public void ShouldFillWater_Success()
{
// Arrange
var waterTank = new WaterTank(capacity: 1000m);
// Act
waterTank.Fill(300m);
// Assert
waterTank.CurrentVolume.Should().Be(300m);
}
public void ShouldDrainWater_Success()
{
// Arrange
var waterTank = new WaterTank(capacity: 1000m);
waterTank.Fill(300m);
// Act
var drainedVolume = waterTank.Drain(100m);
// Assert
drainedVolume.Should().Be(100m);
waterTank.CurrentVolume.Should().Be(200m);
}