test: Journal-shaped records in the hreflang test

TestAlternates also runs on a record shaped as the Journal descriptors
describe one: every enabled locale present, the untranslated one with
URL "" and the default locale's title, description and word count; it
answers no hreflang for that locale.

classes/alternates_test.go

@@ -54,6 +54,31 @@ func TestAlternates(t *testing.T) {
 	if got := Alternates(site, nil, "pl"); len(got) != 0 {
 		t.Fatal("no record, no alternates")
 	}
+
+	// G3: a Journal-shaped record, as the Journal descriptors describe one
+	// (P33-64): every enabled locale in sort order, the untranslated de
+	// with URL "" and the default locale's title, description and word
+	// count. de gets no hreflang.
+	words := 120
+	journalShaped := &pact.ContentRecord{Locales: []pact.ContentLocale{
+		{Locale: "pl", URL: "/blog/grzyby", Title: "Grzyby", Description: "O grzybach", Words: &words},
+		{Locale: "en", URL: "/en/blog/mushrooms", Title: "Mushrooms", Description: "About mushrooms", Words: &words},
+		{Locale: "de", URL: "", Title: "Grzyby", Description: "O grzybach", Words: &words},
+	}}
+	got = Alternates(site, journalShaped, "pl")
+	want = []Alternate{
+		{Hreflang: "pl", URL: site + "/blog/grzyby"},
+		{Hreflang: "en", URL: site + "/en/blog/mushrooms"},
+		{Hreflang: "x-default", URL: site + "/blog/grzyby"},
+	}
+	if len(got) != len(want) {
+		t.Fatalf("Journal-shaped alternates = %+v", got)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("Journal-shaped alternate %d = %+v, want %+v", i, got[i], want[i])
+		}
+	}
 }
 
 // TestOGLocale pins og:locale without configuration: the default table,