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Serenity Operating System
1describe("duplicated variable declarations should throw", () => {
2 test("given two declarations in the same statement", () => {
3 expect("let a, a;").not.toEval();
4 expect("const a, a;").not.toEval();
5
6 expect("var a, a;").toEval();
7 });
8
9 test("fail to parse if repeated over multiple statements", () => {
10 expect("let a; var a;").not.toEval();
11 expect("let b, a; var c, a;").not.toEval();
12 expect("const a; var a;").not.toEval();
13 expect("const b, a; var c, a;").not.toEval();
14 });
15
16 test("should fail to parse even if variable first declared with var", () => {
17 expect("var a; let a;").not.toEval();
18 expect("var a; let b, a;").not.toEval();
19 expect("var a; const a;").not.toEval();
20 expect("var a; const b, a;").not.toEval();
21 });
22
23 test("special cases with for loops", () => {
24 expect("for (var a;;) { let a; }").toEval();
25 expect("for (let a;;) { let a; }").toEval();
26 expect("for (var a;;) { var a; }").toEval();
27
28 expect("for (let a;;) { var a; }").not.toEval();
29 });
30});