67 lines
2.0 KiB
TypeScript
67 lines
2.0 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import {
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generateProblem,
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generateSession,
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gradeAnswer,
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} from "./parenthesis-sign";
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describe("parenthesis sign problem engine", () => {
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it("generates a problem within the configured ranges", () => {
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for (let index = 0; index < 100; index += 1) {
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const problem = generateProblem();
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expect(Number.isInteger(problem.multiplier)).toBe(true);
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expect(problem.multiplier).toBeGreaterThanOrEqual(-9);
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expect(problem.multiplier).toBeLessThanOrEqual(-1);
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expect(problem.a).toBeGreaterThanOrEqual(1);
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expect(problem.a).toBeLessThanOrEqual(9);
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expect(problem.b).toBeGreaterThanOrEqual(1);
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expect(problem.b).toBeLessThanOrEqual(9);
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expect(problem.a).not.toBe(problem.b);
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expect(["+", "-"]).toContain(problem.operator);
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}
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});
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it("distributes the multiplier correctly for both operators", () => {
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for (let index = 0; index < 100; index += 1) {
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const problem = generateProblem();
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const signedB = problem.operator === "-" ? -problem.b : problem.b;
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expect(problem.distributedA).toBe(problem.multiplier * problem.a);
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expect(problem.distributedB).toBe(problem.multiplier * signedB);
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}
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});
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it("grades correct and incorrect answers", () => {
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const problem = generateProblem();
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expect(
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gradeAnswer(problem, {
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a: problem.distributedA,
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b: problem.distributedB,
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}).correct,
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).toBe(true);
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expect(
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gradeAnswer(problem, {
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a: problem.distributedB,
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b: problem.distributedA,
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}).correct,
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).toBe(false);
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});
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it("generates a session with unique problem keys", () => {
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const problems = generateSession(10);
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const keys = new Set(problems.map((problem) => problem.key));
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expect(problems).toHaveLength(10);
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expect(keys.size).toBe(10);
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});
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it("rejects impossible session sizes", () => {
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expect(() => generateSession(0)).toThrow();
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expect(() => generateSession(145)).toThrow();
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});
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});
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