def testSaveConfig():
cf = TEST_CONF
sd = ScaleDetection()
sd.x_scale = SCALE[0]
sd.y_scale = SCALE[1]
sd.units = UNIT
sd.saveConfigFile(config_file=cf)
with open(cf, 'r') as conf:
j = json.load(conf)
assert j["x_scale"] == sd.x_scale
assert j["y_scale"] == sd.y_scale
assert j["units"] == UNIT
