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2026-08-10 19:23:04 +02:00
commit 404d15a56c
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+using AfterHours.Economy;
+using NUnit.Framework;
+
+namespace AfterHours.Tests
+{
+    public sealed class PricingServiceTests
+    {
+        [Test]
+        public void AtOrBelowRecommendedPrice_EveryoneBuys()
+        {
+            Assert.AreEqual(1f, PricingService.PurchaseProbability(10f, 12f), 0.0001f);
+            Assert.AreEqual(1f, PricingService.PurchaseProbability(12f, 12f), 0.0001f);
+        }
+
+        [Test]
+        public void AtRejectionThreshold_NobodyBuys()
+        {
+            float price = 12f * PricingService.RejectionThreshold;
+            Assert.AreEqual(0f, PricingService.PurchaseProbability(price, 12f), 0.0001f);
+        }
+
+        [Test]
+        public void DemandFallsMonotonically()
+        {
+            float previous = 1f;
+            for (float price = 12f; price < 21f; price += 0.5f)
+            {
+                float current = PricingService.PurchaseProbability(price, 12f);
+                Assert.LessOrEqual(current, previous);
+                previous = current;
+            }
+        }
+
+        [Test]
+        public void SmallMarkupHurtsLessThanLargeOne()
+        {
+            float small = 1f - PricingService.PurchaseProbability(13f, 12f);
+            float large = 1f - PricingService.PurchaseProbability(19f, 12f);
+            Assert.Less(small, large * 0.5f);
+        }
+
+        [Test]
+        public void ExpectedProfitPeaksAboveWholesale()
+        {
+            float best = 0f, bestPrice = 0f;
+            for (float price = 5f; price < 21f; price += 0.25f)
+            {
+                float profit = PricingService.ExpectedProfitPerUnit(price, 12f, 5f);
+                if (profit > best) { best = profit; bestPrice = price; }
+            }
+            Assert.Greater(bestPrice, 5f);
+            Assert.Greater(best, 0f);
+        }
+    }
+}