diff --git a/spec/models/block_spec.rb b/spec/models/block_spec.rb
index 84f0f318f..62d7e40e2 100644
--- a/spec/models/block_spec.rb
+++ b/spec/models/block_spec.rb
@@ -3,11 +3,37 @@
 require 'rails_helper'
 
 RSpec.describe Block do
-  describe 'validations' do
+  describe 'Associations' do
     it { is_expected.to belong_to(:account).required }
     it { is_expected.to belong_to(:target_account).required }
   end
 
+  describe '#local?' do
+    it { is_expected.to_not be_local }
+  end
+
+  describe 'Callbacks' do
+    describe 'Setting a URI' do
+      context 'when URI exists' do
+        subject { Fabricate.build :block, uri: 'https://uri/value' }
+
+        it 'does not change' do
+          expect { subject.save }
+            .to not_change(subject, :uri)
+        end
+      end
+
+      context 'when URI is blank' do
+        subject { Fabricate.build :follow, uri: nil }
+
+        it 'populates the value' do
+          expect { subject.save }
+            .to change(subject, :uri).to(be_present)
+        end
+      end
+    end
+  end
+
   it 'removes blocking cache after creation' do
     account = Fabricate(:account)
     target_account = Fabricate(:account)