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31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
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describe("duplicated variable declarations should throw", () => {
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test("given two declarations in the same statement", () => {
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expect("let a, a;").not.toEval();
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expect("const a, a;").not.toEval();
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expect("var a, a;").toEval();
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});
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test("fail to parse if repeated over multiple statements", () => {
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expect("let a; var a;").not.toEval();
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expect("let b, a; var c, a;").not.toEval();
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expect("const a; var a;").not.toEval();
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expect("const b, a; var c, a;").not.toEval();
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});
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test.skip("should fail to parse even if variable first declared with var", () => {
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expect.skip("var a; let a;").toEval();
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expect.skip("var a; let b, a;").toEval();
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expect.skip("var a; const a;").toEval();
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expect.skip("var a; const b, a;").toEval();
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});
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test.skip("special cases with for loops", () => {
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expect("for (var a;;) { let a; }").toEval();
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expect("for (let a;;) { let a; }").toEval();
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expect("for (var a;;) { var a; }").toEval();
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expect("for (let a;;) { var a; }").not.toEval();
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});
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});
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