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68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
6 years ago
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"use strict";
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const expect = require("chai").expect;
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const dm = require("../src");
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describe("function guards", () => {
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it("should accept a correctly-behaving function", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number()], dm.boolean(), function (str, num) {
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expect(str).to.equal("hello world");
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expect(num).to.equal(42);
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return true;
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});
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guardedFunction("hello world", 42);
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});
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it("should throw on an invalid return value type", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number()], dm.boolean(), function (str, num) {
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return "not a boolean";
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});
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expect(() => {
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guardedFunction("hello world", 42);
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}).to.throw("Expected a boolean, got a string instead");
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});
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it("should throw on an invalid argument type", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number()], dm.boolean(), function (str, num) {
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return true;
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});
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expect(() => {
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guardedFunction(false, 42);
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}).to.throw("Expected a string, got a boolean instead");
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});
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it("should throw on a missing argument", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number()], dm.boolean(), function (str, num) {
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return true;
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});
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expect(() => {
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guardedFunction("hello world");
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}).to.throw("Value is required for property '<unknown>'");
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});
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it(" ... but not when that argument is optional", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number().optional()], dm.boolean(), function (str, num) {
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expect(str).to.equal("hello world");
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expect(num).to.equal(null);
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return true;
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});
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guardedFunction("hello world");
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});
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it("should correctly handle defaults", () => {
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let guardedFunction = dm.guard([dm.string(), dm.number().default(42)], dm.boolean(), function (str, num) {
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expect(str).to.equal("hello world");
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expect(num).to.equal(42);
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return true;
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});
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guardedFunction("hello world");
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});
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});
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