feature: Trend Detection & Alert Suppression Windows

2026-06-18 21:18:13 +08:00
parent e6f7989298
commit 3c54feb38a
31 changed files with 2751 additions and 18 deletions
@@ -0,0 +1,58 @@
+using FluentAssertions;
+
+public class TrendCalculatorTests
+{
+    private static readonly DateTimeOffset BaseTime =
+        new(2026, 6, 18, 12, 0, 0, TimeSpan.Zero);
+
+    [Fact]
+    public void ComputeRatePerMinute_TwoEntries_ReturnsCorrectRate()
+    {
+        var entries = new List<TrendHistoryEntry>
+        {
+            new(72m, BaseTime),
+            new(95m, BaseTime.AddMinutes(10))
+        };
+
+        var rate = TrendCalculator.ComputeRatePerMinute(entries, windowMinutes: 30);
+
+        rate.Should().Be(2.3m);
+    }
+
+    [Fact]
+    public void ComputeRatePerMinute_SingleEntry_ReturnsNull()
+    {
+        var entries = new List<TrendHistoryEntry> { new(72m, BaseTime) };
+
+        TrendCalculator.ComputeRatePerMinute(entries, windowMinutes: 30)
+            .Should().BeNull();
+    }
+
+    [Fact]
+    public void ExceedsThreshold_HeartRateRise_ReturnsTrue()
+    {
+        TrendCalculator.ExceedsThreshold("HEART_RATE", 0.6m, 0.5m).Should().BeTrue();
+    }
+
+    [Fact]
+    public void ExceedsThreshold_Spo2Decline_ReturnsTrue()
+    {
+        TrendCalculator.ExceedsThreshold("SPO2", -0.3m, 0.2m).Should().BeTrue();
+    }
+
+    [Fact]
+    public void ExceedsThreshold_StableRate_ReturnsFalse()
+    {
+        TrendCalculator.ExceedsThreshold("HEART_RATE", 0.3m, 0.5m).Should().BeFalse();
+    }
+
+    [Fact]
+    public void DescribeTrend_FormatsCorrectly()
+    {
+        TrendCalculator.DescribeTrend("HEART_RATE", 0.77m, 95m)
+            .Should().Be("Rapid rise: HEART_RATE rising at 0.77/min (current 95)");
+
+        TrendCalculator.DescribeTrend("SPO2", -0.25m, 92m)
+            .Should().Be("Rapid decline: SPO2 falling at 0.25/min (current 92)");
+    }
+}