Allow exceptions and document it

Author: khiga8

docs/rules/accessibility/aria-label-is-well-formatted.md

@@ -0,0 +1,46 @@
+# aria-label is well formatted
+
+## Rule Details
+
+`[aria-label]` content should be formatted in the same way you would visual text. Please use sentence case.
+
+Do not connect the words like you would an ID. An `aria-label` is different from `aria-labelledby`.
+An `aria-label` is not an ID, and should be formatted as human-friendly text.
+
+## Config
+
+If you determine that there are valid scenarios for `aria-label` to start with downcase, you may except it in your `.erb-lint.yml` config like so:
+
+```yml
+  GitHub::Accessibility::AriaLabelIsWellFormatted:
+    enabled: true
+    exceptions:
+      - allowed for some reason
+      - also allowed for some reason
+```
+
+## Examples
+
+### **Incorrect** code for this rule 👎
+
+```erb
+<button aria-label="close">
+```
+
+```erb
+<button aria-label="submit">
+```
+
+```erb
+<button aria-label="button-1">
+```
+
+### **Correct** code for this rule  👍
+
+```erb
+<button aria-label="Submit">
+````
+
+```erb
+<button aria-label="Close">
+````

test/linters/accessibility/aria_label_is_well_formatted_test.rb

@@ -52,11 +52,11 @@ def test_does_not_warn_when_aria_label_is_excepted_in_config
   def test_does_not_warn_if_aria_label_is_in_excepted_list
     @file = <<~HTML
      <button aria-label="hello" ></button>
-
+     <button aria-label="hello world" ></button>
     HTML
     @linter.config.exceptions = ["hello"]
     @linter.run(processed_source)
 
-    assert_empty @linter.offenses
+    assert_equal 1, @linter.offenses.count
   end
 end