public void GetSteps_Should_Get_Correct_Steps_When_Heigth_Is_Largest_And_Only_1_Step_Is_Needed()
{
// Arrange
var calc = new StepCalculator(75);
var start = new Size(1024, 1280);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be(2);
result[0].Should().Be(new Size(1024, 1280));
result[1].Should().Be(new Size(512, 640));
}
public void GetSteps_Should_Get_Correct_Steps_When_Heigth_Is_Largest()
{
// Arrange
var calc = new StepCalculator(25);
var start = new Size(768, 1024);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be(3);
result[0].Should().Be(new Size(768, 1024));
result[1].Should().Be(new Size(576, 768));
result[2].Should().Be(new Size(480, 640));
}
public void GetSteps_Should_Get_Correct_Steps()
{
// Arrange
var calc = new StepCalculator(20);
var start = new Size(5000, 3750);
// Act
var result = calc.GetSteps(start, 2048);
// Assert
result.Count.Should().Be(5);
result[0].Should().Be(new Size(5000, 3750));
result[1].Should().Be(new Size(4000, 3000));
result[2].Should().Be(new Size(3200, 2400));
result[3].Should().Be(new Size(2560, 1920));
result[4].Should().Be(new Size(2048, 1536));
}
public void GetSteps_Should_Get_Correct_Steps_When_Many_Steps_Are_Needed()
{
// Arrange
var calc = new StepCalculator(1);
var start = new Size(1024, 768);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be(48);
result[0].Should().Be(new Size(1024, 768));
result[1].Should().Be(new Size(1014, 760));
result[2].Should().Be(new Size(1004, 753));
result[3].Should().Be(new Size(994, 745));
result[4].Should().Be(new Size(984, 738));
result[5].Should().Be(new Size(974, 730));
result[6].Should().Be(new Size(964, 723));
result[7].Should().Be(new Size(954, 716));
result[8].Should().Be(new Size(945, 709));
result[9].Should().Be(new Size(935, 702));
result[10].Should().Be(new Size(926, 695));
result[11].Should().Be(new Size(917, 688));
result[12].Should().Be(new Size(908, 681));
result[13].Should().Be(new Size(899, 674));
result[14].Should().Be(new Size(890, 667));
result[15].Should().Be(new Size(881, 661));
result[16].Should().Be(new Size(872, 654));
result[17].Should().Be(new Size(863, 647));
result[18].Should().Be(new Size(855, 641));
result[19].Should().Be(new Size(846, 634));
result[20].Should().Be(new Size(838, 628));
result[21].Should().Be(new Size(829, 622));
result[22].Should().Be(new Size(821, 616));
result[23].Should().Be(new Size(813, 609));
result[24].Should().Be(new Size(805, 603));
result[25].Should().Be(new Size(796, 597));
result[26].Should().Be(new Size(789, 591));
result[27].Should().Be(new Size(781, 585));
result[28].Should().Be(new Size(773, 580));
result[29].Should().Be(new Size(765, 574));
result[30].Should().Be(new Size(757, 568));
result[31].Should().Be(new Size(750, 562));
result[32].Should().Be(new Size(742, 557));
result[33].Should().Be(new Size(735, 551));
result[34].Should().Be(new Size(728, 546));
result[35].Should().Be(new Size(720, 540));
result[36].Should().Be(new Size(713, 535));
result[37].Should().Be(new Size(706, 529));
result[38].Should().Be(new Size(699, 524));
result[39].Should().Be(new Size(692, 519));
result[40].Should().Be(new Size(685, 514));
result[41].Should().Be(new Size(678, 509));
result[42].Should().Be(new Size(671, 504));
result[43].Should().Be(new Size(665, 499));
result[44].Should().Be(new Size(658, 494));
result[45].Should().Be(new Size(651, 489));
result[46].Should().Be(new Size(645, 484));
result[47].Should().Be(new Size(640, 480));
}
public void GetSteps_Should_Use_Supplied_Step_Percentage()
{
// Arrange
const int stepPercentage = 24;
var calc = new StepCalculator(stepPercentage);
var start = new Size(1024, 768);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be(3);
result[0].Should().Be(new Size(1024, 768));
result[1].Should().Be(new Size(778, 584));
((double)result[1].Width / (double)result[0].Width).Should().Be.RoughlyEqualTo((100 - stepPercentage) / 100.0, 0.0005);
}
public void GetSteps_Should_Use_Default_Step_Percentage_If_Supplied_Percentage_Is_Zero()
{
// Arrange
var calc = new StepCalculator(0);
var start = new Size(1024, 768);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be(4);
result[0].Should().Be(new Size(1024, 768));
result[1].Should().Be(new Size(819, 614));
((double)result[1].Width / (double)result[0].Width).Should().Be.RoughlyEqualTo((100 - StepCalculator.DefaultStepPercentage) / 100.0, 0.0005);
}
public void GetSteps_Should_Stop_When_Max_Steps_Is_Reached()
{
// Arrange
var calc = new StepCalculator(1);
var start = new Size(2048, 1536);
// Act
var result = calc.GetSteps(start, 4);
// Assert
result.Count.Should().Be(StepCalculator.MaxSteps);
result.Last().Should().Be(new Size(4, 3));
}
public void GetSteps_Should_Return_Start_Size_As_The_First_Result()
{
// Arrange
var calc = new StepCalculator(25);
var start = new Size(2048, 1536);
// Act
var result = calc.GetSteps(start, 640);
// Assert
result.Count.Should().Be.GreaterThan(1);
result.First().Should().Be(start);
}
public void GetSteps_Should_Return_Only_Start_Size_When_Width_Is_Smaller_Than_Goal()
{
// Arrange
var calc = new StepCalculator(25);
var start = new Size(1024, 768);
// Act
var result = calc.GetSteps(start, 1025);
// Assert
result.Count.Should().Be(1);
result[0].Should().Be(new Size(1024, 768));
}
public void GetSteps_Should_Return_Only_Start_Size_When_Height_Equals_Goal()
{
// Arrange
var calc = new StepCalculator(25);
var start = new Size(768, 1024);
// Act
var result = calc.GetSteps(start, 1024);
// Assert
result.Count.Should().Be(1);
result[0].Should().Be(new Size(768, 1024));
}
public void GetSteps_Should_Return_1_Step_When_Step_Percentage_Is_Greater_Than_100()
{
// Arrange
var calc = new StepCalculator(110);
var start = new Size(3000, 2000);
// Act
var result = calc.GetSteps(start, 12);
// Assert
result.Count.Should().Be(2);
result[0].Should().Be(new Size(3000, 2000));
result[1].Should().Be(new Size(12, 8));
}
public void GetSteps_Should_Get_Correct_Steps_When_Width_And_Height_Differs_Greatly()
{
// Arrange
var calc = new StepCalculator(20);
var start = new Size(3400, 100);
// Act
var result = calc.GetSteps(start, 2048);
// Assert
result.Count.Should().Be(4);
result[0].Should().Be(new Size(3400, 100));
result[1].Should().Be(new Size(2720, 80));
result[2].Should().Be(new Size(2176, 64));
result[3].Should().Be(new Size(2048, 60));
}