Run tests [files] alphabetically

Author: ianfixes

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
 ### Changed
+- Unit tests and examples are now executed alphabetically by filename
 
 ### Deprecated
 

lib/arduino_ci/arduino_cmd.rb

@@ -319,7 +319,7 @@ def library_examples(installed_library_path)
         proj_file = example_path + e + "#{e}.ino"
         proj_file.exist? ? proj_file.to_s : nil
       end
-      files.reject(&:nil?)
+      files.reject(&:nil?).sort_by(&:to_s)
     end
   end
 end

lib/arduino_ci/cpp_library.rb

@@ -109,7 +109,8 @@ def cpp_files_in(some_dir)
       real = some_dir.realpath
       files = Find.find(real).map { |p| Pathname.new(p) }.reject(&:directory?)
       cpp = files.select { |path| CPP_EXTENSIONS.include?(path.extname.downcase) }
-      cpp.reject { |path| path.basename.to_s.start_with?(".") } # ignore hidden
+      not_hidden = cpp.reject { |path| path.basename.to_s.start_with?(".") }
+      not_hidden.sort_by(&:to_s)
     end
 
     # CPP files that are part of the project library under test