1 files changed, 21 insertions, 0 deletions
diff --git a/railties/test/paths_test.rb b/railties/test/paths_test.rb
index d50882110f..c724799d64 100644
--- a/railties/test/paths_test.rb
+++ b/railties/test/paths_test.rb
@@ -12,11 +12,32 @@ class PathsTest < ActiveSupport::TestCase
     assert_equal "/fiz/baz", root.path
   end
 
+  test "the paths object can be initialized with nil" do
+    assert_nothing_raised do
+      Rails::Application::Root.new(nil)
+    end
+  end
+
+  test "a paths object initialized with nil can be updated" do
+    root = Rails::Application::Root.new(nil)
+    root.app = "app"
+    root.path = "/root"
+    assert_equal ["/root/app"], root.app.to_a
+  end
+
   test "creating a root level path" do
     @root.app = "/foo/bar"
     assert_equal ["/foo/bar"], @root.app.to_a
   end
 
+  test "raises exception if root path never set" do
+    root = Rails::Application::Root.new(nil)
+    root.app = "app"
+    assert_raises RuntimeError do
+      root.app.to_a
+    end
+  end
+
   test "creating a root level path without assignment" do
     @root.app "/foo/bar"
     assert_equal ["/foo/bar"], @root.app.to_a