Initial curated itworx-knowledge-hub source from 3b1751d0d9dee551aa6994eee0093704dc334817

tests/backend/ItWorx.KnowledgeHub.Domain.Tests/SortKeyTests.cs

@@ -0,0 +1,36 @@
+using ItWorx.KnowledgeHub.Domain.Knowledge;
+
+namespace ItWorx.KnowledgeHub.Domain.Tests;
+
+public sealed class SortKeyTests
+{
+    [Fact]
+    public void Next_produces_a_key_that_sorts_after_the_previous_one()
+    {
+        var first = SortKey.First();
+        var second = SortKey.Next(first);
+        var third = SortKey.Next(second);
+
+        Assert.True(string.CompareOrdinal(first.Value, second.Value) < 0);
+        Assert.True(string.CompareOrdinal(second.Value, third.Value) < 0);
+    }
+
+    [Fact]
+    public void Between_produces_a_key_strictly_between_two_others()
+    {
+        var lower = SortKey.First();
+        var upper = SortKey.Next(lower);
+        var middle = SortKey.Between(lower, upper);
+
+        Assert.True(string.CompareOrdinal(lower.Value, middle.Value) < 0);
+        Assert.True(string.CompareOrdinal(middle.Value, upper.Value) < 0);
+    }
+
+    [Fact]
+    public void All_keys_share_the_same_fixed_width_for_stable_ordinal_comparison()
+    {
+        var keys = new[] { SortKey.First(), SortKey.Next(SortKey.First()) };
+
+        Assert.All(keys, key => Assert.Equal(keys[0].Value.Length, key.Value.Length));
+    }
+}