public void If()
{
var airplane = new Airplane {
Engine = new Engine()
};
Assert.Equal("crashing", airplane.With(x => airplane)
.With(x => x.Engine)
.If(x => x.HasFuel)
.Return(x => "flying", "crashing"));
var engine = airplane.With(x => airplane)
.With(x => x.Engine)
.If(x => x.HasFuel);
Assert.Null(engine);
airplane.Engine.HasFuel = true;
Assert.Equal("flying", airplane.With(x => airplane)
.With(x => x.Engine)
.If(x => x.HasFuel)
.Return(x => "flying", "crashing"));
engine = airplane.With(x => airplane)
.With(x => x.Engine)
.If(x => x.HasFuel);
Assert.NotNull(engine);
Assert.True(true);
}
public void Branch1()
{
var airplane = new Airplane {
Engine = new Engine()
};
var hasEngine = string.Empty;
airplane.With(a => a.Engine).Branch(_ => hasEngine = "yes", () => hasEngine = "no");
Assert.Equal("yes", hasEngine);
airplane.Engine = null;
airplane.With(a => a.Engine).Branch(_ => hasEngine = "yes", () => hasEngine = "no");
Assert.Equal("no", hasEngine);
Assert.True(true);
}
public void Guard()
{
// cast guard
var jet = new Jet();
Assert.Null(jet.CastSafe <Airplane>());
// null guard
var airplane = new Airplane();
Assert.Null(airplane.With(a => a.Engine));
// condition guard
airplane.Engine = new Engine();
Assert.Null(airplane.If(a => a.Engine.HasFuel));
// all guards pass
airplane.Engine.HasFuel = true;
var result = string.Empty;
airplane.CastSafe <Airplane>().With(a => a.Engine).If(e => e.HasFuel).Do(e => result = "success");
Assert.Equal("success", result);
Assert.True(true);
}
public void Branch2()
{
var airplane = new Airplane {
Engine = new Engine {
HasFuel = true
}
};
var hasFuel = string.Empty;
airplane.With(a => a.Engine).HasFuel.Branch(() => hasFuel = "yes", () => hasFuel = "no");
Assert.Equal("yes", hasFuel);
airplane.Engine.HasFuel = false;
airplane.With(a => a.Engine).HasFuel.Branch(() => hasFuel = "yes", () => hasFuel = "no");
Assert.Equal("no", hasFuel);
Assert.True(true);
}
public void IfReturn2()
{
var airplane = new Airplane {
Engine = new Engine {
HasFuel = true, FuelType = "123"
}
};
Func <string, string> func123 = s => s.Equals("123") ? "123 matches" : "123 does not match";
Func <string, string> funcMissing = _ => "missing";
Assert.Equal("123 matches", airplane.With(a => a.Engine).IfReturn(e => e.HasFuel, e => func123, funcMissing)("123"));
Assert.Equal("123 does not match", airplane.With(a => a.Engine).IfReturn(e => e.HasFuel, e => func123, funcMissing)("456"));
airplane.Engine = null;
Assert.Equal("missing", airplane.With(a => a.Engine).IfReturn(e => e.HasFuel, e => func123, funcMissing)("123"));
Assert.True(true);
}
public void Return1()
{
var airplane = new Airplane();
// if no fuelType, then return empty string
Assert.Equal(string.Empty, airplane.With(x => airplane)
.With(x => x.Engine)
.Return(x => x.FuelType, string.Empty));
airplane.Engine = new Engine {
FuelType = "123"
};
Assert.Equal("123", airplane.With(x => airplane)
.With(x => x.Engine)
.Return(x => x.FuelType, string.Empty));
Assert.True(true);
}
public void Unless()
{
var airplane = new Airplane {
Engine = new Engine()
};
Assert.Equal("crashing", airplane.With(x => airplane)
.With(x => x.Engine)
.Unless(x => x.HasFuel)
.Return(x => "crashing", "flying"));
airplane.Engine.HasFuel = true;
Assert.Equal("flying", airplane.With(x => airplane)
.With(x => x.Engine)
.Unless(x => x.HasFuel)
.Return(x => "crashing", "flying"));
Assert.True(true);
}
public void With()
{
var airplane = new Airplane();
Assert.Null(airplane.With(x => airplane)
.With(x => x.Engine)
.With(x => x.FuelType));
airplane.Engine = new Engine();
Assert.Null(airplane.With(x => airplane)
.With(x => x.Engine)
.With(x => x.FuelType));
airplane.Engine.FuelType = "123";
Assert.NotNull(airplane.With(x => airplane)
.With(x => x.Engine)
.With(x => x.FuelType));
Assert.True(true);
}
public void Do()
{
var airplane = new Airplane {
Engine = new Engine {
FuelType = "123", HasFuel = true
}
};
Assert.Equal("correct fuel", airplane.With(x => airplane)
.With(x => x.Engine)
.Do(FillupAndTestFuelGrade())
.If(x => x.FuelTypeTest)
.Return(x => "correct fuel", "bad fuel"));
airplane.Engine.FuelType = "999";
Assert.Equal("bad fuel", airplane.With(x => airplane)
.With(x => x.Engine)
.Do(FillupAndTestFuelGrade())
.If(x => x.FuelTypeTest)
.Return(x => "correct fuel", "bad fuel"));
Assert.True(true);
}
public void Return3()
{
var airplane = new Airplane {
Engine = new Engine {
FuelType = "123"
}
};
Assert.Equal("123", airplane.With(x => airplane)
.With(x => x.Engine)
.Return(x => x.FuelType, () => string.Empty));
Assert.True(true);
}
public void Return5()
{
var airplane = new Airplane {
Engine = new Engine {
FuelType = "123", HasFuel = true
}
};
Assert.Equal("123", airplane.With(x => airplane)
.With(x => x.Engine)
.HasFuel
.Return(() => "123", () => string.Empty));
Assert.True(true);
}
