public void TestGetParameterWithMissingNestedProperty()
{
// GIVEN an expression for the parameter
ParameterExpression parameter = Expression.Parameter(typeof(TestClass));
// WHEN a param is requested with a nested property name missing from the object
// THEN an exception is thrown
ParameterProvider <TestClass> parameterProvider = new ParameterProvider <TestClass>(parameter, BindingFlags.Instance | BindingFlags.Public, NullCheckMode.None);
FormatStringSyntaxException e = Assert.ThrowsException <FormatStringSyntaxException>(() => parameterProvider.GetParameter("NestedTestClassProperty.NonExistent"));
Assert.AreEqual("Property 'NonExistent' not found on type 'FastStringFormat.Parsing.ParameterProviderTests+NestedTestClass'. Does it have a public get accessor?", e.Message);
}
public void TestToExpressionWithInvalidProperty()
{
// GIVEN expressions for parameters
Mock <IParameterProvider <object> > parameterProvider = new Mock <IParameterProvider <object> >();
Expression formatProvider = Expression.Constant(null);
// AND the parameter provider can find the property but it's not IFormattable
Expression dateTimeExpression = Expression.Constant(new object());
parameterProvider.Setup(p => p.GetParameter("ObjectProperty")).Returns(dateTimeExpression);
// WHEN the param segment is converted to an expression with a property that is not IFormattable
// THEN an exception is thrown
FormattedParamSegment paramSegment = new FormattedParamSegment("ObjectProperty", "yyyy-MM-dd");
FormatStringSyntaxException e = Assert.ThrowsException <FormatStringSyntaxException>(() => paramSegment.ToExpression(parameterProvider.Object, formatProvider));
Assert.AreEqual("Property 'ObjectProperty' does not return a type implementing IFormattable hence a format string cannot be applied to it.", e.Message);
}
