Use let and let! in message

Also, removed redundant "block" from the message.

Author: bquorning

lib/rubocop/cop/rspec/empty_line_after_final_let.rb

@@ -20,7 +20,7 @@ class EmptyLineAfterFinalLet < Cop
         extend AutoCorrector
         include RuboCop::RSpec::BlankLineSeparation
 
-        MSG = 'Add an empty line after the last `let` block.'
+        MSG = 'Add an empty line after the last `%<let>s`.'
 
         def on_block(node)
           return unless example_group_with_body?(node)
@@ -31,7 +31,8 @@ def on_block(node)
           return if last_child?(latest_let)
 
           missing_separating_line(latest_let) do |location|
-            add_offense(location) do |corrector|
+            msg = format(MSG, let: latest_let.method_name)
+            add_offense(location, message: msg) do |corrector|
               corrector.insert_after(location.end, "\n")
             end
           end

spec/rubocop/cop/rspec/empty_line_after_final_let_spec.rb

@@ -8,7 +8,7 @@
       RSpec.describe User do
         let(:a) { a }
         let(:b) { b }
-        ^^^^^^^^^^^^^ Add an empty line after the last `let` block.
+        ^^^^^^^^^^^^^ Add an empty line after the last `let`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -30,7 +30,7 @@
         let!(:b) do
           b
         end
-        ^^^ Add an empty line after the last `let` block.
+        ^^^ Add an empty line after the last `let!`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -52,7 +52,7 @@
       RSpec.describe User do
         let(:a) { a }
         let(:user, &args[:build_user])
-        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add an empty line after the last `let` block.
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Add an empty line after the last `let`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -96,7 +96,7 @@
         let(:a) { a }
         let(:b) { b }
         # end of setup
-        ^^^^^^^^^^^^^^ Add an empty line after the last `let` block.
+        ^^^^^^^^^^^^^^ Add an empty line after the last `let`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -119,7 +119,7 @@
         let(:b) { b }
         # a multiline comment marking
         # the end of setup
-        ^^^^^^^^^^^^^^^^^^ Add an empty line after the last `let` block.
+        ^^^^^^^^^^^^^^^^^^ Add an empty line after the last `let`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -144,7 +144,7 @@
         subject { described_class }
 
         let!(:b) { b }
-        ^^^^^^^^^^^^^^ Add an empty line after the last `let` block.
+        ^^^^^^^^^^^^^^ Add an empty line after the last `let!`.
         it { expect(a).to eq(b) }
       end
     RUBY
@@ -236,7 +236,7 @@
         hello
         world
         BAR
-        ^^^ Add an empty line after the last `let` block.
+        ^^^ Add an empty line after the last `let`.
         it 'has tricky syntax' do
           expect(foo).to eql("  hello\n  world\n")
         end