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describe("basic switch tests", () => {
test("string case does not match number target", () => {
switch (1 + 2) {
case "3":
expect().fail();
case 3:
return;
case 5:
case 1:
break;
default:
break;
}
expect().fail();
});
test("string concatenation in target", () => {
var a = "foo";
switch (a + "bar") {
case 1:
expect().fail();
case "foobar":
case 2:
return;
}
expect().fail();
});
test("default", () => {
switch (100) {
default:
return;
}
expect().fail();
});
test("return from switch statement", () => {
function foo(value) {
switch (value) {
case 42:
return "return from 'case 42'";
default:
return "return from 'default'";
}
}
expect(foo(42)).toBe("return from 'case 42'");
expect(foo(43)).toBe("return from 'default'");
});
test("continue from switch statement", () => {
let i = 0;
for (; i < 5; ++i) {
switch (i) {
case 0:
continue;
expect().fail();
case 0:
expect().fail();
default:
continue;
expect().fail();
}
expect().fail();
}
expect(i).toBe(5);
});
test("default branch is not taken if more exact branch exists", () => {
function switchTest(i) {
let result = 0;
switch (i) {
case 1:
result += 1;
break;
case 1:
expect().fail();
case 2:
result += 2;
default:
result += 4;
case 3:
result += 8;
break;
case 2:
expect().fail();
}
return result;
}
expect(switchTest(1)).toBe(1);
expect(switchTest(2)).toBe(14);
expect(switchTest(3)).toBe(8);
expect(switchTest(4)).toBe(12);
});
});
describe("errors", () => {
test("syntax errors", () => {
expect("switch () {}").not.toEval();
expect("switch () { case 1: continue; }").not.toEval();
expect("switch () { case 1: break doesnotexist; }").not.toEval();
expect("label: switch () { case 1: break not_the_right_label; }").not.toEval();
expect("label: switch () { case 1: continue label; }").not.toEval();
expect("switch (foo) { bar }").not.toEval();
expect("switch (foo) { default: default: }").not.toEval();
});
});
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