trezor: add basic "-init -trezor" test

Verify that the Trezor feature flag is set after "-init -trezor".

tests/trezor/trezor_test.go

@@ -0,0 +1,44 @@
+package trezor
+
+// Test operations with "-trezor".
+// See also the "cli" package - the tests there are very similar.
+
+import (
+	"os/exec"
+	"runtime"
+	"testing"
+
+	"github.com/rfjakob/gocryptfs/internal/configfile"
+
+	"github.com/rfjakob/gocryptfs/tests/test_helpers"
+)
+
+func isTrezorConnected() bool {
+	if runtime.GOOS != "linux" {
+		return false
+	}
+	c := exec.Command("lsusb", "-d", "534c:0001")
+	err := c.Run()
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+// Test -init with -trezor
+func TestInitTrezor(t *testing.T) {
+	if !isTrezorConnected() {
+		t.Skip("No Trezor device connected")
+	}
+	t.Log("Trying gocryptfs -init -trezor ...")
+	//                                        vvvvvvvvvvvvv disable -extpass
+	dir := test_helpers.InitFS(t, "-trezor", "-extpass", "")
+	// The freshly created config file should have the Trezor feature flag set.
+	_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfDefaultName, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !c.IsFeatureFlagSet(configfile.FlagTrezor) {
+		t.Error("Trezor flag should be set but is not")
+	}
+}