优化排课

2026-07-24 19:35:49 +08:00
parent 6538b6080a
commit e6d8eb0662
17 changed files with 4073 additions and 6 deletions
@@ -0,0 +1,47 @@
+using Jiaowu.Api.Infrastructure.Teaching;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class PublicCourseTaskAssignmentPlannerTests
+{
+    [Fact]
+    public void Assignments_are_randomized_among_least_loaded_eligible_teachers()
+    {
+        var first = Guid.NewGuid();
+        var second = Guid.NewGuid();
+        var third = Guid.NewGuid();
+        var assignments = PublicCourseTaskAssignmentPlanner.AssignTeachers(
+            [first, second, third],
+            new Dictionary<Guid, int>
+            {
+                [first] = 2,
+                [second] = 0,
+                [third] = 0
+            },
+            6,
+            new Random(42));
+
+        Assert.Equal(6, assignments.Count);
+        Assert.All(assignments, teacherId =>
+            Assert.Contains(teacherId, new[] { first, second, third }));
+        var finalLoads = new Dictionary<Guid, int>
+        {
+            [first] = 2,
+            [second] = 0,
+            [third] = 0
+        };
+        foreach (var teacherId in assignments) finalLoads[teacherId]++;
+        Assert.True(finalLoads.Values.Max() - finalLoads.Values.Min() <= 1);
+    }
+
+    [Fact]
+    public void Assignment_requires_at_least_one_eligible_teacher()
+    {
+        Assert.Throws<ArgumentException>(() =>
+            PublicCourseTaskAssignmentPlanner.AssignTeachers(
+                [],
+                new Dictionary<Guid, int>(),
+                1,
+                new Random(1)));
+    }
+}