public int Calculate(string equation)
{
var value = 0;
var range = _nestingIdentifier.FindDeepestNest(equation);
while (range != null)
{
var nest = equation.Substring(range.StartIndex + 1, range.Length - 2);
var resolvedNest = _mathsResolver.ResolveSection(nest);
equation = equation.Remove(range.StartIndex, range.Length);
equation = equation.Insert(range.StartIndex, resolvedNest);
range = _nestingIdentifier.FindDeepestNest(equation);
}
return(Int32.Parse(_mathsResolver.ResolveSection(equation)));
}
public void Calculate_NoBrackets_ReturnsDirectCalculation()
{
var equation = "1";
StringRange deepestNest = null;
var section = "1";
A.CallTo(() => _nestingIdentifier.FindDeepestNest(equation)).Returns(deepestNest);
A.CallTo(() => _mathsResolver.ResolveSection(section)).Returns("1");
var response = _calculator.Calculate(equation);
response.Should().Be(1);
A.CallTo(() => _nestingIdentifier.FindDeepestNest(equation)).MustHaveHappened();
A.CallTo(() => _mathsResolver.ResolveSection(section)).MustHaveHappened();
}
