print working directory in test output

Author: ianfixes

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 ### Added
+- Working directory is now printed in test runner output
 
 ### Changed
 - Update .gitattributes so we have consistent line endings

exe/arduino_ci.rb

@@ -502,6 +502,7 @@ def perform_example_compilation_tests(cpp_library, config)
 
 banner
 inform("Host OS") { ArduinoCI::Host.os }
+inform("Working directory") { Dir.pwd }
 
 # initialize command and config
 config = ArduinoCI::CIConfig.default.from_project_library