add test for the board-is-installed function

Author: ianfixes

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - `ArduinoInstallation` class for managing lib / executable paths
 - `DisplayManager` class for managing Xvfb instance if needed
+- `ArduinoCmd` can report on whether a board is installed
 
 ### Changed
 - `DisplayManger.with_display` doesn't `disable` if the display was enabled prior to starting the block

spec/arduino_cmd_spec.rb

@@ -13,5 +13,16 @@
       expect(arduino_cmd.installation.cmd_path).not_to be nil
     end
   end
-end
 
+  context "board_installed?" do
+    arduino_cmd = ArduinoCI::ArduinoCmd.autolocate!
+    ArduinoCI::DisplayManager::instance.enable
+    it "Finds installed boards" do
+      expect(arduino_cmd.board_installed? "arduino:avr:uno").to be true
+    end
+
+    it "Doesn't find bogus boards" do
+      expect(arduino_cmd.board_installed? "eggs:milk:wheat").to be false
+    end
+  end
+end