public void Print_ConvertConstant_PrintsNumber()
{
Expression<Func<decimal>> constantExpression = () => 5;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(constantExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("5"));
}
public void Print_Array_Prints()
{
var a = new[] {1, 2};
Expression<Func<int>> arrayAccessor = () => a[1];
var visitor = new AssertionExpressionVisitor();
visitor.Visit(arrayAccessor);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("a[1] [2]"));
}
public void Print_EqualityExpression_PrintsWithDoubleEqualSign()
{
var condition1 = 1;
var condition2 = 2;
Expression<Func<bool>> equalityExpression = () => condition1 == condition2;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(equalityExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("(condition1 [1] == condition2 [2]) [False]"));
}
public void Print_BinaryExpression_Prints()
{
var a = 1;
var b = 2;
Expression<Func<decimal>> binaryExpression = () => a*b;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(binaryExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("(a [1] * b [2]) [2]"));
}
public void Print_Conditional_Prints()
{
var a = true;
var b = false;
var c = true;
Expression<Func<bool>> memberAccess = () => a ? b : c;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(memberAccess);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("(a [True] ? b [False] : c [True])"));
}
public virtual void Expect(Expression<Func<bool>> expression)
{
if (EnableExpressionInspection)
{
var inspector = new InspectExpressionVisitor();
inspector.Check(expression);
}
var pass = expression.Compile().Invoke();
var visitor = new AssertionExpressionVisitor();
visitor.GenerateAssertionMessage(expression);
if (pass)
{
Console.Write("Assertion passed: ");
Console.WriteLine(visitor.GetAssertionMessage());
return;
}
throw new AssertionException(string.Format("Assertion failed: {0}", visitor.GetAssertionMessage()));
}
public void Print_MethodCall_Prints()
{
var account = new Account();
account.SetName("Bob");
var visitor = new AssertionExpressionVisitor();
Expression<Func<string>> methodCall = () => account.GetName();
visitor.Visit(methodCall);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("account.GetName() ['Bob']"));
}
public void Print_MemberAccess_Prints()
{
var account = new Account();
var initialDeposit = 100;
account.Deposit(initialDeposit);
var visitor = new AssertionExpressionVisitor();
Expression<Func<decimal>> memberAccess = () => account.Balance;
visitor.Visit(memberAccess);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("account.Balance [100]"));
}
private string GetMessage(AssertionExpressionVisitor visitor)
{
var message = visitor.GetAssertionMessage();
Console.WriteLine(message);
return message;
}
public void Print_WithEvaluatingOff_PrintsWithoutValues()
{
var a = 1;
var b = 2;
var visitor = new AssertionExpressionVisitor();
visitor.EvaluateValues = false;
Expression<Func<bool>> expression = () => a + b + 3 == 6;
visitor.Visit(expression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("(((a + b) + 3) == 6)"));
}
public void Print_VariableConstant_PrintsNameAndValue()
{
var number = 5m;
Expression<Func<decimal>> constantExpression = () => number;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(constantExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("number [5]"));
}
public void Print_UnaryExpression_PrintsOperator()
{
var intNumber = 5;
Expression<Func<decimal>> unaryExpression = () => intNumber;
var visitor = new AssertionExpressionVisitor();
visitor.Visit(unaryExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("intNumber [5]"));
}
public void Print_TrueConstant_PrintsTrue()
{
var visitor = new AssertionExpressionVisitor();
visitor.VisitConstant(Expression.Constant(true));
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("True"));
}
public void Print_QueryWithArgument_Prints()
{
var account = new Account();
var visitor = new AssertionExpressionVisitor();
int a = 2;
Expression<Action> queryWithArgument = () => account.AddNumbers(a, 1);
visitor.Visit(queryWithArgument);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("account.AddNumbers(a [2], 1) [3]"));
}
public void Print_NestedBinaryExpression_Prints()
{
var a = 1;
var b = 2;
var c = 3;
Expression<Func<decimal>> binaryExpression = () => a*(b + c);
var visitor = new AssertionExpressionVisitor();
visitor.Visit(binaryExpression);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("(a [1] * (b [2] + c [3]) [5]) [5]"));
}
public void Print_MethodWithArgument_Prints()
{
var account = new Account();
account.SetName("Bob");
var visitor = new AssertionExpressionVisitor();
decimal amount = 100;
decimal otherAmount = 200;
Expression<Action> methodWithArgument = () => account.Deposits(amount, otherAmount);
visitor.Visit(methodWithArgument);
var message = GetMessage(visitor);
Expect(message, Is.EqualTo("account.Deposits(amount [100], otherAmount [200])"));
}
