public void AppendMemberAssignmentThrowsInvalidOperationExceptionOnDuplicateMemberAssignement()
{
// Arrange
IQueryable <TestClass> queryable = new List <TestClass>().AsQueryable();
var statementBuilder = new UpdateStatementBuilder <TestClass>(queryable);
MemberAssignment assignment
= Expression.Bind(
typeof(TestClass).GetProperty(nameof(TestClass.Id)),
Expression.Constant(3)
);
// Act and Assert
statementBuilder.AppendMemberAssignment(assignment);
Assert.Throws <InvalidOperationException>(
() => statementBuilder.AppendMemberAssignment(assignment)
);
}
public void AppendMemberAssignmentThrowsArgumentNullExceptionWhenExpressionIsNull()
{
// Arrange
IQueryable <TestClass> queryable = new List <TestClass>().AsQueryable();
var statementBuilder = new UpdateStatementBuilder <TestClass>(queryable);
// Act and Assert
Assert.Throws <ArgumentNullException>(
() => statementBuilder.AppendMemberAssignment(null)
);
}
public void AppendMemberAssignmentThrowsArgumentExceptionWhenMemberIsNotOfTheRightType()
{
// Arrange
IQueryable <TestClass> queryable = new List <TestClass>().AsQueryable();
var statementBuilder = new UpdateStatementBuilder <TestClass>(queryable);
MemberAssignment assignment
= Expression.Bind(
typeof(OtherClass).GetProperty(nameof(OtherClass.Id)),
Expression.Constant(3)
);
// Act and Assert
Assert.Throws <ArgumentException>(
() => statementBuilder.AppendMemberAssignment(assignment)
);
}
public static int Update <T>(this IQueryable <T> queryable, Expression <Func <T, T> > constructorExpression) where T : class
{
// Check & Cast parameters
Check.NotNull(queryable, nameof(queryable));
MemberInitExpression memberInit
= constructorExpression.Body as MemberInitExpression
?? throw new ArgumentException(nameof(constructorExpression), $"The body of the expression must be of type\"{typeof(MemberInitExpression).Name}\".");
// Create statement
var statementBuilder = new UpdateStatementBuilder <T>(queryable);
foreach (MemberAssignment assignement in memberInit.Bindings)
{
statementBuilder.AppendMemberAssignment(assignement);
}
// Act
return(Update <T>(statementBuilder));
}
public void AppendMemberAssignmentShouldAppendAssignment()
{
// Arrange
IQueryable <TestClass> queryable = new List <TestClass>().AsQueryable();
var statementBuilder = new UpdateStatementBuilder <TestClass>(queryable);
MemberAssignment assignment
= Expression.Bind(
typeof(TestClass).GetProperty(nameof(TestClass.Id)),
Expression.Constant(3)
);
// Act
statementBuilder.AppendMemberAssignment(assignment);
// Assert
Assert.Single(statementBuilder.Assignements);
Assert.Same(assignment, statementBuilder.Assignements.First());
}