Merge pull request #17 from pocke/Add_test_for__IS_NULL__and__IS_NOT_…

…NULL_

Add test for `IS NULL` and `IS NOT NULL`

spec/activerecord/originator_spec.rb

@@ -17,7 +17,7 @@
       end
 
       it 'annotates != operator' do
-        expect(Post.not_eq.to_sql).to eq(<<~SQL)
+        expect(Post.not_eq('hello').to_sql).to eq(<<~SQL)
           SELECT "posts".* FROM "posts" WHERE "posts"."title" != 'hello' /* /spec/support/post.rb:9 */
         SQL
       end
@@ -51,6 +51,18 @@
           SELECT "posts".* FROM "posts" WHERE "posts"."id" < 42 /* /spec/support/post.rb:8 */
         SQL
       end
+
+      it 'annotates IS NULL operator' do
+        expect(Post.state_for(nil).to_sql).to eq(<<~SQL)
+          SELECT "posts".* FROM "posts" WHERE "posts"."state" IS NULL /* /spec/support/post.rb:6 */
+        SQL
+      end
+
+      it 'annotates IS NOT NULL operator' do
+        expect(Post.not_eq(nil).to_sql).to eq(<<~SQL)
+          SELECT "posts".* FROM "posts" WHERE "posts"."title" IS NOT NULL /* /spec/support/post.rb:9 */
+        SQL
+      end
     end
 
     it 'annotates a ORDER BY asc clause' do

spec/support/post.rb

@@ -6,6 +6,6 @@ class Post < ActiveRecord::Base
   scope :state_for, ->(state) { where(state: state) }
   scope :not_state_for, ->(state) { where.not(state: state) }
   scope :compare_id, ->(range) { where(id: range) }
-  scope :not_eq, -> { where.not(title: 'hello') }
+  scope :not_eq, ->(title) { where.not(title: title) }
   scope :order_by_title, ->(direction) { order(title: direction) }
 end