public void FormulaCantRedefine()
{
var engine = new RecalcEngine();
engine.SetFormula("A", "2", OnUpdate);
// Can't redefine an existing formula.
Assert.Throws <InvalidOperationException>(() =>
engine.SetFormula("A", "3", OnUpdate));
}
public void PropagateNull()
{
var engine = new RecalcEngine();
engine.SetFormula("A", expr: "Blank()", OnUpdate);
engine.SetFormula("B", "A", OnUpdate);
var b = engine.GetValue("B");
Assert.True(b is BlankValue);
}
public void FormulaErrorUndefined()
{
var engine = new RecalcEngine();
// formula fails since 'B' is undefined.
Assert.Throws <InvalidOperationException>(() =>
engine.SetFormula("A", "B*2", OnUpdate));
}
public void RecalcNoExtraCallbacks()
{
var engine = new RecalcEngine();
engine.UpdateVariable("A1", 1);
engine.UpdateVariable("A2", 5);
engine.SetFormula("B", "A1+A2", OnUpdate);
AssertUpdate("B-->6;");
engine.SetFormula("C", "A2*10", OnUpdate);
AssertUpdate("C-->50;");
engine.UpdateVariable("A1", 2);
AssertUpdate("B-->7;"); // Don't fire C, not touched
engine.UpdateVariable("A2", 7);
AssertUpdate("B-->9;C-->70;");
}
public void Recalc2()
{
var engine = new RecalcEngine();
engine.UpdateVariable("A", 1);
engine.SetFormula("B", "A*10", OnUpdate);
AssertUpdate("B-->10;");
engine.SetFormula("C", "B+5", OnUpdate);
AssertUpdate("C-->15;");
// depend on grand child directly
engine.SetFormula("D", "B+A", OnUpdate);
AssertUpdate("D-->11;");
// Updating A will recalc both D and B.
// But D also depends on B, so verify D pulls new value of B.
engine.UpdateVariable("A", 2);
// Batched up (we don't double fire)
AssertUpdate("B-->20;C-->25;D-->22;");
}
public void BasicRecalc()
{
var engine = new RecalcEngine();
engine.UpdateVariable("A", 15);
engine.SetFormula("B", "A*2", OnUpdate);
AssertUpdate("B-->30;");
engine.UpdateVariable("A", 20);
AssertUpdate("B-->40;");
// Ensure we can update to null.
engine.UpdateVariable("A", FormulaValue.NewBlank(FormulaType.Number));
AssertUpdate("B-->0;");
}
public void ChangeRecord()
{
var engine = new RecalcEngine();
engine.UpdateVariable("R", FormulaValue.RecordFromFields(
new NamedValue("F1", FormulaValue.NewBlank(FormulaType.Number)),
new NamedValue("F2", FormulaValue.New(6))));
engine.SetFormula("A", "R.F2 + 3 + R.F1", OnUpdate);
AssertUpdate("A-->9;");
engine.UpdateVariable("R", FormulaValue.RecordFromFields(
new NamedValue("F1", FormulaValue.New(2)),
new NamedValue("F2", FormulaValue.New(7))));
AssertUpdate("A-->12;");
}