91 lines
2.4 KiB
TypeScript
91 lines
2.4 KiB
TypeScript
// SPDX-FileCopyrightText: 2022 Johannes Loher
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//
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// SPDX-License-Identifier: MIT
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import { describe, expect, it } from "vitest";
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import { defaultEvaluator, Evaluator, mathEvaluator } from "../../src/expression-evaluation/evaluator";
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describe("Evaluator", () => {
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it("evaluates expressions that only use identifiers according to the given predicate", () => {
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// given
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const expression = "typeof 'foo' === 'string' ? 42 : null";
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// when
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const result = defaultEvaluator.evaluate(expression);
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// then
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expect(result).toEqual(42);
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});
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it("fails to evaluate expressions that contain identifiers that are not allowed by the predicate", () => {
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// given
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const expression = "typeof 'foo' === 'string' ? 42 : function (){}";
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// when
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const evaluate = () => defaultEvaluator.evaluate(expression);
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// then
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expect(evaluate).toThrowError("'function' is not an allowed identifier.");
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});
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it("fails to evaluate expressions that contain invalid tokens", () => {
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// given
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const expression = "1;";
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// when
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const evaluate = () => defaultEvaluator.evaluate(expression);
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// then
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expect(evaluate).toThrowError("Invalid or unexpected token (1)");
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});
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it("fails to evaluate expressions that contain arrow functions", () => {
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// given
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const expression = "(() => 1)()";
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// when
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const evaluate = () => defaultEvaluator.evaluate(expression);
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// then
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expect(evaluate).toThrowError("Invalid or unexpected token (4)");
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});
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it("makes the given context available", () => {
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// given
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const context = { floor: Math.floor };
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const evaluator = new Evaluator({ context });
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const expression = "floor(0.5)";
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// when
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const result = evaluator.evaluate(expression);
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// then
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expect(result).toEqual(0);
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});
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describe("mathEvaluator", () => {
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it("makes the given context available", () => {
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// given
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const expression = "sqrt(sin(PI))";
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// when
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const result = mathEvaluator.evaluate(expression);
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// then
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expect(result).toEqual(Math.sqrt(Math.sin(Math.PI)));
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});
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it("does not give acces to the function constructor", () => {
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// given
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const expression = "sqrt.constructor";
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// when
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const evaluate = () => mathEvaluator.evaluate(expression);
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// then
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expect(evaluate).toThrowError("'constructor' is not an allowed identifier.");
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});
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});
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});
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