add equal operator

spec/models/logic/eq_spec.rb

@@ -0,0 +1,17 @@
+describe Logic::Eq do
+  include Logic
+
+  describe '#compute' do
+    it { expect(ds_eq(constant(1), constant(1)).compute).to be(true) }
+    it { expect(ds_eq(constant(1), constant(2)).compute).to be(false) }
+  end
+
+  describe '#errors' do
+    it { expect(ds_eq(constant(true), constant(true)).errors).to be_empty }
+    it { expect(ds_eq(constant(true), constant(1)).errors).to eq(["les types sont incompatibles : (true == 1)"]) }
+  end
+
+  describe '#==' do
+    it { expect(ds_eq(constant(true), constant(false))).to eq(ds_eq(constant(false), constant(true))) }
+  end
+end