Fix false negatives during CI build (#102)

The previous configuration would only fail if the last compilation of one of the list items failed. Failure of any of the prior compilations in the list item would be masked by a successful final compilation.

Author: per1234

Diff for: .travis.yml

@@ -59,35 +59,47 @@ before_install:
   - installLibrary arduino-libraries/Ethernet
   - installLibrary arduino-libraries/Arduino_ConnectionHandler
   - installLibrary arduino-libraries/Arduino_DebugUtils
-  - buildExampleSketch() { arduino-cli compile --warnings all --fqbn $BOARD $PWD/examples/$1; }
-  - buildExampleUtilitySketch() { arduino-cli compile --warnings all --fqbn $BOARD $PWD/examples/utility/$1; }
+  - |
+    buildSketch() {
+      local exitStatus=0
+      local example
+      for example in "$@"; do
+        arduino-cli compile --warnings all --fqbn "$BOARD" "${TRAVIS_BUILD_DIR}/examples/${example}" || {
+          exitStatus=$?
+        }
+      done
+      return $exitStatus
+    }
 install:
   - mkdir -p $HOME/Arduino/libraries
   - ln -s $PWD $HOME/Arduino/libraries/.
 script:
   - |
     if [ "$BOARD" == "arduino:samd:mkr1000" ] || [ "$BOARD" == "arduino:samd:mkrwifi1010" ] || [ "$BOARD" == "arduino:samd:mkrgsm1400" ]; then
-      buildExampleSketch ArduinoIoTCloud_LED_switch;
-      buildExampleSketch ArduinoIoTCloud_Travis_CI;
-      buildExampleUtilitySketch Provisioning;
+      buildSketch \
+        "ArduinoIoTCloud_LED_switch" \
+        "ArduinoIoTCloud_Travis_CI" \
+        "utility/Provisioning"
     fi
   - |
     if [ "$BOARD" == "arduino:samd:mkrwan1300" ]; then
-      buildExampleSketch ArduinoIoTCloud_LED_switch;
-      buildExampleSketch ArduinoIoTCloud_Travis_CI;
+      buildSketch \
+        "ArduinoIoTCloud_LED_switch" \
+        "ArduinoIoTCloud_Travis_CI"
     fi
   - |
     if [ "$BOARD" == "arduino:samd:mkr1000" ] || [ "$BOARD" == "arduino:samd:mkrwifi1010" ]; then
-      buildExampleSketch WiFi_Cloud_Blink;
-      buildExampleSketch MultiValue_example;
+      buildSketch \
+        "WiFi_Cloud_Blink" \
+        "MultiValue_example"
     fi
   - |
     if [ "$BOARD" == "arduino:samd:mkrgsm1400" ]; then
-      buildExampleSketch GSM_Cloud_Blink;
+      buildSketch "GSM_Cloud_Blink"
     fi
   - |
     if [ "$BOARD" == "esp8266:esp8266:huzzah" ]; then
-      buildExampleSketch ArduinoIoTCloud_ESP8266;
+      buildSketch "ArduinoIoTCloud_ESP8266"
     fi
 notifications:
   webhooks: