tests/test_fwenv: check if we can read uboot environment

tests/test_fwenv.py

+"""This checks that we have correctly configured access to uboot environment using uboot-tools.
+"""
+import pytest
+
+
+def test_fw_printenv(client_board):
+    """Check that we can access uboot environment.
+    """
+    client_board.run("fw_printenv")
+    assert "Warning: Bad CRC, using default environment" not in client_board.output