[skip changelog] Add unit test for lib install from git url

Author: silvanocerza

Diff for: arduino/libraries/librariesmanager/install.go

@@ -240,15 +240,17 @@ func (lm *LibrariesManager) InstallGitLib(gitURL string, overwrite bool) error {
 	return nil
 }
 
+// parseGitURL tries to recover a library name from a git URL.
+// Returns an error in case the URL is not a valid git URL.
 func parseGitURL(gitURL string) (string, error) {
 	var res string
 	if strings.HasPrefix(gitURL, "git@") {
 		// We can't parse these as URLs
 		i := strings.LastIndex(gitURL, "/")
 		res = strings.TrimSuffix(gitURL[i+1:], ".git")
-	} else if path := paths.New(gitURL); path.Exist() {
+	} else if path := paths.New(gitURL); path != nil && path.Exist() {
 		res = path.Base()
-	} else if parsed, err := url.Parse(gitURL); err == nil {
+	} else if parsed, err := url.Parse(gitURL); parsed.String() != "" && err == nil {
 		i := strings.LastIndex(parsed.Path, "/")
 		res = strings.TrimSuffix(parsed.Path[i+1:], ".git")
 	} else {

Diff for: arduino/libraries/librariesmanager/install_test.go

@@ -0,0 +1,64 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 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 librariesmanager
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseGitURL(t *testing.T) {
+	gitURL := ""
+	libraryName, err := parseGitURL(gitURL)
+	require.Equal(t, "", libraryName)
+	require.Errorf(t, err, "invalid git url")
+
+	gitURL = "https://github.com/arduino/arduino-lib.git"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "[email protected]:arduino/arduino-lib.git"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "file:///path/to/arduino-lib"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "file:///path/to/arduino-lib.git"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "/path/to/arduino-lib"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "/path/to/arduino-lib.git"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+
+	gitURL = "file:///path/to/arduino-lib"
+	libraryName, err = parseGitURL(gitURL)
+	require.Equal(t, "arduino-lib", libraryName)
+	require.NoError(t, err)
+}