
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

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Challenge: Filter Passing Grades

解答