36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
import { Value, is, preserves } from '@preserves/core';
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declare global {
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namespace jest {
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interface Matchers<R> {
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is<T>(expected: Value<T>): R;
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toThrowFilter(f: (e: Error) => boolean): R;
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}
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}
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}
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expect.extend({
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is(actual, expected) {
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return is(actual, expected)
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? { message: () => preserves`expected ${actual} not to be Preserves.is to ${expected}`,
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pass: true }
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: { message: () => preserves`expected ${actual} to be Preserves.is to ${expected}`,
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pass: false };
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},
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toThrowFilter(thunk, f) {
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try {
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thunk();
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return { message: () => preserves`expected an exception`, pass: false };
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} catch (e) {
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if (f(e)) {
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return { message: () => preserves`expected an exception not matching the filter`,
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pass: true };
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} else {
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return { message: () => preserves`expected an exception matching the filter: ${(e as any)?.constructor?.name}`,
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pass: false };
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}
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}
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}
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});
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