/// <summary>
/// Returns a mock of a DbContext
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static MockedDBContext <T> GetMockContext <T>() where T : DbContext
{
var instance = new MockedDBContext <T>();
instance.MockTables();
return(instance);
}
/// <summary>
/// Mocks all the DbSet{T} properties that represent tables in a DbContext.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="mockedContext"></param>
public static void MockTables <T>(this MockedDBContext <T> mockedContext) where T : DbContext
{
Type contextType = typeof(T);
var dbSetProperties = contextType.GetProperties().Where(prop => (prop.PropertyType.IsGenericType) && prop.PropertyType.GetGenericTypeDefinition() == typeof(DbSet <>));
foreach (var prop in dbSetProperties)
{
var dbSetGenericType = prop.PropertyType.GetGenericArguments()[0];
Type listType = typeof(List <>).MakeGenericType(dbSetGenericType);
var listForFakeTable = Activator.CreateInstance(listType);
var parameter = Expression.Parameter(contextType);
var body = Expression.PropertyOrField(parameter, prop.Name);
var lambdaExpression = Expression.Lambda <Func <T, object> >(body, parameter);
var method = typeof(EntityFrameworkMockHelper).GetMethod("MockDbSet").MakeGenericMethod(dbSetGenericType);
mockedContext.Setup(lambdaExpression).Returns(method.Invoke(null, new[] { listForFakeTable }));
mockedContext.Tables.Add(prop.Name, listForFakeTable);
}
}