add tests surrounding behavior of save and save! for associations that have validation errors

activerecord/test/cases/associations/has_many_through_associations_test.rb

@@ -774,6 +774,14 @@ def test_create_should_not_raise_exception_when_join_record_has_errors
     end
   end
 
+  def test_save_should_not_raise_exception_when_join_record_has_errors
+    repair_validations(Categorization) do
+      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
+      c = Category.create(:name => 'Fishing', :authors => [Author.first])
+      c.save
+    end
+  end
+
   def test_create_bang_should_raise_exception_when_join_record_has_errors
     repair_validations(Categorization) do
       Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
@@ -782,4 +790,22 @@ def test_create_bang_should_raise_exception_when_join_record_has_errors
       end
     end
   end
+
+  def test_save_bang_should_raise_exception_when_join_record_has_errors
+    repair_validations(Categorization) do
+      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
+      c = Category.new(:name => 'Fishing', :authors => [Author.first])
+      assert_raises(ActiveRecord::RecordInvalid) do
+        c.save!
+      end
+    end
+  end
+
+  def test_create_bang_returns_falsy_when_join_record_has_errors
+    repair_validations(Categorization) do
+      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
+      c = Category.new(:name => 'Fishing', :authors => [Author.first])
+      assert !c.save
+    end
+  end
 end