1 files changed, 19 insertions, 0 deletions
diff --git a/spec/mspec/lib/mspec/guards/conflict.rb b/spec/mspec/lib/mspec/guards/conflict.rb
new file mode 100644
index 0000000000..c1d33e3512
--- /dev/null
+++ b/spec/mspec/lib/mspec/guards/conflict.rb
@@ -0,0 +1,19 @@
+require 'mspec/guards/guard'
+
+class ConflictsGuard < SpecGuard
+  def match?
+    # Always convert constants to symbols regardless of version.
+    constants = Object.constants.map { |x| x.to_sym }
+    @parameters.any? { |mod| constants.include? mod }
+  end
+end
+
+class Object
+  # In some cases, libraries will modify another Ruby method's
+  # behavior. The specs for the method's behavior will then fail
+  # if that library is loaded. This guard will not run if any of
+  # the specified constants exist in Object.constants.
+  def conflicts_with(*modules, &block)
+    ConflictsGuard.new(*modules).run_unless(:conflicts_with, &block)
+  end
+end