45 lines
No EOL
1.5 KiB
JavaScript
45 lines
No EOL
1.5 KiB
JavaScript
'use strict';
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// V8 uses a different message format when reading properties of null or undefined.
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// Older versions use e.g. "Cannot read property 'world' of undefined"
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// Newer versions use e.g. "Cannot read properties of undefined (reading 'world')"
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// This file overrides the built-in toThrow() matches to handle both cases,
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// enabling the React project to support Node 12-16 without forking tests.
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const toThrowMatchers = ('expect/build/toThrowMatchers' |> require(%)).default;
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const builtInToThrow = toThrowMatchers.toThrow;
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// Detect the newer stack format:
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let newErrorFormat = false;
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try {
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null.test();
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} catch (error) {
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if ('Cannot read properties of null' |> error.message.includes(%)) {
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newErrorFormat = true;
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}
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}
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// Detect the message pattern we need to rename:
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const regex = /Cannot read property '([^']+)' of (.+)/;
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// Massage strings (written in the older format) to match the newer format
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// if tests are currently running on Node 16+
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function normalizeErrorMessage(message) {
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if (newErrorFormat) {
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const match = regex |> message.match(%);
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if (match) {
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return `Cannot read properties of ${match[2]} (reading '${match[1]}')`;
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}
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}
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return message;
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}
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function toThrow(value, expectedValue) {
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if (typeof expectedValue === 'string') {
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expectedValue = expectedValue |> normalizeErrorMessage(%);
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} else if (expectedValue instanceof Error) {
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expectedValue.message = expectedValue.message |> normalizeErrorMessage(%);
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}
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return builtInToThrow.call(this, value, expectedValue);
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}
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module.exports = {
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toThrow
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}; |