feat(learning): make practice scoring authoritative

Tiku.UnitTests/Learning/QuestionGraderTests.cs

@@ -0,0 +1,81 @@
+using System.Text.Json;
+using Tiku.Application.Learning;
+using Tiku.Domain.Common;
+using Tiku.Domain.Learning;
+
+namespace Tiku.UnitTests.Learning;
+
+public sealed class QuestionGraderTests
+{
+    [Fact]
+    public void Choice_requires_exactly_one_matching_index()
+    {
+        var result = Grade("choice", correctIndex: 1, selected: [1]);
+
+        Assert.Equal(AnswerGradingStatus.Correct, result.Status);
+        Assert.True(result.IsCorrect);
+        Assert.Equal(5, result.AwardedScore);
+    }
+
+    [Fact]
+    public void Multiple_choice_compares_deduplicated_unordered_sets()
+    {
+        var result = Grade(
+            "multiple_choice",
+            correctIndices: JsonSerializer.SerializeToElement(new[] { 2, 0 }),
+            selected: [0, 2, 2]);
+
+        Assert.Equal(AnswerGradingStatus.Correct, result.Status);
+    }
+
+    [Theory]
+    [InlineData("对", "true")]
+    [InlineData("false", "错")]
+    public void True_false_normalizes_supported_boolean_values(string expected, string actual)
+    {
+        var result = Grade("true_false", correctText: expected, answerText: actual);
+
+        Assert.Equal(AnswerGradingStatus.Correct, result.Status);
+    }
+
+    [Fact]
+    public void Fill_blank_normalizes_unicode_case_and_whitespace()
+    {
+        var rules = JsonSerializer.SerializeToElement(new { acceptedAnswers = new[] { "Entity Framework" } });
+
+        var result = Grade("fill_blank", correctText: "EF Core", answerText: "  ENTITY   FRAMEWORK ", rules: rules);
+
+        Assert.Equal(AnswerGradingStatus.Correct, result.Status);
+    }
+
+    [Theory]
+    [InlineData("short_answer")]
+    [InlineData("reading")]
+    [InlineData("programming")]
+    public void Subjective_questions_remain_pending_review(string type)
+    {
+        var result = Grade(type, answerText: "student answer");
+
+        Assert.Equal(AnswerGradingStatus.PendingReview, result.Status);
+        Assert.Null(result.IsCorrect);
+        Assert.Null(result.AwardedScore);
+    }
+
+    private static QuestionGradingResult Grade(
+        string type,
+        int? correctIndex = null,
+        JsonElement? correctIndices = null,
+        string? correctText = null,
+        IReadOnlyCollection<int>? selected = null,
+        string? answerText = null,
+        JsonElement? rules = null) =>
+        QuestionGrader.Grade(new QuestionGradingInput(
+            type,
+            correctIndex,
+            correctIndices ?? JsonDefaults.Array(),
+            correctText,
+            rules ?? JsonDefaults.Object(),
+            selected,
+            answerText,
+            5));
+}