public void ExpressionChain_And_FourArguments_Success()
{
Expression <Func <Person, bool> > f1 = x => x.Id > 0;
Expression <Func <Person, bool> > f2 = x => x.Category == "CATEGORY 1";
Expression <Func <Person, bool> > f3 = x => x.Name == "Dude";
Expression <Func <Person, bool> > f4 = x => x.City == "LA";
Expression <Func <Person, bool> > mergedExpression = ExpressionChain.And(f1, f2, f3, f4);
IQueryable <Person> mockups = new List <Person>
{
new Person {
Id = 0, Category = "CATEGORY 1", Name = "Duderino", City = "LA"
}, // Miss: Id <= 0
new Person {
Id = 1, Category = "CATEGORY 1", Name = "Dude", City = "LA"
}, // Hit
new Person {
Id = 2, Category = "CATEGORY 1", Name = "Dude", City = "NY"
}, // Miss:City != LA
new Person {
Id = 3, Category = "CATEGORY 2", Name = "Dude", City = "LA"
}, // Miss: Category
}.AsQueryable();
Assert.IsTrue(mockups.Where(mergedExpression).Count() == 1);
}
public void ExpressionChain_And_OneArgument_ReturnsSame()
{
Expression <Func <Person, bool> > f1 = x => x.Id > 0;
Expression <Func <Person, bool> > mergedExpression = ExpressionChain.And(f1);
Assert.IsTrue(mergedExpression == f1);
}
public void ExpressionChain_And_ThreeArguments_Success()
{
Expression <Func <Person, bool> > f1 = x => x.Id > 0;
Expression <Func <Person, bool> > f2 = x => x.Category == "CATEGORY 1";
Expression <Func <Person, bool> > f3 = x => x.Name == "Dude";
Expression <Func <Person, bool> > mergedExpression = ExpressionChain.And(f1, f2, f3);
IQueryable <Person> mockups = new List <Person>
{
new Person {
Id = 0, Category = "CATEGORY 1", Name = "Duderino"
},
new Person {
Id = 1, Category = "CATEGORY 1", Name = "Dude"
},
new Person {
Id = 2, Category = "CATEGORY 1", Name = "Dude"
},
new Person {
Id = 3, Category = "CATEGORY 2", Name = "Dude"
},
}.AsQueryable();
Assert.IsTrue(mockups.Where(mergedExpression).Count() == 2);
}
public void ExpressionChain_And_ArgumentNull_ThrowsArgumentNullException()
{
Expression <Func <Person, bool> >[] includes = null;
ArgumentNullException ex = Assert.ThrowsException <ArgumentNullException>(() => ExpressionChain.And(includes));
Assert.AreEqual(ex.Message, "Value cannot be null. (Parameter 'expressions')");
}