public void GetUniqueNumber_NullIdsArray_NullReferenceException()
{
//Arrange
int[] idsArr = null;
var maxNumber = 999999;
//Act
//Assert
Assert.Throws <NullReferenceException>(() => NumberRandomizer.GetUniqueNumber(idsArr, maxNumber));
}
public void GetUniqueNumber_idsArrIsFull_ArgumentException()
{
//Arrange
var idsArr = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
var maxNumber = 10;
//Act
//Assert
Assert.Throws <ArgumentException>(() => NumberRandomizer.GetUniqueNumber(idsArr, maxNumber));
}
public void GetUniqueNumber_NullIdsArray_CorrectExceptionMessage()
{
//Arrange
int[] idsArr = null;
var maxNumber = 999999;
var expected = "usedNumbers cannot be null";
//Act
var actual = Record.Exception(() => NumberRandomizer.GetUniqueNumber(idsArr, maxNumber)).Message.Trim();
//Assert
Assert.Equal(expected, actual);
}
public void GetUniqueNumber_FreeNumberLastItemIn999999_Return999999()
{
//Arrange
var idsArr = Enumerable.Range(1, 999998);
var maxNumber = 999999;
var expected = 999999;
//Act
var actual = NumberRandomizer.GetUniqueNumber(idsArr, maxNumber);
//Assert
Assert.Equal(actual, expected);
}
public void GetUniqueNumber_FreeNumber2Or4and6In10ItemsArray_Return2Or4Or6()
{
//Arrange
var idsArr = new int[] { 1, 3, 5, 7, 8, 9, 10 };
var maxNumber = 10;
var expected = new int[] { 2, 4, 6 };
//Act
var actual = NumberRandomizer.GetUniqueNumber(idsArr, maxNumber);
//Assert
Assert.Contains(actual, expected);
}
public void GetUniqueNumber_FirstSpinMaxNumber1_ShouldBe1()
{
//Arrange
var idsArr = new int[] { };
var maxNumber = 1;
var expected = 1;
//Act
var actual = NumberRandomizer.GetUniqueNumber(idsArr, maxNumber);
//Assert
Assert.Equal(expected, actual);
}
public void GetUniqueNumber_idsArrIsFull_CorrectExceptionMessage()
{
//Arrange
var idsArr = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
var maxNumber = 10;
var expected = "No free numbers in this range";
//Act
var actual = Record.Exception(() => NumberRandomizer.GetUniqueNumber(idsArr, maxNumber)).Message.Trim();
//Assert
Assert.Equal(expected, actual);
}
public void GetUniqueNumber_FreeNumber4_ShouldBe4()
{
//Arrange
var idsArr = new int[] { 1, 2, 3, 5, 6, 7, 8, 9, 10 };
var maxNumber = 10;
var expected = 4;
//Act
var actual = NumberRandomizer.GetUniqueNumber(idsArr, maxNumber);
//Assert
Assert.Equal(expected, actual);
}
public void GetUniqueNumber_NegativeMaxNumber_CorrectExceptionMessage()
{
//Arrange
var idsArr = new int[] { 1, 2, 3, 5, 6, 7, 8, 9, 10 };
var maxNumber = -10;
var expected = "maxNumber cannot be less than zero";
//Act
var actual = Record.Exception(() => NumberRandomizer.GetUniqueNumber(idsArr, maxNumber)).Message.Trim();
//Assert
Assert.Equal(expected, actual);
}
