public void Maybe_CompareToUntypedT_NullIsLessThanValue()
{
var a = new Maybe <int>(5);
object b = null;
Assert.Equal(1, a.CompareTo(b));
}
public void Maybe_CompareToUntypedT_NothingIsLessThanValue()
{
var a = new Maybe <int>();
object b = (int)0;
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareToTyped_NothingToNothingReturns0()
{
var a = new Maybe <int>();
var b = new Maybe <int>();
Assert.Equal(0, a.CompareTo(b));
}
public void Maybe_CompareToUntypedT_EqualValuesReturn0()
{
var a = new Maybe <int>(5);
object b = (int)5;
Assert.Equal(0, a.CompareTo(b));
}
public void Maybe_CompareToT_EqualValuesReturn0()
{
var a = new Maybe <int>(5);
var b = 5;
Assert.Equal(0, a.CompareTo(b));
}
public void Maybe_CompareToUntypedT_LowerValueReturnsMinusOne()
{
var a = new Maybe <int>(4);
object b = (int)5;
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareTo_OtherMaybe_NothingIsLessThanValue()
{
var a = new Maybe <int>();
object b = new Maybe <int>(0);
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareTo_OtherMaybe_NothingToNothingReturns0()
{
var a = new Maybe <int>();
object b = new Maybe <int>();
Assert.Equal(0, a.CompareTo(b));
}
public void Maybe_CompareToTyped_LowerValueReturnsMinusOne()
{
var a = new Maybe <int>(4);
var b = new Maybe <int>(5);
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareTo_OtherMaybe_HigherValueReturnsOne()
{
var a = new Maybe <int>(6);
object b = new Maybe <int>(5);
Assert.Equal(1, a.CompareTo(b));
}
public void Maybe_CompareTo_OtherMaybe_EqualValuesReturn0()
{
var a = new Maybe <int>(5);
object b = new Maybe <int>(5);
Assert.Equal(0, a.CompareTo(b));
}
public void Maybe_CompareTo_OtherMaybe_LowerValueReturnsMinusOne()
{
var a = new Maybe <int>(4);
object b = new Maybe <int>(5);
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareToT_NothingIsLessThanValue()
{
var a = new Maybe <int>();
var b = 0;
Assert.Equal(-1, a.CompareTo(b));
}
public void Maybe_CompareToUntypedT_HigherValueReturnsOne()
{
var a = new Maybe <int>(6);
object b = (int)5;
Assert.Equal(1, a.CompareTo(b));
}
public void Maybe_CompareToT_HigherValueReturnsOne()
{
var a = new Maybe <int>(6);
var b = 5;
Assert.Equal(1, a.CompareTo(b));
}
public void Maybe_CompareToTyped_NothingIsLessThanValue()
{
var a = new Maybe <int>();
var b = new Maybe <int>(0);
Assert.Equal(-1, a.CompareTo(b));
Assert.Equal(1, b.CompareTo(a));
}
public void IComparable___Compare_Maybe_of_Int_with_Maybe_of_String___Throws_ArgumentException()
{
var maybeOfInt = new Maybe <int>(42);
var maybeOfString = new Maybe <string>("A");
Action compareInt2String = () =>
{
var _ = maybeOfInt.CompareTo(maybeOfString);
};
Action compareString2Int = () =>
{
var _ = maybeOfString.CompareTo(maybeOfInt);
};
compareInt2String.Should()
.Throw <ArgumentException>(
"because Maybe<int> cannot be compared with Maybe<string> and Int32 cannot be compared with String.");
compareString2Int.Should()
.Throw <ArgumentException>(
"because Maybe<string> cannot be compared with Maybe<int> and String cannot be compared with Int32.");
}
