Set test environment directory as CLI WorkingDir

By default, the working directory is the one containing the test.go file. This causes problems when executing commands that have to create files specifically in the working directory, because they either must be deleted manually or the user has to be aware of it and defer a deleting instruction. Furthermore, it messes with tests using relative paths.
Setting the environment directory as the CLI's WorkingDir prevents the above mentioned issues from occurring.

Author: MatteoPologruto

internal/integrationtest/arduino-cli.go

@@ -43,7 +43,8 @@ func init() {
 
 // FindRepositoryRootPath returns the repository root path
 func FindRepositoryRootPath(t *testing.T) *paths.Path {
-	repoRootPath := paths.New(".")
+	repoRootPath, err := paths.Getwd()
+	require.NoError(t, err)
 	require.NoError(t, repoRootPath.ToAbs())
 	for !repoRootPath.Join(".git").Exist() {
 		require.Contains(t, repoRootPath.String(), "arduino-cli", "Error searching for repository root path")
@@ -75,6 +76,7 @@ type ArduinoCLI struct {
 	stagingDir           *paths.Path
 	dataDir              *paths.Path
 	sketchbookDir        *paths.Path
+	workingDir           *paths.Path
 	daemonAddr           string
 	daemonConn           *grpc.ClientConn
 	daemonClient         commands.ArduinoCoreServiceClient
@@ -96,6 +98,7 @@ func NewArduinoCliWithinEnvironment(env *testsuite.Environment, config *ArduinoC
 		dataDir:       env.RootDir().Join("A"),
 		sketchbookDir: env.RootDir().Join("Arduino"),
 		stagingDir:    env.RootDir().Join("Arduino15/staging"),
+		workingDir:    env.RootDir(),
 	}
 	if config.UseSharedStagingFolder {
 		cli.stagingDir = env.SharedDownloadsDir()
@@ -130,6 +133,11 @@ func (cli *ArduinoCLI) SketchbookDir() *paths.Path {
 	return cli.sketchbookDir
 }
 
+// WorkingDir returns the working directory
+func (cli *ArduinoCLI) WorkingDir() *paths.Path {
+	return cli.workingDir
+}
+
 // CopySketch copies a sketch inside the testing environment and returns its path
 func (cli *ArduinoCLI) CopySketch(sketchName string) *paths.Path {
 	p, err := paths.Getwd()
@@ -180,6 +188,7 @@ func (cli *ArduinoCLI) RunWithCustomEnv(env map[string]string, args ...string) (
 	cli.t.NoError(err)
 	_, err = cliProc.StdinPipe()
 	cli.t.NoError(err)
+	cliProc.SetDir(cli.WorkingDir().String())
 
 	cli.t.NoError(cliProc.Start())