remove emptyness test, it depends on the state of the machine running…

… the tests

cli/cli_test.go

@@ -25,7 +25,6 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"strings"
 	"testing"
 
 	"bou.ke/monkey"
@@ -544,10 +543,6 @@ board_manager:
 	err = ioutil.WriteFile(filepath.Join(currDataDir, "library_index.json"), []byte(`{ "libraries": [] }`), os.FileMode(0644))
 	require.NoError(t, err, "Writing empty json index file")
 
-	// Empty cores list
-	exitCode, _ := executeWithArgs("--config-file", configFile, "core", "list")
-	require.Zero(t, exitCode)
-
 	// Dump config with cmd-line specific file
 	exitCode, d := executeWithArgs("--config-file", configFile, "config", "dump")
 	require.Zero(t, exitCode)
@@ -556,11 +551,6 @@ board_manager:
 	// Update inexistent index
 	exitCode, _ = executeWithArgs("--config-file", configFile, "core", "update-index")
 	require.NotZero(t, exitCode)
-
-	// Empty cores list
-	exitCode, d = executeWithArgs("--config-file", configFile, "core", "list")
-	require.Zero(t, exitCode)
-	require.Empty(t, strings.TrimSpace(string(d)))
 }
 
 func TestCoreCommandsIntegration(t *testing.T) {
@@ -601,11 +591,6 @@ func TestCoreCommandsIntegration(t *testing.T) {
 	require.NotZero(t, exitCode)
 	require.Contains(t, string(d), "invalid item")
 
-	// Empty cores list
-	exitCode, d = executeWithArgs("core", "list")
-	require.Zero(t, exitCode)
-	require.Empty(t, strings.TrimSpace(string(d)))
-
 	// Install avr 1.6.16
 	exitCode, d = executeWithArgs("core", "install", "arduino:[email protected]")
 	require.Zero(t, exitCode)
@@ -671,9 +656,4 @@ func TestCoreCommandsIntegration(t *testing.T) {
 	exitCode, d = executeWithArgs("core", "uninstall", "arduino:avr")
 	require.Zero(t, exitCode)
 	require.Contains(t, string(d), AVR+" uninstalled")
-
-	// Empty cores list
-	exitCode, d = executeWithArgs("core", "list")
-	require.Zero(t, exitCode)
-	require.Empty(t, strings.TrimSpace(string(d)))
 }

cli/serial/serial.go

@@ -0,0 +1,34 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2019 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to modify or
+// otherwise use the software for commercial activities involving the Arduino
+// software without disclosing the source code of your own applications. To purchase
+// a commercial license, send an email to [email protected].
+
+package serial
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// InitCommand prepares the command.
+func InitCommand() *cobra.Command {
+	serialCommand := &cobra.Command{
+		Use:     "serial",
+		Short:   "Arduino CLI Serial Commands.",
+		Long:    "Arduino CLI Serial Commands.",
+		Example: "  " + os.Args[0] + " serial monitor /dev/tty0",
+	}
+
+	return serialCommand
+}