public void EnsureCorrectType_SafeValueConversion()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(int));
var expectedType = typeof(long);
ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
}
public void EnsureCorrectType_UnsafeCastRequired()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(object));
var expectedType = typeof(string);
ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
}
public void EnsureCorrectType_CompletelyUnrelated()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(string));
var expectedType = typeof(List <int>);
ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
}
public void EnsureCorrectType_BoxingConvertibleToInterface()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(int));
var expectedType = typeof(IComparable);
var result = ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
CheckExpressionIsConverted(expression, expectedType, result);
}
public void EnsureCorrectType_ReferenceAssignable()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(string));
var expectedType = typeof(object);
var result = ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
Assert.That(result, Is.SameAs(expression));
}
public void EnsureCorrectType_Exact_ValueTypes()
{
var expectedType = typeof(int);
var expression = ExpressionTreeObjectMother.GetSomeExpression(expectedType);
var result = ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
Assert.That(result, Is.SameAs(expression));
}
public void EnsureCorrectType_SafeValueConversion()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(int));
var expectedType = typeof(long);
Assert.That(
() => ExpressionTypeUtility.EnsureCorrectType(expression, expectedType),
Throws.InvalidOperationException
.With.Message.EqualTo(
"Type 'System.Int32' cannot be implicitly converted to type 'System.Int64'. "
+ "Use Expression.Convert or Expression.ConvertChecked to make the conversion explicit."));
}
public void EnsureCorrectType_UnsafeCastRequired()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(object));
var expectedType = typeof(string);
Assert.That(
() => ExpressionTypeUtility.EnsureCorrectType(expression, expectedType),
Throws.InvalidOperationException
.With.Message.EqualTo(
"Type 'System.Object' cannot be implicitly converted to type 'System.String'. "
+ "Use Expression.Convert or Expression.ConvertChecked to make the conversion explicit."));
}
public void EnsureCorrectType_CompletelyUnrelated()
{
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(string));
var expectedType = typeof(List <int>);
Assert.That(
() => ExpressionTypeUtility.EnsureCorrectType(expression, expectedType),
Throws.InvalidOperationException
.With.Message.EqualTo(
"Type 'System.String' cannot be implicitly converted to type 'System.Collections.Generic.List`1[System.Int32]'. "
+ "Use Expression.Convert or Expression.ConvertChecked to make the conversion explicit."));
}
public void EnsureCorrectType_NonVoidExpression_WrappedAsVoid()
{
var expectedType = typeof(void);
var expression = ExpressionTreeObjectMother.GetSomeExpression(typeof(string));
var result = ExpressionTypeUtility.EnsureCorrectType(expression, expectedType);
Assert.That(result, Is.AssignableTo <BlockExpression>());
var blockExpression = (BlockExpression)result;
Assert.That(blockExpression.Type, Is.SameAs(expectedType));
Assert.That(blockExpression.Expressions, Is.EqualTo(new[] { expression }));
}