
using Xunit;
using Xunit;
using System;
using System.IO;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "PrintNumberPyramid prints correct pyramid for 5 rows")]
        public void PrintNumberPyramid_PrintsCorrectPyramid_5Rows()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            Program.PrintNumberPyramid(5);
            string[] expected = {
                "    1",
                "   1 2",
                "  1 2 3",
                " 1 2 3 4",
                "1 2 3 4 5"
            };
            string[] output = sw.ToString().Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal(expected.Length, output.Length);
            for (int i = 0; i < expected.Length; i++)
            {
                Assert.Equal(expected[i], output[i]);
            }
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        [Fact(DisplayName = "PrintNumberPyramid prints correct pyramid for 1 row")]
        public void PrintNumberPyramid_PrintsCorrectPyramid_1Row()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            Program.PrintNumberPyramid(1);
            string output = sw.ToString().TrimEnd();
            Assert.Equal("1", output);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        [Fact(DisplayName = "PrintNumberPyramid prints correct pyramid for 3 rows")]
        public void PrintNumberPyramid_PrintsCorrectPyramid_3Rows()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            Program.PrintNumberPyramid(3);
            string[] expected = {
                "  1",
                " 1 2",
                "1 2 3"
            };
            string[] output = sw.ToString().Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal(expected.Length, output.Length);
            for (int i = 0; i < expected.Length; i++)
            {
                Assert.Equal(expected[i], output[i]);
            }
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        [Fact(DisplayName = "PrintNumberPyramid prints nothing for 0 rows")]
        public void PrintNumberPyramid_PrintsNothingForZeroRows()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            Program.PrintNumberPyramid(0);
            string output = sw.ToString();
            Assert.True(string.IsNullOrEmpty(output.Trim()), "Expected no output for 0 rows");
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
        [Fact(DisplayName = "PrintNumberPyramid prints nothing for negative rows")]
        public void PrintNumberPyramid_PrintsNothingForNegativeRows()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);
            Program.PrintNumberPyramid(-3);
            string output = sw.ToString();
            Assert.True(string.IsNullOrEmpty(output.Trim()), "Expected no output for negative rows");
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}

ProgramTests.cs

The output should look like that:
```
    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5
```

Note

Deepen your understanding of C# loops with a hands-on, challenge-driven course. Explore for, while, and do-while loops, master nested structures, generate patterns, and tackle real-world problems. Each section alternates between engaging theory and practical coding challenges to ensure you build both conceptual understanding and practical fluency.

Explore the full power of for loops in C#, from basic counting to custom steps and real-world data processing.

Master while and do-while loops for scenarios where the number of iterations isn't known in advance, and learn to control loop execution with conditions.

Delve into advanced looping techniques, including nested loops for pattern generation, loop transformations, efficiency, and avoiding common mistakes.

Challenge: Print Number Pyramid

Lösning

Challenge: Print Number Pyramid

Lösning