Emit BOOLEAN_ALLOWS_BOOLEAN_MESSAGE regardless of the order of the array of all booleans

Documented ensure_inclusion_of change

NEWS.md

@@ -5,6 +5,9 @@
 * Fix `delegate_method` so that it does not raise an error if the method that
   returns the delegate object is private.
 
+* Warn when `ensure_inclusion_of` is chained with `.in_array([false, true])`
+  as well as with `.in_array([true, false])`.
+
 ### Improvements
 
 * `have_and_belongs_to_many` now checks to make sure that the join table

lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb

@@ -382,7 +382,7 @@ EOT
         def disallows_value_outside_of_array?
           if attribute_type == :boolean
             case @array
-            when [true, false]
+            when [false, true], [true, false]
               Shoulda::Matchers.warn BOOLEAN_ALLOWS_BOOLEAN_MESSAGE
               return true
             when [nil]

spec/shoulda/matchers/active_model/validate_inclusion_of_matcher_spec.rb

@@ -449,16 +449,18 @@ describe Shoulda::Matchers::ActiveModel::ValidateInclusionOfMatcher do
         end
       end
 
-      it 'prints a warning' do
-        valid_values = [true, false]
-        builder = build_object_allowing(valid_values)
-        message = 'You are using `validate_inclusion_of` to assert that a boolean column allows boolean values and disallows non-boolean ones'
+      [[false, true], [true, false]].each do |booleans|
+        it 'prints a warning' do
+          valid_values = booleans
+          builder = build_object_allowing(valid_values)
+          message = 'You are using `validate_inclusion_of` to assert that a boolean column allows boolean values and disallows non-boolean ones'
 
-        stderr = capture(:stderr) do
-          expect_to_match_in_array(builder, valid_values)
+          stderr = capture(:stderr) do
+            expect_to_match_in_array(builder, valid_values)
+          end
+
+          expect(stderr.gsub(/\n+/, ' ')).to include(message)
         end
-
-        expect(stderr.gsub(/\n+/, ' ')).to include(message)
       end
     end
   end