public void Run_ThrowsException_InputStackIsIncorrect()
{
// Arrange
string operation = "+";
CommandContext context = new CommandContext();
context.PushStack(new MutableKeyValuePair <string, object>("var1", 5));
var math = new MathCommand(operation, context);
// Act
void result() => math.Run();
// Assert
Assert.Throws <CommandExecutionException>(result);
}
public void Run_SqrtOfVariable_InputOperationIsSqrt()
{
// Arrange
string operation = "SQRT";
CommandContext context = new CommandContext();
context.PushStack(new MutableKeyValuePair <string, object>("var1", 25));
double expectedNumber = 5;
var expectedName = "ans";
var math = new MathCommand(operation, context);
// Act
math.Run();
// Assert
Assert.Equal(expectedNumber, context.Stack.Peek().Value);
Assert.Equal(expectedName, context.PeekLastStackElement().Id);
}