public void GivenIdOf1ThenReturnAsynchronouslyGangMemberFromDbToMatchExpected()
{
// Instantiate the DataLayer which we are to use.
DataLayer dataLayer = new DataLayer();
// Declare the actual gang member.
GangMember actualMember = null;
// Decide on which gang member we want from the database
int memberID = 1;
// Create a task this goes and gets us the gang member we are after on
// a separate thread. Because I/O can take some time we can now move on
// and do other stuff.
Task<GangMember> actualMemberTask = dataLayer.GetGangMemberByIDAsync(memberID);
// In the mean time while I/O is happening we can instantiate our
// expected gang member, this is what we will test against.
GangMember expectedMember = new GangMember()
{
MemberID = 1,
MemberName = "Gentleman Jack",
MemberRank = "Bootlegger"
};
// We have created our expected gang member, I/O could still be occurring.
// To block any further execution on the calling thread and force us to wait
// until I/O finishes we call the .Result property (the same as the Wait method)
// Note: We wouldn't want to call .Result before we instantiate the expected
// member because this would defeat the purpose of doing async I/O.
actualMember = actualMemberTask.Result;
// Here we test that the expectedMember and actualMember match.
Assert.AreEqual(expectedMember.MemberID, actualMember.MemberID);
Assert.AreEqual(expectedMember.MemberName, actualMember.MemberName);
Assert.AreEqual(expectedMember.MemberRank, actualMember.MemberRank);
}
/// <summary>
/// This method does the same job as the previous one, but this time doing things async. We are not required to
/// do anything like this in the project, but it might be helpful when you come to this topic in your own studies.
/// </summary>
/// <param name="memberID"></param>
/// <returns></returns>
public async Task<GangMember> GetGangMemberByIDAsync(int memberID)
{
GangMember localGangMember = null;
using (SqlConnection sqlConn = new SqlConnection(CONNECTIONSTRING))
{
await sqlConn.OpenAsync();
string sqlQuery = "SELECT * FROM [Members] WHERE MemberID=@memberID";
using (SqlCommand sqlCmd = new SqlCommand(sqlQuery, sqlConn))
{
sqlCmd.Parameters.AddWithValue("memberID", memberID);
using (SqlDataReader sqlDataReader = await sqlCmd.ExecuteReaderAsync())
{
while (await sqlDataReader.ReadAsync())
{
localGangMember = new GangMember();
localGangMember.MemberID = sqlDataReader.GetInt32(0);
localGangMember.MemberName = sqlDataReader.GetString(1);
localGangMember.MemberRank = sqlDataReader.GetString(2);
}
}
}
}
return localGangMember;
}
public void GivenMemberIdOf1MethodReturnsValidGangMember()
{
DataLayer dataLayer = new DataLayer();
int memberID = 1;
GangMember actualMember = dataLayer.GetGangMemberByMemberID(memberID);
GangMember expectedMember = new GangMember()
{
MemberID = 1,
MemberName = "Gentleman Jack",
MemberRank = "Bootlegger"
};
Assert.AreEqual(expectedMember.MemberID, actualMember.MemberID);
Assert.AreEqual(expectedMember.MemberName, actualMember.MemberName);
Assert.AreEqual(expectedMember.MemberRank, actualMember.MemberRank);
}
/// <summary>
/// This method returns all the gang members from the database and stores them into a collection.
/// Notice how in the corresponding test we can loop through all the members to check that they match.
/// </summary>
/// <returns></returns>
public List<GangMember> GetAllGangMembers()
{
List<GangMember> gangMembers = new List<GangMember>();
using (SqlConnection sqlConn = new SqlConnection(CONNECTIONSTRING))
{
sqlConn.Open();
string sqlQuery = "SELECT * FROM [Members]";
using (SqlCommand sqlCmd = new SqlCommand(sqlQuery, sqlConn))
{
using (SqlDataReader sqlDataReader = sqlCmd.ExecuteReader())
{
while (sqlDataReader.Read())
{
GangMember localGangMember = new GangMember();
localGangMember.MemberID = sqlDataReader.GetInt32(0);
localGangMember.MemberName = sqlDataReader.GetString(1);
localGangMember.MemberRank = sqlDataReader.GetString(2);
gangMembers.Add(localGangMember);
}
}
}
}
return gangMembers;
}
public async Task<List<GangMember>> GetAllGangMembersAsync()
{
List<GangMember> gangMembers = new List<GangMember>();
using (SqlConnection sqlConn = new SqlConnection(CONNECTIONSTRING))
{
await sqlConn.OpenAsync();
string sqlQuery = "SELECT * FROM [Members]";
using (SqlCommand sqlCmd = new SqlCommand(sqlQuery, sqlConn))
{
using (SqlDataReader sqlDataReader = await sqlCmd.ExecuteReaderAsync())
{
while (await sqlDataReader.ReadAsync())
{
GangMember localGangMember = new GangMember();
localGangMember.MemberID = sqlDataReader.GetInt32(0);
localGangMember.MemberName = sqlDataReader.GetString(1);
localGangMember.MemberRank = sqlDataReader.GetString(2);
// Comment out the following line of code to make the test fail, this was something that I forgot to do
// and the unit test picked it up - reinforcing why tests are so helpful.
gangMembers.Add(localGangMember);
}
}
}
}
return gangMembers;
}