feat(conditional): add exclude operator

spec/models/logic/exclude_operator_spec.rb

@@ -0,0 +1,29 @@
+describe Logic::ExcludeOperator do
+  include Logic
+
+  let(:champ) { create(:champ_multiple_drop_down_list, value: '["val1", "val2"]') }
+
+  describe '#compute' do
+    it { expect(ds_exclude(champ_value(champ.stable_id), constant('val1')).compute([champ])).to be(false) }
+    it { expect(ds_exclude(champ_value(champ.stable_id), constant('something else')).compute([champ])).to be(true) }
+  end
+
+  describe '#errors' do
+    it { expect(ds_exclude(champ_value(champ.stable_id), constant('val1')).errors([champ.type_de_champ])).to be_empty }
+    it do
+      expected = {
+        right: constant('something else'),
+        stable_id: champ.stable_id,
+        type: :not_included
+      }
+
+      expect(ds_exclude(champ_value(champ.stable_id), constant('something else')).errors([champ.type_de_champ])).to eq([expected])
+    end
+
+    it { expect(ds_exclude(constant(1), constant('val1')).errors([])).to eq([{ type: :required_list }]) }
+  end
+
+  describe '#==' do
+    it { expect(ds_include(champ_value(champ.stable_id), constant('val1'))).to eq(ds_include(champ_value(champ.stable_id), constant('val1'))) }
+  end
+end