Merge pull request #2425 from dgageot/pro-tip

B2D_CACHE can be used to speedup integration tests

test/integration/run-bats.sh

@@ -97,9 +97,13 @@ export -f machine
 cleanup_machines
 cleanup_store
 
-if [[ "$B2D_CACHE" == "1" ]] && [[ -f $B2D_LOCATION ]]; then
+if [[ -f "$B2D_LOCATION" ]]; then
+    if [[ "$B2D_CACHE" == "1" ]]; then
         mkdir -p "${MACHINE_STORAGE_PATH}/cache"
         cp $B2D_LOCATION "${MACHINE_STORAGE_PATH}/cache/boot2docker.iso"
+    else
+        echo "INFO: Run the tests with B2D_CACHE=1 to avoid downloading the boot2docker iso each time."
+    fi
 fi
 
 run_bats "$BATS_FILE"