/// <summary>
/// Retrieves a fluent mock from the given setup expression.
/// </summary>
private static Mock <TResult> FluentMock <T, TResult>(Mock <T> mock, Expression <Func <T, TResult> > setup)
where T : class
where TResult : class
{
Guard.NotNull(mock, nameof(mock));
Guard.NotNull(setup, nameof(setup));
Guard.IsMockable(typeof(TResult));
MethodInfo info;
IReadOnlyList <Expression> arguments;
if (setup.Body.NodeType == ExpressionType.MemberAccess)
{
var memberExpr = ((MemberExpression)setup.Body);
Guard.NotField(memberExpr);
info = ((PropertyInfo)memberExpr.Member).GetGetMethod();
arguments = new Expression[0];
}
else if (setup.Body.NodeType == ExpressionType.Call)
{
var callExpr = (MethodCallExpression)setup.Body;
info = callExpr.Method;
arguments = callExpr.Arguments;
}
else
{
throw new NotSupportedException(string.Format(Resources.UnsupportedExpression, setup.ToStringFixed()));
}
Guard.IsMockable(info.ReturnType);
Mock fluentMock;
object result;
if (mock.Setups.GetInnerMockSetups().TryFind(new InvocationShape(setup, info, arguments), out var inner))
{
Debug.Assert(inner.TryGetReturnValue(out _)); // guaranteed by .GetInnerMockSetups()
fluentMock = inner.GetInnerMock();
_ = inner.TryGetReturnValue(out result);
}
else
{
result = mock.GetDefaultValue(info, out fluentMock, useAlternateProvider: DefaultValueProvider.Mock);
Debug.Assert(fluentMock != null);
Mock.SetupAllProperties(fluentMock);
}
mock.AddInnerMockSetup(info, arguments, setup, result);
return((Mock <TResult>)fluentMock);
}