diff --git a/spec/support/inspect_squelch.rb b/spec/support/inspect_squelch.rb
new file mode 100644
index 00000000000..8ee6732370b
--- /dev/null
+++ b/spec/support/inspect_squelch.rb
@@ -0,0 +1,7 @@
+# This class can generate a lot of output if it fails,
+# so squelch the instance variable output.
+class ActiveSupport::Cache::NullStore
+  def inspect
+    "<#{self.class}>"
+  end
+end