Don't add CHANGELOG offenses to "no changes" line

tools/rail_inspector/lib/rail_inspector/changelog.rb

@@ -36,6 +36,8 @@ def header
         end
 
         def validate_authors
+          return if no_changes?
+
           authors =
             lines.reverse.find { |line| line.match?(/\*[^\d\s]+(\s[^\d\s]+)*\*/) }
 
@@ -87,6 +89,10 @@ def validate_trailing_whitespace
         end
 
       private
+        def no_changes?
+          lines.first == "*   No changes."
+        end
+
         def add_offense(...)
           @offenses << Offense.new(...)
         end

tools/rail_inspector/test/fixtures/action_mailbox.md

@@ -0,0 +1,46 @@
+## Rails 7.1.0.rc1 (September 13, 2023) ##
+
+*   No changes.
+
+
+## Rails 7.1.0.beta1 (September 13, 2023) ##
+
+*   Fix `simple_format` with blank `wrapper_tag` option returns plain html tag
+
+    By default `simple_format` method returns the text wrapped with `<p>`. But if we explicitly specify
+    the `wrapper_tag: nil` in the options, it returns the text wrapped with `<></>` tag.
+
+    Before:
+
+    ```ruby
+    simple_format("Hello World", {},  { wrapper_tag: nil })
+    # <>Hello World</>
+    ```
+
+    After:
+
+    ```ruby
+    simple_format("Hello World", {},  { wrapper_tag: nil })
+    # <p>Hello World</p>
+    ```
+
+    *Akhil G Krishnan*, *Junichi Ito*
+
+*   Don't double-encode nested `field_id` and `field_name` index values
+
+    Pass `index: @options` as a default keyword argument to `field_id` and
+    `field_name` view helper methods.
+
+    *Sean Doyle*
+
+*   Allow opting in/out of `Link preload` headers when calling `stylesheet_link_tag` or `javascript_include_tag`
+
+    ```ruby
+    # will exclude header, even if setting is enabled:
+    javascript_include_tag("http://example.com/all.js", preload_links_header: false)
+
+    # will include header, even if setting is disabled:
+    stylesheet_link_tag("http://example.com/all.js", preload_links_header: true)
+    ```
+
+    *Alex Ghiculescu*

tools/rail_inspector/test/rail_inspector/changelog_test.rb

@@ -54,6 +54,12 @@ def test_release_header_is_not_treated_as_offense
     assert_equal 0, offenses.length
   end
 
+  def test_no_changes_not_treated_as_offense
+    @changelog = changelog_fixture("action_mailbox.md")
+
+    assert_equal 0, offenses.length
+  end
+
   def test_validate_authors
     assert_offense(<<~CHANGELOG)
       *   Fix issue in CHANGELOG linting