feat(GODT-2373): bridgelib tests.

pkg/bridgelib/bridgelib.go

@@ -106,3 +106,11 @@ func withLocationProvider(fn func(provider *locations.DefaultProvider) string) *
 
 	return C.CString(fn(locs))
 }
+
+// cStringToGoString converts a cString to a GoString and release the memory for the C-String. This function is implemented
+// here because cgo code is not allowed in Go test files.
+func cStringToGoString(cStr *C.char) string {
+	str := C.GoString(cStr)
+	DeleteCString(cStr) // preferred over a direct call to C.free so that the former is covered in tests.
+	return str
+}

pkg/bridgelib/bridgelib_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2023 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/ProtonMail/proton-bridge/v3/internal/constants"
+	"github.com/ProtonMail/proton-bridge/v3/internal/locations"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBridgelib(t *testing.T) {
+	locs, err := locations.NewDefaultProvider(filepath.Join(constants.VendorName, constants.ConfigName))
+	require.NoError(t, err)
+
+	require.Equal(t, cStringToGoString(GoOS()), runtime.GOOS)
+	require.Equal(t, cStringToGoString(UserCacheDir()), locs.UserCache())
+	require.Equal(t, cStringToGoString(UserConfigDir()), locs.UserConfig())
+	require.Equal(t, cStringToGoString(UserDataDir()), locs.UserData())
+}