48 lines
1 KiB
JavaScript
48 lines
1 KiB
JavaScript
export class AssertionError extends Error {
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constructor(message) {
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super(message)
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}
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}
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export const assert = (value, message = `assertion error: ${value} is not true`) => {
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assertEq(value, true, message)
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}
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export const assertEq = (a, b, message = `assertion error: ${a} !== ${b}`) => {
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if (a === b) {
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return
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}
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else if (Array.isArray(b) && a.length === b.length) {
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b.forEach((n, i) => assertEq(a[i], n))
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return
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} else {
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throw new AssertionError(message)
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}
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}
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export const assertCallback = () => {
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let result = false
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setTimeout(() => assert(result), 0)
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return () => result = true
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}
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export const it = (description, test) => {
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return () => {
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try {
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test()
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return {
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success: true,
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description,
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error: undefined
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}
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} catch (error) {
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return {
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success: false,
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description,
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error
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}
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}
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}
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}
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