def METHOD_NAME(show_plots):
    testFailCount = 0                       # zero unit test result counter
    testMessages = []                       # create empty array to store test log messages
    unitTaskName = "unitTask"               # arbitrary name (don't change)
    unitProcessName = "TestProcess"         # arbitrary name (don't change)
    # Create a sim module as an empty container
    unitTestSim = SimulationBaseClass.SimBaseClass()
    # Create test thread
    testProcessRate = macros.sec2nano(0.5)     # update process rate update time
    testProc = unitTestSim.CreateNewProcess(unitProcessName)
    testProc.addTask(unitTestSim.CreateNewTask(unitTaskName, testProcessRate))
    # Construct algorithm and associated C++ container
    sunlineEphemObj = sunlineEphem.sunlineEphem()
    sunlineEphemObj.ModelTag = "sunlineEphem"           # update python name of test module
    # Add test module to runtime call list
    unitTestSim.AddModelToTask(unitTaskName, sunlineEphemObj)
    # Create input message and size it because the regular creator of that message
    # is not part of the test.
    vehAttData = messaging.NavAttMsgPayload()
    vehPosData = messaging.NavTransMsgPayload()
    sunData = messaging.EphemerisMsgPayload()
    # Artificially put sun at the origin.
    sunData.r_BdyZero_N = [0.0, 0.0, 0.0]
    vehAttInMsg = messaging.NavAttMsg().write(vehAttData)
    # Place spacecraft unit length away on each coordinate axis
    vehAttData.sigma_BN = [0.0, 0.0, 0.0]
    TestVectors = [[-1.0, 0.0, 0.0],
                   [0.0, -1.0, 0.0],
                   [0.0, 0.0, -1.0],
                   [1.0, 0.0, 0.0],
                   [0.0, 1.0, 0.0],
                   [0.0, 0.0, 1.0]]
    estVector = np.zeros((6, 3))
    vehPosInMsg = messaging.NavTransMsg()
    sunDataInMsg = messaging.EphemerisMsg().write(sunData)
    sunlineEphemObj.sunPositionInMsg.subscribeTo(sunDataInMsg)
    sunlineEphemObj.scPositionInMsg.subscribeTo(vehPosInMsg)
    sunlineEphemObj.scAttitudeInMsg.subscribeTo(vehAttInMsg)
    dataLog = sunlineEphemObj.navStateOutMsg.recorder()
    unitTestSim.AddModelToTask(unitTaskName, dataLog)
    for i in range(len(TestVectors)):
        testVec = TestVectors[i]
        vehPosData.r_BN_N = testVec
        vehPosInMsg.write(vehPosData)
        # Need to call the self-init and cross-init methods
        unitTestSim.InitializeSimulation()
        unitTestSim.ConfigureStopTime(macros.sec2nano(1.0))        # seconds to stop simulation
        unitTestSim.ExecuteSimulation()
        estVector[i] = dataLog.vehSunPntBdy[-1]
        # reset the module to test this functionality
        sunlineEphemObj.Reset(1)
    # set the filtered output truth states
    trueVector = [
               [1.0, 0.0, 0.0],
               [0.0, 1.0, 0.0],
               [0.0, 0.0, 1.0],
               [-1.0, 0.0, 0.0],
               [0.0, -1.0, 0.0],
                [0.0, 0.0, -1.0]
               ]
    # compare the module results to the truth values
    accuracy = 1e-12
    for i in range(0,len(trueVector)):
        # check a vector values
        if not unitTestSupport.isArrayEqual(estVector[i], trueVector[i], 3, accuracy):
            testFailCount += 1
            testMessages.append("FAILED: " + sunlineEphemObj.ModelTag + " Module failed sunlineEphem " +
                                " unit test at t=" + str(dataLog.times()[i]*macros.NANO2SEC) + "sec\n")
    #   print out success message if no error were found
    if testFailCount == 0:
        print("PASSED: " + sunlineEphemObj.ModelTag)
    else:
        print(testMessages)
    # each test method requires a single assert method to be called
    # this check below just makes sure no sub-test failures were found
    return [testFailCount, ''.join(testMessages)]