr-[0-9a-f]+.js\" type=\"text/javascript\"></script>\n<script src=\"/assets/extra-[0-9a-f]+.js\" type=\"text/javascript\"></script>},
+    assert_match %r{<script src=\"/assets/xmlhr-[0-9a-f]+.js" type=\"text/javascript\"></script>\n<script src=\"/assets/extra-[0-9a-f]+.js" type=\"text/javascript\"></script>},
       javascript_include_tag("xmlhr", "extra")
+
+    Rails.env.stubs(:test?).returns(true)
+
+    assert_match %r{<script src="/assets/xmlhr-[0-9a-f]+.js\?body=1" type="text/javascript"></script>\n<script src="/assets/application-[0-9a-f]+.js\?body=1" type="text/javascript"></script>},
+      javascript_include_tag(:application)
+
+    assert_match %r{<script src="/assets/application-[0-9a-f]+.js\" type="text/javascript"></script>},
+      javascript_include_tag(:application, :debug => false)
+
   end
 
   test "stylesheet path" do
@@ -172,6 +180,8 @@ class SprocketsHelperTest < ActionView::TestCase
   end
 
   test "stylesheet link tag" do
+    Rails.env.stubs(:test?).returns(false)
+
     assert_match %r{<link href="/assets/application-[0-9a-f]+.css" media="screen" rel="stylesheet" type="text/css" />},
       stylesheet_link_tag(:application)
 
@@ -187,11 +197,17 @@ class SprocketsHelperTest < ActionView::TestCase
     assert_match %r{<link href="/assets/style-[0-9a-f]+.css" media="print" rel="stylesheet" type="text/css" />},
       stylesheet_link_tag("style", :media => "print")
 
-    assert_match %r{<link href="/assets/style-[0-9a-f]+.css\?body=1" media="screen" rel="stylesheet" type="text/css" />\n<link href="/assets/application-[0-9a-f]+.css\?body=1" media="screen" rel="stylesheet" type="text/css" />},
-      stylesheet_link_tag(:application, :debug => true)
-
     assert_match %r{<link href="/assets/style-[0-9a-f]+.css" media="screen" rel="stylesheet" type="text/css" />\n<link href="/assets/extra-[0-9a-f]+.css" media="screen" rel="stylesheet" type="text/css" />},
       stylesheet_link_tag("style", "extra")
+
+    Rails.env.stubs(:test?).returns(true)
+
+    assert_match %r{<link href="/assets/style-[0-9a-f]+.css\?body=1" media="screen" rel="stylesheet" type="text/css" />\n<link href="/assets/application-[0-9a-f]+.css\?body=1" media="screen" rel="stylesheet" type="text/css" />},
+      stylesheet_link_tag(:application)
+
+    assert_match %r{<link href="/assets/application-[0-9a-f]+.css" media="screen" rel="stylesheet" type="text/css" />},
+      stylesheet_link_tag(:application, :debug => false)
+
   end
 
   test "alternate asset prefix" do