Testing in Visual Basic with structures - vb.net

Question

I have a VS2012 Visual Basic.NET application and am wanting to create some unit tests for this application.
In my application, I have a module that contains the following structure:
<Serializable()> Public Structure MediaItem
Dim longMediaID As Long
Dim MediaObject As WMPLib.IWMPMedia
Dim FileInfoObject As FileInfo
Dim stringGenre As String
Dim stringMediaDuration As String
Dim doubleMediaLength As Double
End Structure
How do I 'Import' the above MediaItem structure so that I can do some Unit Testing using this structure? Currently, the TestClass cannot 'see' this structure.
UPDATE
This structure is custom made by myself. It is not actually in a class, it is in a module.
UPDATE 2
Here is the module code:
Imports System.IO
Namespace modCanMediaStructures
Module modCanMediaStructures
<Serializable()> Public Structure MediaItem
Dim longMediaID As Long
Dim MediaObject As WMPLib.IWMPMedia
Dim FileInfoObject As FileInfo
Dim stringGenre As String
Dim stringMediaDuration As String
Dim doubleMediaLength As Double
End Structure
<Serializable()> Public Structure MediaPlayList
Dim stringMediaPlayListName As String
Dim stringMediaPlayListDescription As String
Dim stringMediaPlayListComments As String
Dim mediaItemList As List(Of MediaItem)
Dim stringPlayListDuration As String
Dim doublePlayListDuration As Double
Dim booleanShuffle As Boolean
Dim booleanLoop As Boolean
End Structure
Public Structure genreItem
Dim stringGenreName As String
Dim longGenreCount As Long
Dim doubleGenreDuration As Double
End Structure
<Serializable()> Public Structure ScheduleItem
Dim stringItemName As String
Dim stringItemPlaylist As String
Dim stringItemDuration As String
Dim stringItemComments As String
Dim doubleItemDuration As Double
Dim booleanStartDateIsDerivedFromEndOfOtherScheduleItem As Boolean
Dim stringScheduleItemThatStartDateIsDerivedFrom As String
Dim dateItemStartDateTime As Date
Dim dateItemEndDateTime As Date
Dim booleanEndDateIsDerivedFromPlayListDuration As Boolean
End Structure
End Module
End Namespace
In my main form, I declare a variable as follows:
Dim testMediaItem As modCanMediaStructures.MediaItem
After importing the following statement:
Imports modCanMediaStructures
This works. However, when I do the same statement in the UnitTest test, the following error occurs:
Type 'modCanMediaStructures.MediaItem' is not defined
Here is my code:
Imports System.Text
Imports Microsoft.VisualStudio.TestTools.UnitTesting
Imports CanMediaPlayer
Imports modCanMediaStructures
<TestClass()> Public Class MediaListTests
<TestMethod()> Public Sub TestaddMediaItemToList()
Dim myStructure As New modCanMediaStructures.MediaItem
End Sub
End Class
I believe that this is happeneing because the UnitTest Project cannot actually 'see' the code in the other solution files.
May I please have some help to get this working?