In this week\'s team sprint assignment I need to complete two tasks (tasks 3 and

Question

In this week's team sprint assignment I need to complete two tasks (tasks 3 and 4 below). We need to add code to an existing unit test to set the input parameters for the function to be tested, and set the expected variable(s) for the value to be returned. The code is already there to compare your expected value to the actual value returned by the function being tested. The code to load the array values for Hubs has been moved into its own function so that the unit tests will work correctly and to pave the way for next week's sprint. If you get stuck modifying your own unit test, you may want to look at the unit test, ValueOfTest1, for inspiration, since this unit test has been completed for you. Notice that the call to the Assert.Inconclusive method has been commented out.Story: As a system administrator, I want a unit testing framework for easier testing and independence when writing code. My tasks are relatively simple, but I'm having trouble writing the code correctly.

Task 3:          Add a unit test for the CoordinateToDegrees function to assure that coordinates are transformed to decimal degrees correctly.

Task 3a:         Right click anywhere within the CoordinateToDegrees function in Airports.vb and add a unit test named CoordinateToDegreesTest to the unit test framework. (This has been done for you.)

Task3b: Modify the code in CoordinateToDegreesTest to assert that

DegreeString = "33° 38' 22"" N" and set the expected value to 33.63944.

You will need to set delta, the third parameter of the assert.equal function, to .00001 to allow for rounding error.

Task 3c: Run the unit tests to make sure they all pass.

Task 3d:         Check out the master copy of the project and install your changes.

Task 4:          Add a unit test for the DegreesToRadians function to assure that coordinates are transformed to radians correctly.

Task 4a:         Right click anywhere within the CoordinateToDegrees function in Airports.vb and add a unit test named DegreesToRadiansTest to the unit test framework. (This has been done for you.)

Task4b: Modify the code in DegreesToRadiansTest to assert that DegreesDouble = 33.63944

and set the expected value to 0.58712. You will need to set delta, the third parameter of the assert.equal function, to .00001 to allow for rounding error.

Task 4c: Run the unit tests to make sure they all pass.

Task 4d:         Check out the master copy of the project and install your changes.

This is our project code so far...

Test Code:

'''<summary>

'''This is a test class for AirportsTest and is intended

'''to contain all AirportsTest Unit Tests

'''</summary>

<TestClass()> _

Public Class AirportsTest

   Private testContextInstance As TestContext

   '''<summary>

   '''Gets or sets the test context which provides

   '''information about and functionality for the current test run.

   '''</summary>

   Public Property TestContext() As TestContext

       Get

           Return testContextInstance

       End Get

       Set(ByVal value As TestContext)

           testContextInstance = Value

       End Set

   End Property

#Region "Additional test attributes"

   '

   'You can use the following additional attributes as we write tests:

   '

   'Use ClassInitialize to run code before running the first test in the class

   '<ClassInitialize()> _

   '

   'Public Shared Sub MyClassInitialize(ByVal testContext As TestContext)

   'End Sub

   '

   'Use ClassCleanup to run code after all tests in a class have run

   '<ClassCleanup()> _

   'Public Shared Sub MyClassCleanup()

   'End Sub

   '

   'Use TestInitialize to run code before running each test

   '<TestInitialize()> _

   'Public Sub MyTestInitialize()

   'End Sub

   '

   'Use TestCleanup to run code after each test has run

   '<TestCleanup()> _

   'Public Sub MyTestCleanup()

   'End Sub

   '

#End Region

   '''<summary>

   '''A test for CoordinateToDegrees

   '''</summary>

   <TestMethod()> _

   Public Sub CoordinateToDegreesTest()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim DegreeString As String = String.Empty ' TODO: Initialize to an appropriate value

       Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim actual As Double

       actual = target.CoordinateToDegrees(DegreeString)

       Assert.AreEqual(expected, actual, delta)

       Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

   '''<summary>

   '''A test for DegreesToRadians

   '''</summary>

   <TestMethod()> _

   Public Sub DegreesToRadiansTest()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim DegreesDouble As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim actual As Double

       actual = target.DegreesToRadians(DegreesDouble)

       Assert.AreEqual(expected, actual, delta)

       Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

   '''<summary>

   '''A test for Distance

   '''</summary>

   <TestMethod()> _

   Public Sub DistanceTest()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim Index1 As Integer = 0 ' TODO: Initialize to an appropriate value

       Dim Index2 As Integer = 0 ' TODO: Initialize to an appropriate value

       Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value

       Dim actual As Double

       actual = target.Distance(Index1, Index2)

       Assert.AreEqual(expected, actual, delta)

       Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

   '''<summary>

   '''A test for ValueOf (City)

   '''</summary>

   <TestMethod()> _

   Public Sub ValueOfTest1()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value

       Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value

       Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value

       Dim actual As String

       target.LoadData()

       Index = 0

       FieldName = Airports.FieldNames.City

       expected = "Atlanta"

       actual = target.ValueOf(Index, FieldName)

       Assert.AreEqual(expected, actual)

       'Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

   '''<summary>

   '''A test for ValueOf (Latitude)

   '''</summary>

   <TestMethod()> _

   Public Sub ValueOfTest2()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value

       Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value

       Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value

       Dim actual As String

       target.LoadData()

       Debug.Assert(Index = 0)

       Debug.Assert(FieldName = Airports.FieldNames.Lat)

       actual = target.ValueOf(Index, FieldName)

       Assert.AreEqual(expected, actual)

       Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

   '''<summary>

   '''A test for ValueOf (Longitude)

   '''</summary>

   <TestMethod()> _

   Public Sub ValueOfTest3()

       Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value

       Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value

       Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value

       Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value

       Dim actual As String

       actual = target.ValueOf(Index, FieldName)

       Assert.AreEqual(expected, actual)

       Assert.Inconclusive("Verify the correctness of this test method.")

   End Sub

End Class

Main Form Code:

Option Strict On

Option Explicit On

Imports System.Math

Public Class Airports

   Public Enum FieldNames

       ID = 0

       City = 1

       Lat = 2

       Lon = 3

   End Enum

   Structure Airport 'Record

       Dim ID As String

       Dim City As String

       Dim Lat As String

       Dim Lon As String

   End Structure

   'Internal variables for current Airport records

   Dim Index1Integer As Integer

   Dim Lat1Double As Double

   Dim Lon1Double As Double

   Dim Index2Integer As Integer

   Dim Lat2Double As Double

   Dim Lon2Double As Double

   'Array of all Airport records

   Dim Hubs(3) As Airport

   Private Sub Form1_Load(ByVal sender As Object, _

              ByVal e As System.EventArgs) Handles Me.Load

       LoadData()

   End Sub

   Public Sub LoadData()

       '  The following code was moved from the Me.Load Event Handler

       '  for use in unit testing

       'Load small sample of airport hubs into Hubs array

       Hubs(0).ID = "ATL"

       Hubs(0).City = "Atlanta"

       Hubs(0).Lat = "33° 38' 22"" N"

       Hubs(0).Lon = "84° 25' 41"" W"

       Hubs(1).ID = "BOS"

       Hubs(1).City = "Boston"

       Hubs(1).Lat = "42° 21' 42"" N"

       Hubs(1).Lon = "71° 0' 42"" W"

       Hubs(2).ID = "CLE"

       Hubs(2).City = "Cleveland"

       Hubs(2).Lat = "41° 24' 27"" N"

       Hubs(2).Lon = "81° 51' 4"" W"

       Hubs(3).ID = "SEA"

       Hubs(3).City = "Seattle"

       Hubs(3).Lat = "47° 26' 56"" N"

       Hubs(3).Lon = "122° 18' 33"" W"

       'Load ID1ComboBox List

       For IndexInteger As Integer = 0 To 2

           ID1ComboBox.Items.Add(Hubs(IndexInteger).ID)

       Next

       'Load ID2ComboBox List

       For IndexInteger As Integer = 0 To 2

           ID2ComboBox.Items.Add(Hubs(IndexInteger).ID)

       Next

       'Set default values for Combo boxes

       ID1ComboBox.SelectedIndex = 0

       ID2ComboBox.SelectedIndex = 1

   End Sub

   Public Function CoordinateToDegrees(ByVal DegreeString As String) As Double

       '  Converts a coordinate string in degree/minute/second notation to decimal degrees.

