tpl: Add missing test scenario for strings.Substr

diff --git a/tpl/strings/strings_test.go b/tpl/strings/strings_test.go
index c09bfaf6709f3e3ea3206cd5cc88ac51c15daf0d..ef926aeef3354b6531f2097f36b4100f8a876697 100644 (file)
--- a/tpl/strings/strings_test.go
+++ b/tpl/strings/strings_test.go
@@ -453,6 +453,7 @@ func TestSubstr(t *testing.T) {
                {"abcdef", 2, -1, "cde"},
                {"abcdef", 4, -4, false},
                {"abcdef", 7, 1, false},
+               {"abcdef", 6, nil, false},
                {"abcdef", 1, 100, "bcdef"},
                {"abcdef", -100, 3, "abc"},
                {"abcdef", -3, -1, "de"},
@@ -486,7 +487,7 @@ func TestSubstr(t *testing.T) {
                }
 
                if b, ok := test.expect.(bool); ok && !b {
-                       c.Assert(err, qt.Not(qt.IsNil), qt.Commentf("%v", test))
+                       c.Check(err, qt.Not(qt.IsNil), qt.Commentf("%v", test))
                        continue
                }