Publish current app and server

server/internal/recommend/context_test.go

@@ -0,0 +1,82 @@
+package recommend
+
+import (
+	"testing"
+	"time"
+)
+
+func TestContextAffinityPrefersTypicalWeekdayTime(t *testing.T) {
+	location := time.FixedZone("test", 12*60*60)
+	profile := NewContextAffinityProfile()
+	comedy := Item{Genres: []string{"Comedy"}}
+	drama := Item{Genres: []string{"Drama"}}
+	for i := 0; i < 6; i++ {
+		profile.Add(
+			comedy,
+			time.Date(2026, 7, 6+i*7, 19, 30, 0, 0, location),
+			1,
+			i,
+			location,
+		)
+		profile.Add(
+			drama,
+			time.Date(2026, 7, 7+i*7, 13, 0, 0, 0, location),
+			1,
+			i,
+			location,
+		)
+	}
+
+	now := time.Date(2026, 7, 27, 20, 0, 0, 0, location) // Monday evening.
+	comedyScore, confidence := profile.Score(comedy, now, location)
+	dramaScore, _ := profile.Score(drama, now, location)
+	if comedyScore <= dramaScore {
+		t.Fatalf("Monday-evening comedy score %.3f <= drama score %.3f", comedyScore, dramaScore)
+	}
+	if confidence != 1 {
+		t.Fatalf("confidence = %.3f, want 1 after repeated matching sessions", confidence)
+	}
+}
+
+func TestContextAffinityUsesNeighboringWindowsAsWeakFallback(t *testing.T) {
+	location := time.UTC
+	profile := NewContextAffinityProfile()
+	item := Item{Genres: []string{"Documentary"}}
+	profile.Add(
+		item,
+		time.Date(2026, 7, 20, 16, 30, 0, 0, location), // Monday afternoon.
+		0.8,
+		0,
+		location,
+	)
+
+	exact, exactConfidence := profile.Score(
+		item, time.Date(2026, 7, 27, 16, 0, 0, 0, location), location,
+	)
+	neighbor, neighborConfidence := profile.Score(
+		item, time.Date(2026, 7, 27, 18, 0, 0, 0, location), location,
+	)
+	if neighbor <= 0 || neighbor*neighborConfidence >= exact*exactConfidence {
+		t.Fatalf(
+			"weighted neighbor %.3f should be positive and below exact %.3f",
+			neighbor*neighborConfidence,
+			exact*exactConfidence,
+		)
+	}
+	if neighborConfidence >= exactConfidence {
+		t.Fatalf(
+			"neighbor confidence %.3f should be below exact %.3f",
+			neighborConfidence,
+			exactConfidence,
+		)
+	}
+}
+
+func TestContextAffinityHasNeutralSparseHistoryFallback(t *testing.T) {
+	score, confidence := (ContextAffinityProfile{}).Score(
+		Item{Genres: []string{"Drama"}}, time.Now(), time.UTC,
+	)
+	if score != 0 || confidence != 0 {
+		t.Fatalf("empty profile = score %.3f confidence %.3f, want neutral", score, confidence)
+	}
+}