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Refactor Permutations in EnumerableExtensions, add PermutationsWithRepeats method, and update tests for improved validation and clarity

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This commit is contained in:
Sebastian Lindemeier
2025-12-16 07:56:20 +01:00
parent 0665713725
commit 9d4051ece1
2 changed files with 71 additions and 26 deletions
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AdventOfCode.Extensions.Tests/EnumerableExtensionsTest.cs
+29 -25
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@@ -9,9 +9,8 @@ public class EnumerableExtensionsTest
int[] data = [1, 2];
var actual = data.Combinations(2).ToArray();
Assert.Contains([1, 2], actual);
Assert.Single(actual);
Assert.Equal([[1, 2]], actual);
}
[Fact]
@@ -21,10 +20,7 @@ public class EnumerableExtensionsTest
var actual = data.Combinations(2).ToArray();
Assert.Contains([1, 2], actual);
Assert.Contains([1, 3], actual);
Assert.Contains([2, 3], actual);
Assert.Equal(3, actual.Length);
Assert.Equal([[1, 2], [1, 3], [2, 3]], actual);
}
[Fact]
@@ -33,9 +29,8 @@ public class EnumerableExtensionsTest
int[] data = [1, 2, 3];
var actual = data.Combinations(3).ToArray();
Assert.Contains([1, 2, 3], actual);
Assert.Single(actual);
Assert.Equal([[1, 2, 3]], actual);
}
[Fact]
@@ -69,33 +64,42 @@ public class EnumerableExtensionsTest
}
[Fact]
public void Permutations_12_2_equals_11_12_21_22()
public void Permutations_repeated_12_2_equals_11_12_21_22()
{
int[] data = [1, 2];
var actual = data.PermutationsWithRepeats(2).ToArray();
Assert.Equal([[1, 1], [1, 2], [2, 1], [2, 2]], actual);
}
[Fact]
public void Permutations_12_2_equals_12_21()
{
int[] data = [1, 2];
var actual = data.Permutations(2).ToArray();
Assert.Contains([1, 1], actual);
Assert.Contains([1, 2], actual);
Assert.Contains([2, 1], actual);
Assert.Contains([2, 2], actual);
Assert.Equal(4, actual.Length);
Assert.Equal([[1, 2], [2, 1]], actual);
}
[Fact]
public void Permutations_123_2_equals_11_12_13_21_22_23_31_32_33()
public void Permutations_repeated_123_2_equals_11_12_13_21_22_23_31_32_33()
{
int[] data = [1, 2, 3];
var actual = data.PermutationsWithRepeats(2).ToArray();
Assert.Equal([[1, 1], [1, 2], [1, 3], [2, 1], [2, 2], [2, 3], [3, 1], [3, 2], [3, 3]], actual);
}
[Fact]
public void Permutations_123_2_equals_12_13_21_23_31_32()
{
int[] data = [1, 2, 3];
var actual = data.Permutations(2).ToArray();
Assert.Contains([1, 1], actual);
Assert.Contains([1, 2], actual);
Assert.Contains([2, 1], actual);
Assert.Contains([2, 2], actual);
Assert.Contains([3, 1], actual);
Assert.Contains([3, 2], actual);
Assert.Contains([3, 3], actual);
Assert.Equal(9, actual.Length);
Assert.Equal([[1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2]], actual);
}
}