Created
February 22, 2024 18:48
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A mental exercise in testing all the permutations of a single line which I didn't complete
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| export interface ITestCaseSubject { | |
| subject: string; | |
| } | |
| export interface IEachTestCase extends ITestCaseSubject { | |
| each: Array<() => any>; | |
| } | |
| export type ArrayMoreThanOne<T> = [T, T, ...T[]]; | |
| export function testPermutations(subjectCases: ArrayMoreThanOne<IEachTestCase>) { | |
| function traverseAll( | |
| fn: (subject: string, permutation: () => string, subjectIndex: number, permutationIndex: number) => void, | |
| ): void { | |
| for (let subjectIndex = 0; subjectIndex < subjectCases.length; subjectIndex++) { | |
| const subjectCase = subjectCases[subjectIndex]; | |
| const permutations = subjectCase.each; | |
| for (let permutationIndex = 0; permutationIndex < permutations.length; permutationIndex++) { | |
| fn(subjectCase.subject, permutations[permutationIndex], subjectIndex, permutationIndex); | |
| } | |
| } | |
| } | |
| function traverseAllBut( | |
| skipSubjectIndex: number, | |
| skipPermutationIndex: number, | |
| fn: (subject: string, permutation: () => string, subjectIndex: number, permutationIndex: number) => void, | |
| ): void { | |
| for (let subjectIndex = 0; subjectIndex < subjectCases.length; subjectIndex++) { | |
| if (subjectIndex === skipSubjectIndex) continue; | |
| const subjectCase = subjectCases[subjectIndex]; | |
| const permutations = subjectCase.each; | |
| for (let permutationIndex = 0; permutationIndex < permutations.length; permutationIndex++) { | |
| if (permutationIndex === skipPermutationIndex) continue; | |
| fn(subjectCase.subject, permutations[permutationIndex], subjectIndex, permutationIndex); | |
| } | |
| } | |
| } | |
| return (runTest: () => void | Promise<void>) => { | |
| let whenDescription: string[]; | |
| beforeEach(() => { | |
| whenDescription = []; | |
| traverseAll((subject, permutation, subjectIndex, permutationIndex) => { | |
| traverseAllBut(subjectIndex, permutationIndex, (relatedSubject, relatedPermutation) => { | |
| whenDescription.push(`${relatedSubject} = ${JSON.stringify(relatedPermutation())}`); | |
| }); | |
| }); | |
| }); | |
| // describe(`when ${whenDescription.join(", ")} and ${subject} = ${JSON.stringify(permutation())}`, () => { | |
| // beforeEach(permutation); | |
| // runTest(); | |
| // // it("returns true", async () => { | |
| // // expect(await runTest()).toBe(true); | |
| // // }); | |
| // }); | |
| }; | |
| } |
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