public void TestGetParameter()
{
// GIVEN an expression for the parameter
ParameterExpression parameter = Expression.Parameter(typeof(TestClass));
// WHEN a param is requested and the null check mode is set to None
ParameterProvider <TestClass> parameterProvider = new ParameterProvider <TestClass>(parameter, BindingFlags.Instance | BindingFlags.Public, NullCheckMode.None);
Expression result = parameterProvider.GetParameter("StringProperty");
// THEN the returned expression is a method call
Assert.IsInstanceOfType(result, typeof(MethodCallExpression));
// AND the expression contains the correct parameter
Assert.AreSame(parameter, ((MethodCallExpression)result).Object);
// AND the expression contains the getter being accessed
MethodInfo?methodInfo = typeof(TestClass).GetProperty("StringProperty", BindingFlags.Instance | BindingFlags.Public)?.GetGetMethod();
Assert.AreSame(methodInfo, ((MethodCallExpression)result).Method);
}
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);
}