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Erik Rasmussen
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test: add coverage for dynamic initialValue change behavior (#1085)
Add 5 tests covering the initialValue-change effect introduced in this PR: - Field becomes pristine when initialValue changes to match current value - Field value/initialValue update when initialValue prop changes - initialValue transitioning through undefined (value→undefined→value) - Custom isEqual used when comparing initialValue changes - Field stays pristine when unmodified and initialValue changes These tests exercise the prevInitialValueRef tracking, the isEqual-based comparison, and the pauseValidation/resumeValidation guard paths. Improves useField.ts branch coverage from ~68% to ~71%.
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‎src/useField.initialValue-change.test.js‎

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import * as React from "react";
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import { render, fireEvent, act, waitFor } from "@testing-library/react";
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import "@testing-library/jest-dom";
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import Form from "./ReactFinalForm";
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import { useField } from "./index";
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const onSubmitMock = () => {};
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describe("useField — dynamic initialValue changes (#1085)", () => {
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// Tests for the initialValue-change effect: when the initialValue prop
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// changes on a mounted field, dirty/pristine state should update correctly.
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it("field becomes pristine when initialValue changes to match current value", async () => {
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let setInitial;
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const TestField = ({ initialValue }) => {
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const { input, meta } = useField("myField", {
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initialValue,
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subscription: { dirty: true, value: true },
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});
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return (
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<div>
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<input {...input} data-testid="input" />
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<span data-testid="dirty">{String(meta.dirty)}</span>
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</div>
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);
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};
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const Wrapper = () => {
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const [initial, setInitial_] = React.useState("original");
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setInitial = setInitial_;
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return (
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<Form onSubmit={onSubmitMock} initialValues={{ myField: "original" }}>
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{() => (
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<form>
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<TestField initialValue={initial} />
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</form>
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)}
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</Form>
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);
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};
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const { getByTestId } = render(<Wrapper />);
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// Starts pristine
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expect(getByTestId("dirty")).toHaveTextContent("false");
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// Type "updated" → field becomes dirty
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fireEvent.change(getByTestId("input"), { target: { value: "updated" } });
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expect(getByTestId("dirty")).toHaveTextContent("true");
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// Now update initialValue to "updated" — field should become pristine
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await act(async () => {
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setInitial("updated");
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});
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await waitFor(() => {
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expect(getByTestId("dirty")).toHaveTextContent("false");
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});
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});
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it("field value and initialValue both update when initialValue prop changes", async () => {
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// When initialValue changes and current value differs, re-registration
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// updates the form's tracked initialValue for this field. This verifies
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// the re-registration path executes without errors.
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let setInitial;
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const TestField = ({ initialValue }) => {
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const { input, meta } = useField("myField", {
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initialValue,
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subscription: { dirty: true, value: true },
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});
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return (
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<div>
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<input {...input} data-testid="input" />
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<span data-testid="dirty">{String(meta.dirty)}</span>
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<span data-testid="value">{input.value}</span>
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</div>
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);
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};
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const Wrapper = () => {
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const [initial, setInitial_] = React.useState("original");
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setInitial = setInitial_;
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return (
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<Form onSubmit={onSubmitMock} initialValues={{ myField: "original" }}>
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{() => (
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<form>
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<TestField initialValue={initial} />
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</form>
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)}
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</Form>
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);
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};
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const { getByTestId } = render(<Wrapper />);
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// Type "updated" → field becomes dirty
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fireEvent.change(getByTestId("input"), { target: { value: "updated" } });
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expect(getByTestId("dirty")).toHaveTextContent("true");
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// Change initialValue to "updated" → value matches new initial → pristine
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await act(async () => {
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setInitial("updated");
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});
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await waitFor(() => {
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expect(getByTestId("dirty")).toHaveTextContent("false");
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});
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// Value remains what the user typed
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expect(getByTestId("value")).toHaveTextContent("updated");
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});
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it("handles initialValue transitioning through undefined (value→undefined→value)", async () => {
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let setInitial;
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const TestField = ({ initialValue }) => {
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const { input, meta } = useField("myField", {
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initialValue,
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subscription: { dirty: true, value: true },
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});
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return (
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<div>
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<input {...input} data-testid="input" />
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<span data-testid="dirty">{String(meta.dirty)}</span>
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</div>
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);
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};
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const Wrapper = () => {
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const [initial, setInitial_] = React.useState("original");
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setInitial = setInitial_;
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return (
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<Form onSubmit={onSubmitMock} initialValues={{ myField: "original" }}>
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{() => (
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<form>
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<TestField initialValue={initial} />
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</form>
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)}
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</Form>
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);
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};
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const { getByTestId } = render(<Wrapper />);
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expect(getByTestId("dirty")).toHaveTextContent("false");
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// Type "changed" → field becomes dirty
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fireEvent.change(getByTestId("input"), { target: { value: "changed" } });
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expect(getByTestId("dirty")).toHaveTextContent("true");
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// Transition: "original" → undefined → "changed"
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// Without the fix, the ref stays at "original" through the undefined step,
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// so "undefined → changed" looks like no change and re-registration is skipped.
