DEV: Remove the use of stubs on Rails.logger in our test suite.

spec/support/fake_logger.rb

@@ -0,0 +1,16 @@
+class FakeLogger
+  attr_reader :warnings, :errors
+
+  def initialize
+    @warnings = []
+    @errors = []
+  end
+
+  def warn(message)
+    @warnings << message
+  end
+
+  def error(message)
+    @errors << message
+  end
+end