Test a calc reading one operand twice

calc_test.go

@@ -75,6 +75,9 @@ func TestCalcFields(t *testing.T) {
 	if got := mustRender(t, engine(1), `{"format":"{calc(a - b)}","a":{"format":"{n}","n":"10"},"b":"3"}`); got != "7" {
 		t.Fatalf("calc(a - b) = %q, want 7", got)
 	}
+	if got := mustRender(t, engine(1), `{"format":"{calc(b * (a - b))}","a":"10","b":"3"}`); got != "21" {
+		t.Fatalf("calc(b * (a - b)) = %q, want 21", got)
+	}
 }
 
 // TestCalcNonNumericIsNaN pins the never-fail rule: a field that sometimes does

internal/grammar/format_test.go

@@ -14,8 +14,8 @@ func TestSplitArgsQuotesOutsideSelectors(t *testing.T) {
 		"/geo.US.locality[O'Fallon].name, 2":      {"/geo.US.locality[O'Fallon].name", "2"},
 		"'[a,b]'":                                 {"'[a,b]'"},
 	} {
-		if got := SplitArgs(in); !reflect.DeepEqual(got, want) {
-			t.Errorf("SplitArgs(%q) = %q, want %q", in, got, want)
+		if got := splitArgs(in); !reflect.DeepEqual(got, want) {
+			t.Errorf("splitArgs(%q) = %q, want %q", in, got, want)
 		}
 	}
 }