diff --git a/lib/utils/tests/test-utils.cc b/lib/utils/tests/test-utils.cc
index 24642cf8..7b34aad1 100644
--- a/lib/utils/tests/test-utils.cc
+++ b/lib/utils/tests/test-utils.cc
@@ -62,9 +62,10 @@ test_date_basic()
 	}
 
 	g_setenv("TZ", hki, TRUE);
-	constexpr std::array<std::tuple<const char*, bool/*is_first*/, int64_t>, 13> cases = {{
+	std::vector<std::tuple<const char*, bool/*is_first*/, int64_t>> cases = {{
 			{"2015-09-18T09:10:23", true, 1442556623},
 			{"1972-12-14T09:10:23", true, 93165023},
+			{"1972-12-14T09:10", true,    93165000},
 			{"1854-11-18T17:10:23", true, 0},
 
 			{"2000-02-31T09:10:23", true, 951861599},
@@ -152,9 +153,11 @@ static void
 test_flatten()
 {
 	CaseVec cases = {
-	    {"Менделе́ев", true, "менделеев"},
-	    {"", false, ""},
-	    {"Ångström", true, "angstrom"},
+	    {"Менделе́ев",	true, "менделеев"},
+	    {"",		true, ""},
+	    {"Ångström",	true, "angstrom"},
+	    {"đodø",		true, "dodo"},
+
 	    // don't touch combining characters in CJK etc.
 	    {"スポンサーシップ募集",true, "スポンサーシップ募集"}
 	};
@@ -180,9 +183,10 @@ static void
 test_clean()
 {
 	CaseVec cases = {
-	    {"\t a\t\nb ", true, "a  b"},
-	    {"", false, ""},
-	    {"Ångström", true, "Ångström"},
+	    {"\t a\t\nb ",	true, "a  b"},
+	    {"",		true, ""},
+	    {"Ångström",	true, "Ångström"},
+	    {"\345\245",	true, ".."},
 	};
 
 	test_cases(cases, [](auto s, auto f) { return utf8_clean(s); });
@@ -193,9 +197,10 @@ static void
 test_word_break()
 {
 	CaseVec cases = {
-	    {"aap+noot&mies",            true,  "aap noot mies"},
-	    {"hallo",                    true,  "hallo"},
+	    {"aap+noot&mies",            true, "aap noot mies"},
+	    {"hallo",                    true, "hallo"},
 	    {"  foo-bar###cuux,fnorb  ", true, "foo bar cuux fnorb"},
+	    {"eyes\nof\tMedusa",         true, "eyes of Medusa"},
 	};
 
 	test_cases(cases, [](auto s, auto f) { return utf8_wordbreak(s); });