Add a way to add email to block list when nuking a user

spec/models/blocked_email_spec.rb

@@ -6,18 +6,48 @@ describe BlockedEmail do
 
   describe "new record" do
     it "sets a default action_type" do
-      BlockedEmail.create(email: email).action_type.should == BlockedEmail.actions[:block]
+      described_class.create(email: email).action_type.should == described_class.actions[:block]
     end
 
     it "last_match_at is null" do
       # If we manually load the table with some emails, we can see whether those emails
       # have ever been blocked by looking at last_match_at.
-      BlockedEmail.create(email: email).last_match_at.should be_nil
+      described_class.create(email: email).last_match_at.should be_nil
     end
   end
 
-  describe "#should_block?" do
-    subject { BlockedEmail.should_block?(email) }
+  describe '#block' do
+    context 'email is not being blocked' do
+      it 'creates a new record with default action of :block' do
+        record = described_class.block(email)
+        record.should_not be_new_record
+        record.email.should == email
+        record.action_type.should == described_class.actions[:block]
+      end
+
+      it 'lets action_type be overriden' do
+        record = described_class.block(email, action_type: described_class.actions[:do_nothing])
+        record.should_not be_new_record
+        record.email.should == email
+        record.action_type.should == described_class.actions[:do_nothing]
+      end
+    end
+
+    context 'email is already being blocked' do
+      let!(:existing) { Fabricate(:blocked_email, email: email) }
+
+      it "doesn't create a new record" do
+        expect { described_class.block(email) }.to_not change { described_class.count }
+      end
+
+      it "returns the existing record" do
+        described_class.block(email).should == existing
+      end
+    end
+  end
+
+  describe '#should_block?' do
+    subject { described_class.should_block?(email) }
 
     it "returns false if a record with the email doesn't exist" do
       subject.should be_false