
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Returns only passing grades (>=60) from mixed scores array")] 
        public void FilterPassingGrades_ReturnsOnlyPassingGrades() 
        {
            int[] scores = { 45, 88, 59, 72, 95, 60, 38 };
            int[] expected = { 88, 72, 95, 60 };
            int[] result = Program.FilterPassingGrades(scores);
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "Preserves order of passing grades from original array")]
        public void FilterPassingGrades_PreservesOrder()
        {
            int[] scores = { 61, 75, 60, 99 };
            int[] expected = { 61, 75, 60, 99 };
            int[] result = Program.FilterPassingGrades(scores);
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "Returns empty array when no passing grades present")]
        public void FilterPassingGrades_ReturnsEmptyArrayIfNonePassing()
        {
            int[] scores = { 10, 20, 59, 0 };
            int[] result = Program.FilterPassingGrades(scores);
            Assert.Empty(result);
        }

        [Fact(DisplayName = "Handles array with all passing grades correctly")]
        public void FilterPassingGrades_AllPassingGrades()
        {
            int[] scores = { 60, 70, 80 };
            int[] expected = { 60, 70, 80 };
            int[] result = Program.FilterPassingGrades(scores);
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "Handles empty array input")]
        public void FilterPassingGrades_EmptyInput()
        {
            int[] scores = { };
            int[] result = Program.FilterPassingGrades(scores);
            Assert.Empty(result);
        }
    }
}

ProgramTests.cs

Master the essentials and advanced techniques of working with arrays in C#. This course guides you from the basics of declaring and initializing arrays, through practical manipulation, searching, and advanced operations like sorting and matrix calculations. Each section blends engaging theory with real-world themed challenges to ensure a hands-on, beginner-friendly learning experience.

Challenge: Filter Passing Grades

Solution