public void NewEmptyBookHasNoGrades()
{
// arrange / act
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// assert
Assert.False(book.HasGrades);
}
public void CannotAddInvalidLetterGrade()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// act / assert
Assert.Throws <ArgumentException>(() => book.AddGrade('L'));
Assert.False(book.HasGrades);
}
public void CannotAddOutside0To100()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// act / assert
Assert.Throws <ArgumentException>(() => book.AddGrade(-1));
Assert.Throws <ArgumentException>(() => book.AddGrade(100.0001));
Assert.False(book.HasGrades);
}
public void ExistingBookFileTest()
{
// arrange
File.Delete(FileName);
File.WriteAllText(FileName, "44 55 66 B A 77");
// act
var book = new FileSystemBook(BookName);
// assert
Assert.True(book.HasGrades);
}
public void AddingValidGradeMakesHasGradesTrue()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// act
book.AddGrade(12);
// assert
Assert.True(book.HasGrades);
}
public void AddGradeRaisesGradeAddedEvent()
{
// arrange
var book = new FileSystemBook(BookName);
book.GradeAdded += GradeAdded;
_gradeAddedEventCounter = 0;
// act
book.AddGrade(1);
// assert
Assert.Equal(1, _gradeAddedEventCounter);
}
public void AddingManyGradesAddsToFile()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// act
book.AddGrade(20);
book.AddGrade(30);
// assert
var fileContent = File.ReadAllText(FileName);
Assert.Equal("20 30", fileContent);
}
public void AddingOneGradeAddsToFile()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
// act
book.AddGrade(10);
// assert
var fileContent = File.ReadAllText(FileName);
var grade = double.Parse(fileContent);
Assert.Equal(10, grade);
}
public void CanComputeStatistics()
{
// arrange
File.Delete(FileName);
var book = new FileSystemBook(BookName);
book.AddGrade(56.2);
book.AddGrade(70.4);
book.AddGrade(42.1);
// act
var stats = book.ComputeStatistics();
// assert
Assert.Equal(56.23, stats.Average, 2);
Assert.Equal(42.1, stats.Low);
Assert.Equal(70.4, stats.High);
Assert.Equal('F', stats.Letter);
}
