Add a test case for save(validate:false) with invalid foreign key.

It is supposed to raise ActiveRecord::InvalidForeignKey when the
database has a fk constraint.

activerecord/test/cases/adapter_test.rb

@@ -146,7 +146,7 @@ module ActiveRecord
     end
 
     def test_foreign_key_violations_are_translated_to_specific_exception
-      unless @connection.adapter_name == 'SQLite'
+      unless current_adapter?(:SQLite3Adapter)
         assert_raises(ActiveRecord::InvalidForeignKey) do
           # Oracle adapter uses prefetched primary key values from sequence and passes them to connection adapter insert method
           if @connection.prefetch_primary_key?
@@ -159,6 +159,20 @@ module ActiveRecord
       end
     end
 
+    def test_foreign_key_violations_are_translated_to_specific_exception_with_validate_false
+      unless current_adapter?(:SQLite3Adapter)
+        klass_has_fk = Class.new(ActiveRecord::Base) do
+          self.table_name = 'fk_test_has_fk'
+        end
+
+        assert_raises(ActiveRecord::InvalidForeignKey) do
+          has_fk = klass_has_fk.new
+          has_fk.fk_id = 1231231231
+          has_fk.save(validate: false)
+        end
+      end
+    end
+
     def test_disable_referential_integrity
       assert_nothing_raised do
         @connection.disable_referential_integrity do