0.2.81

2026-08-20 07:54:03 +12:00
parent 769fe01c84
commit 434371e9cf
37 changed files with 1767 additions and 102 deletions
@@ -0,0 +1,76 @@
+package api
+
+import (
+	"testing"
+
+	"github.com/ponzischeme89/memby/server/internal/store"
+)
+
+func TestNormaliseGenreAffinityScalesToTheTopGenre(t *testing.T) {
+	response := normaliseGenreAffinity(store.GenreAffinity{
+		Sessions: 40,
+		Genres: []store.GenreWeight{
+			{Genre: "Crime", Score: 20},
+			{Genre: "Drama", Score: 10},
+			{Genre: "Western", Score: 1},
+		},
+	})
+	if response.Sessions != 40 {
+		t.Fatalf("sessions = %d, want 40", response.Sessions)
+	}
+	if len(response.Genres) != 3 {
+		t.Fatalf("genres = %d, want 3", len(response.Genres))
+	}
+	if response.Genres[0].Genre != "Crime" || response.Genres[0].Weight != 1 {
+		t.Fatalf("top = %+v, want Crime at 1", response.Genres[0])
+	}
+	if response.Genres[1].Weight != 0.5 {
+		t.Fatalf("Drama = %v, want 0.5", response.Genres[1].Weight)
+	}
+}
+
+// A share is the whole point: two households with wildly different amounts of viewing must
+// produce the same ordering from the same balance of it.
+func TestNormaliseGenreAffinityIsScaleFree(t *testing.T) {
+	light := normaliseGenreAffinity(store.GenreAffinity{Sessions: 12, Genres: []store.GenreWeight{
+		{Genre: "Comedy", Score: 3}, {Genre: "Horror", Score: 1},
+	}})
+	heavy := normaliseGenreAffinity(store.GenreAffinity{Sessions: 900, Genres: []store.GenreWeight{
+		{Genre: "Comedy", Score: 300}, {Genre: "Horror", Score: 100},
+	}})
+	for i := range light.Genres {
+		if light.Genres[i] != heavy.Genres[i] {
+			t.Fatalf("entry %d: %+v vs %+v", i, light.Genres[i], heavy.Genres[i])
+		}
+	}
+}
+
+// An empty or nonsensical reading has to come back as an empty *list* rather than as null,
+// because the television reads "no genres" as "use the default order" and a null would be
+// one more shape for it to have an opinion about.
+func TestNormaliseGenreAffinityRefusesToInventWeights(t *testing.T) {
+	for name, affinity := range map[string]store.GenreAffinity{
+		"nothing watched": {},
+		"all zero":        {Sessions: 5, Genres: []store.GenreWeight{{Genre: "Drama"}}},
+		"negative":        {Sessions: 5, Genres: []store.GenreWeight{{Genre: "Drama", Score: -2}}},
+	} {
+		response := normaliseGenreAffinity(affinity)
+		if response.Genres == nil {
+			t.Fatalf("%s: genres is nil, want an empty list", name)
+		}
+		if len(response.Genres) != 0 {
+			t.Fatalf("%s: genres = %+v, want none", name, response.Genres)
+		}
+	}
+}
+
+// A blank label cannot be matched against anything on the television, so it is dropped
+// rather than sent as a row with a weight the set would have to know to ignore.
+func TestNormaliseGenreAffinityDropsBlankLabels(t *testing.T) {
+	response := normaliseGenreAffinity(store.GenreAffinity{Sessions: 20, Genres: []store.GenreWeight{
+		{Genre: "Drama", Score: 4}, {Genre: "", Score: 2},
+	}})
+	if len(response.Genres) != 1 || response.Genres[0].Genre != "Drama" {
+		t.Fatalf("genres = %+v, want Drama alone", response.Genres)
+	}
+}