public void Y2015_Day19_GetMinimumSteps()
{
// Arrange
string molecule = "HOH";
List <string> replacements = new() { "e => H", "e => O", "H => HO", "H => OH", "O => HH" };
// Act
int actual = Day19.GetMinimumSteps(molecule, replacements, Logger, CancellationToken.None);
// Assert
actual.ShouldBe(3);
}