diff --git a/hook/hook_test.go b/hook/hook_test.go
index a799eda..7205a3b 100644
--- a/hook/hook_test.go
+++ b/hook/hook_test.go
@@ -48,6 +48,8 @@ var extractParameterTests = []struct {
 	{"a.500.b", map[string]interface{}{"a": map[string]interface{}{"b": "z"}}, "", false},                                                  // non-existent slice
 	{"a.501.b", map[string]interface{}{"a": []interface{}{map[string]interface{}{"b": "y"}, map[string]interface{}{"b": "z"}}}, "", false}, // non-existent slice index
 	{"a.502.b", map[string]interface{}{"a": []interface{}{}}, "", false},                                                                   // non-existent slice index
+	{"a.b.503", map[string]interface{}{"a": map[string]interface{}{"b": []interface{}{"x", "y", "z"}}}, "", false},                         // trailing, non-existent slice index
+	{"a.b", interface{}("a"), "", false},                                                                                                   // non-map, non-slice input
 }
 
 func TestExtractParameter(t *testing.T) {