diff --git a/lib/chusaku.rb b/lib/chusaku.rb
index 43d1c6e..1271b29 100644
--- a/lib/chusaku.rb
+++ b/lib/chusaku.rb
@@ -19,6 +19,7 @@ def call(flags = {})
       @flags = flags
       @routes = Chusaku::Routes.call
       @changes = []
+      @changed_files = []
       controllers_pattern = "app/controllers/**/*_controller.rb"
 
       Dir.glob(Rails.root.join(controllers_pattern)).each do |path|
@@ -141,6 +142,7 @@ def write_to_file(path:, parsed_file:)
       return if parsed_file[:content] == new_content
 
       !@flags.include?(:dry) && perform_write(path: path, content: new_content)
+      @changed_files.push(path)
     end
 
     # Extracts the new file content for the given parsed file.
@@ -181,7 +183,7 @@ def file_mode
     def output_results
       puts(output_copy)
       exit_code = 0
-      exit_code = 1 if @changes.any? && @flags.include?(:error_on_annotation)
+      exit_code = 1 if @changed_files.any? && @flags.include?(:error_on_annotation)
       exit_code
     end
 
@@ -189,7 +191,7 @@ def output_results
     #
     # @return [String] Copy to be outputted to user
     def output_copy
-      return "Nothing to annotate." if @changes.empty?
+      return "Nothing to annotate." if @changed_files.empty?
 
       copy = changes_copy
       copy += "\nChusaku has finished running."
diff --git a/test/chusaku_test.rb b/test/chusaku_test.rb
index d0189cf..24a076f 100644
--- a/test/chusaku_test.rb
+++ b/test/chusaku_test.rb
@@ -2,7 +2,6 @@
 
 class ChusakuTest < Minitest::Test
   def test_dry_run_flag
-    File.reset_mock
     exit_code = 0
 
     out, _err = capture_io { exit_code = Chusaku.call(dry: true) }
@@ -13,7 +12,6 @@ def test_dry_run_flag
   end
 
   def test_exit_with_error_on_annotation_flag
-    File.reset_mock
     exit_code = 0
 
     out, _err = capture_io { exit_code = Chusaku.call(error_on_annotation: true) }
@@ -24,7 +22,6 @@ def test_exit_with_error_on_annotation_flag
   end
 
   def test_dry_run_and_exit_with_error_flag
-    File.reset_mock
     exit_code = 0
 
     out, _err = capture_io { exit_code = Chusaku.call(dry: true, error_on_annotation: true) }
@@ -36,7 +33,6 @@ def test_dry_run_and_exit_with_error_flag
   end
 
   def test_verbose_flag
-    File.reset_mock
     exit_code = 0
 
     out, _err = capture_io { exit_code = Chusaku.call(verbose: true) }
@@ -62,7 +58,6 @@ def show
   end
 
   def test_mock_app
-    File.reset_mock
     exit_code = 0
 
     capture_io { exit_code = Chusaku.call }
@@ -125,4 +120,15 @@ def one_off
       HEREDOC
     assert_equal(expected, files["#{base_path}/waterlilies_controller.rb"])
   end
+
+  def test_mock_app_with_no_pending_annotations
+    Rails.set_route_allowlist(["api/burritos#create"])
+    exit_code = 0
+
+    out, _err = capture_io { exit_code = Chusaku.call }
+
+    assert_equal(0, exit_code)
+    assert_empty(File.written_files)
+    assert_equal("Nothing to annotate.\n", out)
+  end
 end
diff --git a/test/mock/rails.rb b/test/mock/rails.rb
index e1c9cab..4c461a3 100644
--- a/test/mock/rails.rb
+++ b/test/mock/rails.rb
@@ -87,12 +87,20 @@ def application
 
       app = Minitest::Mock.new
       app_routes = Minitest::Mock.new
-      app_routes.expect(:routes, routes)
+      app_routes.expect(:routes, routes.compact)
       app.expect(:routes, app_routes)
       app
     end
 
-    # Lets us call `Rails.root` without an skeleton Rails app.
+    # Define an allowlist of controller/actions that will be mocked.
+    #
+    # @param route_allowlist [Array<String>] In format "controller#action"
+    # @return [void]
+    def set_route_allowlist(route_allowlist)
+      @@route_allowlist = route_allowlist
+    end
+
+    # Lets us call `Rails.root` without a skeleton Rails app.
     #
     # @return [Minitest::Mock] Mocked `Rails.root`
     def root
@@ -114,9 +122,11 @@ def root
     # @param path [String] Mocked Rails path
     # @param name [String] Mocked route name
     # @param defaults [Hash] Mocked default params
-    # @return [Minitest::Mock] Mocked route
-    #
+    # @return [Minitest::Mock, nil] Mocked route
     def mock_route(controller:, action:, verb:, path:, name:, defaults: {})
+      @@route_allowlist ||= []
+      return if @@route_allowlist.any? && @@route_allowlist.index("#{controller}##{action}").nil?
+
       route = Minitest::Mock.new
       route.expect(:defaults, controller: controller, action: action, **defaults)
       route.expect(:verb, verb)
diff --git a/test/test_helper.rb b/test/test_helper.rb
index c97b8b2..05cebc1 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -4,3 +4,16 @@
 require_relative "mock/file"
 require "chusaku/cli"
 require "minitest/autorun"
+
+module ChusakuTestPlugin
+  def before_setup
+    super
+
+    File.reset_mock
+    Rails.set_route_allowlist([])
+  end
+end
+
+class Minitest::Test
+  include ChusakuTestPlugin
+end