test-is-error.js - mozsearch

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// |jit-test| --enable-error-iserror

// Check if Error.isError is available

if (typeof Error.isError !== "function") {

    quit();

// Test non-object input should return false

assertEq(Error.isError(null), false);

assertEq(Error.isError(undefined), false);

assertEq(Error.isError(123), false);

assertEq(Error.isError("string"), false);

// Test plain objects should return false

assertEq(Error.isError({}), false);

assertEq(Error.isError(new Object()), false);

// Test various error objects should return true

assertEq(Error.isError(new Error()), true);

assertEq(Error.isError(new TypeError()), true);

assertEq(Error.isError(new RangeError()), true);

// Test cross-compartment wrapper (CCW) objects

const g = newGlobal({ newCompartment: true });

const e = g.eval(`new Error()`);

assertEq(Error.isError(e), true);

nukeCCW(e);

// Test Error.isError for the nuked CCW object

let caught = false;

try {

    Error.isError(e);

} catch (ex) {

    caught = true;

    assertEq(ex.message, "can't access dead object");

assertEq(caught, true);