core: add helper to create QCDM serial ports from a file descriptor

Aids in unit testing

src/mm-qcdm-serial-port.c

@@ -196,6 +196,23 @@ mm_qcdm_serial_port_new (const char *name, MMPortType ptype)
                                               NULL));
 }
 
+MMQcdmSerialPort *
+mm_qcdm_serial_port_new_fd (int fd, MMPortType ptype)
+{
+    MMQcdmSerialPort *port;
+    char *name;
+
+    name = g_strdup_printf ("port%d", fd);
+    port = MM_QCDM_SERIAL_PORT (g_object_new (MM_TYPE_QCDM_SERIAL_PORT,
+                                              MM_PORT_DEVICE, name,
+                                              MM_PORT_SUBSYS, MM_PORT_SUBSYS_TTY,
+                                              MM_PORT_TYPE, ptype,
+                                              MM_SERIAL_PORT_FD, fd,
+                                              NULL));
+    g_free (name);
+    return port;
+}
+
 static void
 mm_qcdm_serial_port_init (MMQcdmSerialPort *self)
 {

src/mm-qcdm-serial-port.h

@@ -50,6 +50,8 @@ GType mm_qcdm_serial_port_get_type (void);
 
 MMQcdmSerialPort *mm_qcdm_serial_port_new (const char *name, MMPortType ptype);
 
+MMQcdmSerialPort *mm_qcdm_serial_port_new_fd (int fd, MMPortType ptype);
+
 void     mm_qcdm_serial_port_queue_command     (MMQcdmSerialPort *self,
                                                 GByteArray *command,
                                                 guint32 timeout_seconds,