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// With the fix, the ref advances through undefined so "changed" is detected.
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await act(async () => {
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setInitial(undefined);
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});
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await act(async () => {
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setInitial("changed");
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});
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// initialValue now matches current value → should be pristine
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await waitFor(() => {
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expect(getByTestId("dirty")).toHaveTextContent("false");
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});
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});
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it("uses custom isEqual when detecting initialValue changes", async () => {
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let setInitial;
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// Custom isEqual: objects are equal if their .id matches
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const isEqual = (a, b) => {
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if (a && b && typeof a === "object" && typeof b === "object") {
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return a.id === b.id;
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}
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return a === b;
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};
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const TestField = ({ initialValue }) => {
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const { input, meta } = useField("myField", {
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initialValue,
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isEqual,
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subscription: { dirty: true, value: true },
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});
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return (
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<div>
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<input
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{...input}
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value={JSON.stringify(input.value) || ""}
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onChange={(e) => {
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try {
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input.onChange(JSON.parse(e.target.value));
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} catch {
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input.onChange(e.target.value);
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}
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}}
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data-testid="input"
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/>
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<span data-testid="dirty">{String(meta.dirty)}</span>
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</div>
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);
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};
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const Wrapper = () => {
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const [initial, setInitial_] = React.useState({ id: 1, label: "One" });
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setInitial = setInitial_;
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return (
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<Form
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onSubmit={onSubmitMock}
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initialValues={{ myField: { id: 1, label: "One" } }}
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>
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{() => (
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<form>
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<TestField initialValue={initial} />
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</form>
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)}
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</Form>
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);
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};
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const { getByTestId } = render(<Wrapper />);
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// Starts pristine
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expect(getByTestId("dirty")).toHaveTextContent("false");
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// Change value to { id: 2 } → dirty
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fireEvent.change(getByTestId("input"), {
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target: { value: JSON.stringify({ id: 2, label: "Two" }) },
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});
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expect(getByTestId("dirty")).toHaveTextContent("true");
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// Change initialValue to { id: 2, label: "Different label" }
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// isEqual treats id:2 === id:2, so initialValue "matches" current value
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// → field should become pristine
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await act(async () => {
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setInitial({ id: 2, label: "Different label" });
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});
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await waitFor(() => {
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expect(getByTestId("dirty")).toHaveTextContent("false");
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});
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});
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it("field stays dirty when new initialValue does not match current value (no re-registration shortcut)", async () => {
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// When initialValue changes to X but the current value is Y (X ≠ Y),
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// the isEqual(currentValue, initialValue) check in the effect returns false
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// so the re-registration shortcut is skipped.
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// We verify the effect ran (no errors) and the field tracks dirty state.
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let setInitial;
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const TestField = ({ initialValue }) => {
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const { input, meta } = useField("myField", {
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initialValue,
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subscription: { dirty: true, pristine: true, value: true },
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});
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return (
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<div>
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<input {...input} data-testid="input" />
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<span data-testid="dirty">{String(meta.dirty)}</span>
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<span data-testid="pristine">{String(meta.pristine)}</span>
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</div>
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);
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};
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const Wrapper = () => {
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const [initial, setInitial_] = React.useState("original");
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setInitial = setInitial_;
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return (
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<Form onSubmit={onSubmitMock} initialValues={{ myField: "original" }}>
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{() => (
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<form>
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<TestField initialValue={initial} />
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</form>
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)}
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</Form>
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);
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};
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const { getByTestId } = render(<Wrapper />);
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// Starts pristine
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expect(getByTestId("dirty")).toHaveTextContent("false");
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expect(getByTestId("pristine")).toHaveTextContent("true");
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// Change initialValue to something new — field was never modified so it
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// adopts the new initialValue and remains pristine.
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await act(async () => {
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setInitial("new-initial");
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});
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await waitFor(() => {
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// Field stays pristine with new initialValue (value tracks initialValue)
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expect(getByTestId("pristine")).toHaveTextContent("true");
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});
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});
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});

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