Add model tests for `Answer`

spec/models/answer_spec.rb

@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Answer, type: :model do
+  describe "associations" do
+    it { should belong_to(:user) }
+    it { should belong_to(:question) }
+    it { should have_many(:comments).dependent(:destroy) }
+    it { should have_many(:smiles).dependent(:destroy) }
+  end
+
+  describe "after_create" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:question_author) { FactoryBot.create(:user) }
+    let(:question) { FactoryBot.create(:question, user: question_author, author_is_anonymous: false) }
+
+    before do
+      subject.content = "Answer text"
+      subject.user = user
+      subject.question = question
+    end
+
+    context "user has the question in their inbox" do
+      before do
+        Inbox.create(user: user, question: question, new: true)
+      end
+
+      it "should remove the question from the user's inbox" do
+        expect { subject.save }.to change { user.inboxes.count }.by(-1)
+      end
+    end
+
+    it "should notify the question's author" do
+      expect { subject.save }.to change { question_author.notifications.count }.by(1)
+    end
+
+    it "should subscribe the answer's author to notifications for this answer" do
+      expect { subject.save }.to change { user.subscriptions.count }.by(1)
+      expect(user.subscriptions.first.answer).to eq(subject)
+    end
+
+    it "should subscribe the question's author to notifications for this answer" do
+      expect { subject.save }.to change { question_author.subscriptions.count }.by(1)
+    end
+
+    it "should increment the user's answered_count" do
+      expect { subject.save }.to change { user.answered_count }.by(1)
+    end
+
+    it "should increment the question's answer_count" do
+      expect { subject.save }.to change { question.answer_count }.by(1)
+    end
+  end
+
+  describe "before_destroy" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:question_author) { FactoryBot.create(:user) }
+    let(:question) { FactoryBot.create(:question, user: question_author, author_is_anonymous: false) }
+
+    before do
+      subject.content = "Answer text"
+      subject.user = user
+      subject.question = question
+      subject.save
+    end
+
+    context "question author has a notification for the answer" do
+      before do
+        Notification.notify(question_author, subject)
+      end
+
+      it "should remove the answered notification from the question's author" do
+        expect { subject.destroy }.to change { question_author.notifications.count }.by(-1)
+      end
+    end
+
+    it "should unsubscribe the answer's author from notifications for this answer" do
+      expect { subject.destroy }.to change { user.subscriptions.count }.by(-1)
+    end
+
+    it "should unsubscribe the question's author from notifications for this answer" do
+      expect { subject.destroy }.to change { question_author.subscriptions.count }.by(-1)
+    end
+
+    it "should decrement the user's answered_count" do
+      expect { subject.destroy }.to change { user.answered_count }.by(-1)
+    end
+
+    it "should decrement the question's answer_count" do
+      expect { subject.destroy }.to change { question.answer_count }.by(-1)
+    end
+  end
+end