Add more test coverage around unset input source applying

altsrc/helpers_test.go

@@ -22,7 +22,10 @@ func expect(t *testing.T, a interface{}, b interface{}) {
 }
 
 func refute(t *testing.T, a interface{}, b interface{}) {
-	if a == b {
-		t.Errorf("Did not expect %v (type %v) - Got %v (type %v)", b, reflect.TypeOf(b), a, reflect.TypeOf(a))
+	_, fn, line, _ := runtime.Caller(1)
+	fn = strings.Replace(fn, wd+"/", "", -1)
+
+	if reflect.DeepEqual(a, b) {
+		t.Errorf("(%s:%d) Did not expect %v (type %v) - Got %v (type %v)", fn, line, b, reflect.TypeOf(b), a, reflect.TypeOf(a))
 	}
 }