public void Map_AnEmptyProjection_ShouldNotMapAnythingBecauseItsNotProjectingProperties()
{
// Arrange
Expression <Func <Person, dynamic> > projector = p => new { };
// Act
Expression projectorMapped = _columnExpressionMapper.Map(projector);
// Assert
List <ColumnExpression> columnExpressions = new ColumnExpressionsFetcher().FetchAll(projectorMapped);
Assert.True(columnExpressions.Count == 0);
}
public void Map_AnonymousTypeProjectionWithOneProperty_ShouldMapThePropertyToAColumnExpression()
{
// Arrange
Expression <Func <Person, dynamic> > projector = p => new { p.Id };
// Act
Expression projectorMapped = _columnExpressionMapper.Map(projector);
// Assert
var memberExpression = (MemberExpression)((NewExpression)projector.Body).GetExpressionByMember("Id");
ColumnExpression columnExpressionMapped = new ColumnExpressionsFetcher().FetchAll(projectorMapped)[0];
Assert.True(columnExpressionMapped.ColumnMapper == memberExpression);
}
public void Map_UserDefinedTypeProjectionWithOneProperty_ShouldMapThePropertyToColumnExpression()
{
// Arrange
Expression <Func <Person, dynamic> > projector = p => new Person()
{
Id = p.Id
};
// Act
Expression projectorMapped = _columnExpressionMapper.Map(projector);
// Assert
var m = (MemberExpression)((MemberInitExpression)projector.Body).GetExpressionByMember("Id");
var columnExpression = new ColumnExpression(m);
List <ColumnExpression> columnExpressions = new ColumnExpressionsFetcher().FetchAll(projectorMapped);
Assert.True(columnExpression.ColumnMapper == columnExpressions[0].ColumnMapper);
}
public void Map_AnonymousTypeProjectionWithMultipleProperties_ShouldMapThePropertiesToColumnExpressions()
{
// Arrange
Expression <Func <Person, dynamic> > projector = p => new { p.Id, p.FirstName, p.LastName };
// Act
Expression projectorMapped = _columnExpressionMapper.Map(projector);
// Asserts
Expression[] newExpArgs = ((NewExpression)projector.Body).GetArguments();
ColumnExpression[] columnExpressions = new ColumnExpressionsFetcher().FetchAll(projectorMapped).ToArray();
Assert.False(newExpArgs.Length != columnExpressions.Length, $"Expected {newExpArgs.Length} columns mapped, but instead {columnExpressions.Length} columns were mapped.");
for (int index = 0; index < newExpArgs.Length; index++)
{
Assert.False(newExpArgs[index] != columnExpressions[index].ColumnMapper, $"Dismatch between expressions mapped. Expected: {newExpArgs[index]} ; Mapped: {columnExpressions[index].ColumnMapper}");
}
}
public void Map_UserDefinedTypeProjectionWithMultipleProperties_ShouldMapThePropertiesToColumnExpressions()
{
// Arrange
Expression <Func <Person, dynamic> > projector = p => new Person()
{
Id = p.Id, FirstName = p.LastName
};
// Act
Expression projectorMapped = _columnExpressionMapper.Map(projector);
// Asserts
Expression[] bindingExpressions = ((MemberInitExpression)projector.Body).GetBindingExpressions();
ColumnExpression[] columnExpressions = new ColumnExpressionsFetcher().FetchAll(projectorMapped).ToArray();
Assert.False(bindingExpressions.Length != columnExpressions.Length, $"Expected {bindingExpressions.Length} columns mapped, but instead {columnExpressions.Length} columns were mapped.");
for (int index = 0; index < bindingExpressions.Length; index++)
{
Assert.False(bindingExpressions[index] != columnExpressions[index].ColumnMapper, $"Dismatch between expressions mapped. Expected: {bindingExpressions[index]} ; Mapped: {columnExpressions[index].ColumnMapper}");
}
}