public void CoalesceImplicitConversion()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <B> >)(() => new A() ?? new B()));
visitor.Visit((Expression <Func <B> >)(() => new A() ?? new B()));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <C> >)(() => new A() ?? new C()));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void New()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <string> >)(() => new string('a', 4)));
visitor.Visit((Expression <Func <string> >)(() => new string('a', 4)));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <string> >)(() => new string(new char[] { 'a', 'a', 'a', 'a' })));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Coalesce()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int> >)(() => (int?)null ?? 3));
visitor.Visit((Expression <Func <int> >)(() => (int?)null ?? 3));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int> >)(() => (int?)null ?? 4));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void MethodCall()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <Methods, int> >)(x => x.Method1()));
visitor.Visit((Expression <Func <Methods, int> >)(a => a.Method1()));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <Methods, int> >)(a => a.Method2()));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Nulls()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor(null);
visitor.Visit((Expression)null);
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int> >)(() => 3));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int> >)(() => 3));
visitor.Visit((Expression)null);
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Conditional()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int, int, int> >)((x, y) => x > 3 ? x : y));
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a > 3 ? a : b));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a > 3 ? b : a));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a > 2 ? a : b));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a < 3 ? a : b));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Unary()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int, int> >)(x => - x));
visitor.Visit((Expression <Func <int, int> >)(a => - a));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int> >)(a => + a));
Assert.IsFalse(visitor.IsLastVisitedEqual);
var aParam = Expression.Parameter(typeof(int));
visitor.Visit(Expression.Lambda(Expression.Negate(aParam), aParam));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit(Expression.Lambda(Expression.Negate(aParam, typeof(ExpressionEqualityComparisonVisitor).GetMethod(nameof(NegateNumber), BindingFlags.Public | BindingFlags.Static)), aParam));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Index()
{
var stringIndexer = typeof(Dictionary <string, string>).GetProperties().Single(p => p.GetIndexParameters().Any());
var key = Expression.Constant("key");
var xParam = Expression.Parameter(typeof(Dictionary <string, string>));
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor(Expression.Lambda(Expression.MakeIndex(xParam, stringIndexer, new Expression[] { key }), xParam));
var aParam = Expression.Parameter(typeof(Dictionary <string, string>));
visitor.Visit(Expression.Lambda(Expression.MakeIndex(aParam, stringIndexer, new Expression[] { key }), aParam));
Assert.IsTrue(visitor.IsLastVisitedEqual);
var bread = Expression.Constant("bread");
visitor.Visit(Expression.Lambda(Expression.MakeIndex(aParam, stringIndexer, new Expression[] { bread }), aParam));
Assert.IsFalse(visitor.IsLastVisitedEqual);
var intIndexer = typeof(Dictionary <int, string>).GetProperties().Single(p => p.GetIndexParameters().Any());
var two = Expression.Constant(2);
var dict = Expression.Constant(new Dictionary <int, string>());
visitor.Visit(Expression.Lambda(Expression.MakeIndex(dict, intIndexer, new Expression[] { two }), aParam));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
public void Binary()
{
var visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int, int, int> >)((x, y) => x + y));
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a + b));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a - b));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => b + a));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor.Visit((Expression <Func <int, int, int> >)((a, b) => a + b + a));
Assert.IsFalse(visitor.IsLastVisitedEqual);
visitor = new ActiveExpressions.ExpressionEqualityComparisonVisitor((Expression <Func <int, int, int> >)((x, y) => x + y));
var aParam = Expression.Parameter(typeof(int));
var bParam = Expression.Parameter(typeof(int));
visitor.Visit(Expression.Lambda(Expression.Add(aParam, bParam), aParam, bParam));
Assert.IsTrue(visitor.IsLastVisitedEqual);
visitor.Visit(Expression.Lambda(Expression.Add(aParam, bParam, typeof(ExpressionEqualityComparisonVisitor).GetMethod(nameof(AddNumbers), BindingFlags.Public | BindingFlags.Static)), aParam, bParam));
Assert.IsFalse(visitor.IsLastVisitedEqual);
}