       Dim degrees As Double

       Dim minutes As Double

       Dim seconds As Double

       Dim StartPtr, StopPtr As Integer

       StartPtr = 0

       StopPtr = DegreeString.IndexOf("°", StartPtr)

       degrees = Convert.ToDouble(DegreeString.Substring(StartPtr, StopPtr - StartPtr))

       StartPtr = StopPtr + 1

       StopPtr = DegreeString.IndexOf("'", StartPtr)

       minutes = Convert.ToDouble(DegreeString.Substring(StartPtr, StopPtr - StartPtr))

       StartPtr = StopPtr + 1

       StopPtr = DegreeString.IndexOf("""", StartPtr)

       seconds = Convert.ToDouble(DegreeString.Substring(StartPtr, StopPtr - StartPtr))

       '1 degree = 60 minutes = 3600 seconds

       '1 minute = 60 seconds

       Return degrees + minutes / 60.0 + seconds / 3600.0

   End Function

   Function DegreesToRadians(ByVal DegreesDouble As Double) As Double

       '  converts decimal degrees to radians

       '  Convert angles to radians

       '  180 degrees = Pi radians

       Return DegreesDouble * PI / 180

   End Function

   Public Function ValueOf(ByVal Index As Integer, ByVal FieldName As FieldNames) As String

       '  Extract airport information from the Hubs array

       If FieldName = FieldNames.City Then

           Return Hubs(Index).City

       ElseIf FieldName = FieldNames.Lat Then

           Return Hubs(Index).Lat

       ElseIf FieldName = FieldNames.Lon Then

           Return Hubs(Index).Lon

       Else

           Return ""

       End If

   End Function

   Public Function Distance(ByVal Index1 As Integer, ByVal Index2 As Integer) As Double

       '

       'Calculate the distance in miles between the two cities selected in the combo boxes after their latitudes and longitudes

       'have been converted to decimal fractions

       '

       'Spherical law of cosines:  

       'Anton von Braunmühl, Vorlesungen über Geschichte der Trigonometrie, Vol. 1, 1900

       '

       Const R As Double = 3958.761 'mean Earth radius in miles

       Dim Lat1, Lat2, Lon1, Lon2, d As Double

       Lat1 = DegreesToRadians(CoordinateToDegrees(Hubs(Index1).Lat))

       Lat2 = DegreesToRadians(CoordinateToDegrees(Hubs(Index2).Lat))

       Lon1 = DegreesToRadians(CoordinateToDegrees(Hubs(Index1).Lon))

       Lon2 = DegreesToRadians(CoordinateToDegrees(Hubs(Index2).Lon))

        'd = acos(sin(lat1) • sin(lat2) + cos(lat1) • cos(lat2) • cos(long2 long1)) • R

       d = Acos(Sin(Lat1) * Sin(Lat2) + Cos(Lat1) * Cos(Lat2) * Cos(Lon2 - Lon1)) * R

       Return d

   End Function

   Private Sub ID1ComboBox_SelectedIndexChanged(ByVal sender As System.Object, _

               ByVal e As System.EventArgs) Handles ID1ComboBox.SelectedIndexChanged

       '

       'Load Cit1TextBox, Lat1TextBox, Lon1TextBox with values from the array Airports(ID1Integer)

       '

       Index1Integer = ID1ComboBox.SelectedIndex

       City1TextBox.Text = Hubs(Index1Integer).City

       Lat1TextBox.Text = Hubs(Index1Integer).Lat

       Lon1TextBox.Text = Hubs(Index1Integer).Lon

   End Sub

   Private Sub ID2ComboBox_SelectedIndexChanged(ByVal sender As System.Object, _

               ByVal e As System.EventArgs) Handles ID2ComboBox.SelectedIndexChanged

       '

       'Load Cit2TextBox, Lat2TextBox, Lon2TextBox with values from the array Airports(ID2Integer)

       '

       Index2Integer = ID2ComboBox.SelectedIndex

       City2TextBox.Text = Hubs(Index2Integer).City

       Lat2TextBox.Text = Hubs(Index2Integer).Lat

       Lon2TextBox.Text = Hubs(Index2Integer).Lon

   End Sub

   Private Sub CalcDistanceButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CalcDistanceButton.Click

       DistanceTextBox.Text = Distance(Index1Integer, Index2Integer).ToString("F0")

