test: add download, store, and scraper tests

internal/download/genre_test.go

@@ -0,0 +1,51 @@
+package download
+
+import (
+	"slices"
+	"testing"
+)
+
+func TestMatchesKeyword(t *testing.T) {
+	if !matchesKeyword("Deep House", electronicKeywords) {
+		t.Error("expected Deep House to match electronic keywords")
+	}
+	if !matchesKeyword("classic rock", nonElectronicKeywords) {
+		t.Error("expected classic rock to match non-electronic keywords")
+	}
+	if matchesKeyword("Spoken Word", electronicKeywords) {
+		t.Error("did not expect Spoken Word to match electronic keywords")
+	}
+}
+
+func TestFilterTags(t *testing.T) {
+	got := filterTags([]string{"Deep House", "Rock", "Spoken Word"})
+	want := []string{"Deep House", "Rock"}
+	if !slices.Equal(got, want) {
+		t.Errorf("filterTags() = %v, want %v", got, want)
+	}
+
+	if got := filterTags([]string{"Rock", "Jazz"}); len(got) != 0 {
+		t.Errorf("filterTags() = %v, want empty", got)
+	}
+
+	if got := filterTags(nil); len(got) != 0 {
+		t.Errorf("filterTags(nil) = %v, want empty", got)
+	}
+}
+
+func TestFormatTags(t *testing.T) {
+	tests := []struct {
+		tags []string
+		want string
+	}{
+		{[]string{"deep house"}, "Deep House"},
+		{[]string{"TECHNO", "trance"}, "Techno / Trance"},
+		{[]string{" house ", ""}, "House"},
+	}
+
+	for _, tt := range tests {
+		if got := formatTags(tt.tags); got != tt.want {
+			t.Errorf("formatTags(%v) = %q, want %q", tt.tags, got, tt.want)
+		}
+	}
+}