47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
describe("correct behavior", () => {
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test("iterate through array", () => {
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const a = [];
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for (const num of [1, 2, 3]) {
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a.push(num);
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}
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expect(a).toEqual([1, 2, 3]);
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});
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test("iterate through string", () => {
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const a = [];
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for (const char of "hello") {
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a.push(char);
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}
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expect(a).toEqual(["h", "e", "l", "l", "o"]);
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});
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test("iterate through string object", () => {
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const a = [];
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for (const char of new String("hello")) {
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a.push(char);
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}
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expect(a).toEqual(["h", "e", "l", "l", "o"]);
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});
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test("use already-declared variable", () => {
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var char;
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for (char of "abc");
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expect(char).toBe("c");
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});
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});
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describe("errors", () => {
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test("right hand side is a primitive", () => {
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expect(() => {
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for (const _ of 123) {
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}
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}).toThrowWithMessage(TypeError, "for..of right-hand side must be iterable");
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});
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test("right hand side is an object", () => {
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expect(() => {
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for (const _ of { foo: 1, bar: 2 }) {
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}
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}).toThrowWithMessage(TypeError, "for..of right-hand side must be iterable");
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});
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});
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