react-native-css/src/__tests__/native/container-queries.test.tsx at e03fda7bc703acdc24b21d78d4cc77d9e3c59f8d · nativewind/react-native-css · GitHub

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import { fireEvent, render, screen } from "@testing-library/react-native";
import { View } from "react-native-css/components/View";
import { registerCSS } from "react-native-css/jest";

const parentID = "parent";
const childID = "child";

test("Unnamed containers", () => {
  registerCSS(`
    :root, :host {
      --color-white: #fff;
    }
    .\\@container {
      container-type: inline-size;
    }
    .\\@sm\\:text-white {
      @container (width >= 24rem) {
        color: var(--color-white);
      }
    }
  `);

  render(
    <View testID={parentID} className="@container">
      <View testID={childID} className="@sm:text-white" />
    </View>,
  );

  const parent = screen.getByTestId(parentID);
  const child = screen.getByTestId(childID);

  expect(child).toHaveStyle(undefined);

  // Jest does not fire layout events, so we need to manually
  fireEvent(parent, "layout", {
    nativeEvent: {
      layout: {
        width: 500,
        height: 200,
      },
    },
  });

  expect(child).toHaveStyle({ color: "#fff" });
});

test("container query width", () => {
  registerCSS(`
      .container {
        container-name: my-container;
        width: 200px;
      }

      .child {
        color: red;
      }

      @container (width > 400px) {
        .child {
          color: blue;
        }
      }
    `);

  render(
    <View testID={parentID} className="container">
      <View testID={childID} className="child" />
    </View>,
  );

  const parent = screen.getByTestId(parentID);
  const child = screen.getByTestId(childID);

  expect(parent.props.style).toStrictEqual({
    width: 200,
  });

  expect(child.props.style).toStrictEqual({
    color: "#f00",
  });

  fireEvent(parent, "layout", {
    nativeEvent: {
      layout: {
        width: 200,
        height: 200,
      },
    },
  });

  expect(child.props.style).toStrictEqual({
    color: "#f00",
  });

  screen.rerender(
    <View testID={parentID} className="container" style={{ width: 500 }}>
      <View testID={childID} className="child" />
    </View>,
  );

  fireEvent(parent, "layout", {
    nativeEvent: {
      layout: {
        width: 500,
        height: 200,
      },
    },
  });

  expect(parent.props.style).toStrictEqual([{ width: 200 }, { width: 500 }]);

  expect(child.props.style).toStrictEqual({
    color: "#00f",
  });
});