New test file for specific code section or data type

t_utils_test.go

@@ -54,6 +54,14 @@ func TestIsString(t *testing.T) {
 		succeeded++
 	}
 
+	count++
+	if isIterator("fake") {
+		t.Errorf(`%d: isIterator("fake") -> result = true, want false`, count)
+		failed++
+	} else {
+		succeeded++
+	}
+
 	count++
 	b, ok := toBool(true)
 	if !(ok && b) {
@@ -72,6 +80,15 @@ func TestIsString(t *testing.T) {
 		succeeded++
 	}
 
+	count++
+	b, ok = toBool([]int{})
+	if ok {
+		t.Errorf("%d: toBool([]) b=%v, ok=%v -> result = true, want false", count, b, ok)
+		failed++
+	} else {
+		succeeded++
+	}
+
 	t.Logf("test count: %d, succeeded count: %d, failed count: %d", count, succeeded, failed)
 }