diff --git a/spec/models/comment_spec.rb b/spec/models/comment_spec.rb
index 490a5cfd1..8798f4935 100644
--- a/spec/models/comment_spec.rb
+++ b/spec/models/comment_spec.rb
@@ -36,4 +36,34 @@ describe Comment do
       expect(comment).to be_as_moderator
     end
   end
+
+  describe "cache" do
+    let(:comment) { create(:comment) }
+
+    it "should expire cache when it has a new vote" do
+      expect { create(:vote, votable: comment) }
+      .to change { comment.updated_at }
+    end
+
+    it "should expire cache when hidden" do
+      expect { comment.hide }
+      .to change { comment.updated_at }
+    end
+
+    it "should expire cache when the author is hidden" do
+      expect { comment.user.hide }
+      .to change { comment.reload.updated_at }
+    end
+
+    it "should expire cache when the author changes" do
+      expect { comment.user.update(username: "Isabel") }
+      .to change { comment.reload.updated_at }
+    end
+
+    it "should expire cache when the author's organization get verified" do
+      create(:organization, user: comment.user)
+      expect { comment.user.organization.verify }
+      .to change { comment.reload.updated_at}
+    end
+  end
 end
diff --git a/spec/models/debate_spec.rb b/spec/models/debate_spec.rb
index 25e878d18..951837956 100644
--- a/spec/models/debate_spec.rb
+++ b/spec/models/debate_spec.rb
@@ -268,4 +268,34 @@ describe Debate do
     end
   end
 
+  describe "cache" do
+    let(:debate) { create(:debate) }
+
+    it "should expire cache when it has a new comment" do
+      expect { create(:comment, commentable: debate) }
+      .to change { debate.updated_at }
+    end
+
+    it "should expire cache when it has a new vote" do
+      expect { create(:vote, votable: debate) }
+      .to change { debate.updated_at }
+    end
+
+    it "should expire cache when it has a new tag" do
+      expect { debate.update(tag_list: "new tag") }
+      .to change { debate.updated_at }
+    end
+
+    it "should expire cache when its author changes" do
+      expect { debate.author.update(username: "Eva") }
+      .to change { debate.reload.updated_at }
+    end
+
+    it "should expire cache when the author's organization get verified" do
+      create(:organization, user: debate.author)
+      expect { debate.author.organization.verify }
+      .to change { debate.reload.updated_at}
+    end
+  end
+
 end
\ No newline at end of file
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 282d8d615..f9c24ec4d 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -299,4 +299,25 @@ describe User do
     end
   end
 
+  describe "cache" do
+    let(:user) { create(:user) }
+
+    it "should expire cache with becoming a moderator" do
+      expect { create(:moderator, user: user) }
+      .to change { user.updated_at}
+    end
+
+    it "should expire cache with becoming an admin" do
+      expect { create(:administrator, user: user) }
+      .to change { user.updated_at}
+    end
+
+    it "should expire cache with becoming a veridied organization" do
+      create(:organization, user: user)
+      expect { user.organization.verify }
+      .to change { user.reload.updated_at}
+    end
+
+  end
+
 end