public string Format(ChordClass chordClass)
{
string pitchClassString = chordClass.PitchClass.PitchClass switch
{
PitchClass a when a.Equals(PitchClass.A) => "A",
PitchClass b when b.Equals(PitchClass.B) => "B",
PitchClass c when c.Equals(PitchClass.C) => "C",
PitchClass d when d.Equals(PitchClass.D) => "D",
PitchClass e when e.Equals(PitchClass.E) => "E",
PitchClass f when f.Equals(PitchClass.F) => "F",
PitchClass g when g.Equals(PitchClass.G) => "G",
_ => throw new InvalidOperationException()
};
string accidentalString = chordClass.PitchClass.Accidental switch
{
Accidental flat when flat.Equals(Accidental.Flat) => "b",
Accidental sharp when sharp.Equals(Accidental.Sharp) => "#",
Accidental natural when natural.Equals(Accidental.Natural) => string.Empty,
_ => throw new InvalidOperationException()
};
string patternString = chordClass switch
{
ChordClass major when major.Pattern.Equals(TriadPattern.Major) => string.Empty,
ChordClass minor when minor.Pattern.Equals(TriadPattern.Minor) => "m",
ChordClass sus2 when sus2.Pattern.Equals(TriadPattern.SuspendedSecond) => "sus2",
ChordClass sus4 when sus4.Pattern.Equals(TriadPattern.SuspendedFourth) => "sus4",
_ => throw new InvalidOperationException()
};
return($"{pitchClassString}{accidentalString}{patternString}");
}
}
}
public void Format_WithSuspendedSecondChordNoAdditionalTones_ShouldReturnPitchClassInUpperCaseWithAccidental(PitchClass pitchClass, Accidental accidental, string expectedValue)
{
// ARRANGE
var westernChordStringFormatter = new WesternChordStringFormatter();
var chordClass = new ChordClass(new PitchClassWithAccidental(pitchClass, accidental), TriadPattern.SuspendedSecond, ImmutableList <ChordAddedNote> .Empty);
// ACT
string actualValue = westernChordStringFormatter.Format(chordClass);
// ASSERT
actualValue.Should().Be(expectedValue);
}
public void Format_WithUnknownTriadPattern_ShouldThrowInvalidOperationException()
{
// ARRANGE
var pitchClass = PitchClass.A;
var accidental = Accidental.Natural;
var triadPattern =
(TriadPattern)typeof(TriadPattern).GetConstructors(BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.NonPublic)
.First(c => c.GetParameters().FirstOrDefault()?.ParameterType == typeof(int))
.Invoke(new object[] { -3 });
var westernChordStringFormatter = new WesternChordStringFormatter();
var chordClass = new ChordClass(new PitchClassWithAccidental(pitchClass, accidental), triadPattern, ImmutableList <ChordAddedNote> .Empty);
// ACT
Action format = () => westernChordStringFormatter.Format(chordClass);
// ASSERT
format.Should().ThrowExactly <InvalidOperationException>();
}
