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Update to React 16, handle React.Fragment better #5816

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Merged
cpojer merged 6 commits into from
Mar 18, 2018
Merged

Update to React 16, handle React.Fragment better #5816

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859e1c3
Add React.Fragment to snapshots in unhandled cases
rickhanlonii Mar 16, 2018
20d2bd2
Add test
rickhanlonii Mar 16, 2018
09adca8
Upgrade to React 16
rickhanlonii Mar 17, 2018
2418b5e
Merge remote-tracking branch 'upstream/master' into bug/fix-react-fra…
rickhanlonii Mar 17, 2018
1cc1b84
Fix flow
rickhanlonii Mar 17, 2018
b0d2888
Convert to class component
rickhanlonii Mar 18, 2018
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Add test
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@rickhanlonii
rickhanlonii committed Mar 16, 2018
commit 20d2bd25542097d410fa797dcd449732485e1351
8 changes: 8 additions & 0 deletions packages/pretty-format/src/__tests__/react.test.js
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Expand Up @@ -13,6 +13,7 @@ const React = require('react');
const renderer = require('react-test-renderer');

const elementSymbol = Symbol.for('react.element');
const fragmentSymbol = Symbol.for('react.fragment');
const testSymbol = Symbol.for('react.test.json');

const prettyFormat = require('..');
Expand Down Expand Up @@ -90,6 +91,13 @@ test('supports a single element with mixed children', () => {
);
});

test('supports a single fragment with one child', () => {
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@rickhanlonii rickhanlonii Mar 16, 2018 •
edited
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This test fails because we're on React 15:

Thoughts on updating?

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@rickhanlonii rickhanlonii Mar 16, 2018 •
edited
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The alternatives are:

  • Don't support
  • Don't test
  • Unit test just getType
  • try/catch the React throw:
test('supports a single fragment with one child', () => {
  const spy = jest.spyOn(console, 'error').mockImplementationOnce(() => {});
  try {
    assertPrintedJSX(
      React.createElement(fragmentSymbol, null, 0),
      '<React.Fragment>\n  0\n</React.Fragment>',
    );
  } catch(e) {
    if (e.message.indexOf('Element type is invalid:') === 0) {
      return;
    }

    throw e;
  }
  spy.mockRestore();
});

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@thymikee thymikee Mar 16, 2018

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We should update to latest React

assertPrintedJSX(
React.createElement(fragmentSymbol, null, 0),
'<React.Fragment>\n 0\n</React.Fragment>',
);
});

test('supports props with strings', () => {
assertPrintedJSX(
React.createElement('Mouse', {style: 'color:red'}),
Expand Down