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test("basic eval() functionality", () => {
expect(eval("1 + 2")).toBe(3);
function foo(a) {
var x = 5;
eval("x += a");
return x;
}
expect(foo(7)).toBe(12);
});
test("returns value of last value-producing statement", () => {
// See https://tc39.es/ecma262/#sec-block-runtime-semantics-evaluation
expect(eval("")).toBeUndefined();
expect(eval("1;;;;;")).toBe(1);
expect(eval("1;{}")).toBe(1);
expect(eval("1;var a;")).toBe(1);
});
test("syntax error", () => {
expect(() => {
eval("{");
}).toThrowWithMessage(
SyntaxError,
"Unexpected token Eof. Expected CurlyClose (line: 1, column: 2)"
);
});
test("returns 1st argument unless 1st argument is a string", () => {
var stringObject = new String("1 + 2");
expect(eval(stringObject)).toBe(stringObject);
});
// These eval scope tests use function expressions due to bug #8198
var testValue = "outer";
test("eval only touches locals if direct use", function () {
var testValue = "inner";
expect(globalThis.eval("testValue")).toEqual("outer");
});
test("alias to eval works as a global eval", function () {
var testValue = "inner";
var eval1 = globalThis.eval;
expect(eval1("testValue")).toEqual("outer");
});
test("eval evaluates all args", function () {
var i = 0;
expect(eval("testValue", i++, i++, i++)).toEqual("outer");
expect(i).toEqual(3);
});
test("eval tests for exceptions", function () {
var i = 0;
expect(function () {
eval("testValue", i++, i++, j, i++);
}).toThrowWithMessage(ReferenceError, "'j' is not defined");
expect(i).toEqual(2);
});
test("direct eval inherits non-strict evaluation", function () {
expect(eval("01")).toEqual(1);
});
test("direct eval inherits strict evaluation", function () {
"use strict";
expect(() => {
eval("01");
}).toThrowWithMessage(SyntaxError, "Unprefixed octal number not allowed in strict mode");
});
test("global eval evaluates as non-strict", function () {
"use strict";
expect(globalThis.eval("01"));
});
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