Return UNDEFINED for undefined type in ReactElement plugin (#4360)

jestjs · Aug 25, 2017 · 1938409 · 1938409
1 parent 96ba36f
commit 1938409
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/packages/pretty-format/src/__tests__/react.test.js b/packages/pretty-format/src/__tests__/react.test.js
@@ -298,7 +298,9 @@ test('supports Unknown element', () => {
   // Suppress React.createElement(undefined) console error
   const consoleError = console.error;
   (console: Object).error = jest.fn();
-  expect(formatElement(React.createElement(undefined))).toEqual('<Unknown />');
+  expect(formatElement(React.createElement(undefined))).toEqual(
+    '<UNDEFINED />',
+  );
   (console: Object).error = consoleError;
 });
 

diff --git a/packages/pretty-format/src/plugins/react_element.js b/packages/pretty-format/src/plugins/react_element.js
@@ -39,7 +39,7 @@ const getType = element => {
   if (typeof element.type === 'function') {
     return element.type.displayName || element.type.name || 'Unknown';
   }
-  return 'Unknown';
+  return 'UNDEFINED';
 };
 
 export const serialize = (