1 files changed, 54 insertions, 0 deletions
diff --git a/lib/release_highlights/validator.rb b/lib/release_highlights/validator.rb
new file mode 100644
index 00000000000..6f3f90b5f30
--- /dev/null
+++ b/lib/release_highlights/validator.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+module ReleaseHighlights
+  class Validator
+    attr_reader :errors, :file
+
+    def initialize(file:)
+      @file = file
+      @errors = []
+    end
+
+    def valid?
+      document = YAML.parse(File.read(file))
+
+      document.root.children.each do |entry|
+        entry = ReleaseHighlights::Validator::Entry.new(entry)
+
+        errors.push(entry.errors.full_messages) unless entry.valid?
+      end
+
+      errors.none?
+    end
+
+    def self.validate_all!
+      @all_errors = []
+
+      ReleaseHighlight.file_paths.each do |file_path|
+        instance = self.new(file: file_path)
+
+        @all_errors.push([instance.errors, instance.file]) unless instance.valid?
+      end
+
+      @all_errors.none?
+    end
+
+    def self.error_message
+      io = StringIO.new
+
+      @all_errors.each do |errors, file|
+        message = "Validation failed for #{file}"
+        line = -> { io.puts "-" * message.length }
+
+        line.call
+        io.puts message
+        line.call
+
+        errors.flatten.each { |error| io.puts "* #{error}" }
+        io.puts
+      end
+
+      io.string
+    end
+  end
+end