   End Sub

End Class

Explanation / Answer

Imports Microsoft.VisualStudio.TestTools.UnitTesting Imports AirportDistances ''' '''This is a test class for AirportsTest and is intended '''to contain all AirportsTest Unit Tests ''' _ Public Class AirportsTest Private testContextInstance As TestContext ''' '''Gets or sets the test context which provides '''information about and functionality for the current test run. ''' Public Property TestContext() As TestContext Get Return testContextInstance End Get Set(ByVal value As TestContext) testContextInstance = Value End Set End Property #Region "Additional test attributes" ' 'You can use the following additional attributes as you write your tests: ' 'Use ClassInitialize to run code before running the first test in the class ' _ ' 'Public Shared Sub MyClassInitialize(ByVal testContext As TestContext) 'End Sub ' 'Use ClassCleanup to run code after all tests in a class have run ' _ 'Public Shared Sub MyClassCleanup() 'End Sub ' 'Use TestInitialize to run code before running each test ' _ 'Public Sub MyTestInitialize() 'End Sub ' 'Use TestCleanup to run code after each test has run ' _ 'Public Sub MyTestCleanup() 'End Sub ' #End Region ''' '''A test for CoordinateToDegrees ''' _ Public Sub CoordinateToDegreesTest() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim DegreeString As String = String.Empty ' TODO: Initialize to an appropriate value Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value Dim actual As Double DegreeString = "33° 38' 22"" N" expected = 33.63944 delta = 0.00001 actual = target.CoordinateToDegrees(DegreeString) Assert.AreEqual(expected, actual, delta) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for DegreesToRadians ''' _ Public Sub DegreesToRadiansTest() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim DegreesDouble As Double = 0.0! ' TODO: Initialize to an appropriate value Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value Dim actual As Double DegreesDouble = 33.63944 expected = 0.58712 delta = 0.00001 actual = target.DegreesToRadians(DegreesDouble) Assert.AreEqual(expected, actual, delta) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for RadiansToDegrees ''' Public Sub RadiansToDegreesTest() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim RadiansDouble As Double = 0.0! ' TODO: Initialize to an appropriate value Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value Dim actual As Double RadiansDouble = 0.58712 expected = 33.63949 delta = 0.00001 actual = target.RadiansToDegrees(RadiansDouble) Assert.AreEqual(expected, actual, delta) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for Distance ''' _ Public Sub DistanceTest() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim Index1 As Integer = 0 ' TODO: Initialize to an appropriate value Dim Index2 As Integer = 0 ' TODO: Initialize to an appropriate value Dim expected As Double = 0.0! ' TODO: Initialize to an appropriate value Dim delta As Double = 0.0! ' TODO: Initialize to an appropriate value Dim actual As Double target.LoadData() Index1 = 0 Index2 = 1 expected = 945 delta = 1 actual = target.Distance(Index1, Index2) Assert.AreEqual(expected, actual, delta) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for ValueOf (City) ''' _ Public Sub ValueOfTest1() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value Dim actual As String target.LoadData() Index = 0 FieldName = Airports.FieldNames.City expected = "Atlanta" actual = target.ValueOf(Index, FieldName) Assert.AreEqual(expected, actual) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for ValueOf (Latitude) ''' _ Public Sub ValueOfTest2() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value Dim actual As String target.LoadData() Index = 0 FieldName = Airports.FieldNames.Lat expected = "33° 38' 22"" N" actual = target.ValueOf(Index, FieldName) Assert.AreEqual(expected, actual) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub ''' '''A test for ValueOf (Longitude) ''' _ Public Sub ValueOfTest3() Dim target As Airports = New Airports() ' TODO: Initialize to an appropriate value Dim Index As Integer = 0 ' TODO: Initialize to an appropriate value Dim FieldName As Airports.FieldNames = New Airports.FieldNames() ' TODO: Initialize to an appropriate value Dim expected As String = String.Empty ' TODO: Initialize to an appropriate value Dim actual As String target.LoadData() Index = 0 FieldName = Airports.FieldNames.Lon expected = "84° 25' 41"" W" actual = target.ValueOf(Index, FieldName) Assert.AreEqual(expected, actual) 'Assert.Inconclusive("Verify the correctness of this test method.") End Sub End Class

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